Audited Consolidated Financial Statements

(In US dollars)

HUDBAY MINERALS INC.

Years ended December 31, 2023 and 2022

MANAGEMENT'S REPORT ON INTERNAL CONTROL OVER FINANCIAL REPORTING

Management of Hudbay Minerals Inc. ("Hudbay" or the "Company") is responsible for establishing and maintaining internal control over financial reporting ("ICFR").

Under the supervision of and with the participation of the Chief Executive Officer and the Chief Financial Officer, Hudbay's management assessed the effectiveness of the Company's ICFR as of December 31, 2023 based upon the Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on this evaluation, management concluded that Hudbay's ICFR was effective as of December 31, 2023.

On June 20, 2023 the Company acquired Copper Mountain Mining Corporation ("Copper Mountain"). As permitted by SEC staff interpretive guidance for newly acquired businesses, management has excluded Copper Mountain from its assessment of the effectiveness of the Company's internal control over financial reporting. Copper Mountain's financial statements constitute 34% and 19% of net and total assets, respectively, 10% of revenues, and 19% of net income of the consolidated financial statement amounts as of and for the year ended December 31, 2023.

The effectiveness of the Company's ICFR as of December 31, 2023 has been audited by Deloitte LLP, Independent Registered Public Accounting Firm, as stated in their report immediately preceding the Company's audited consolidated financial statements for the year ended December 31, 2023.
 

Toronto, Canada

February 22, 2024

Report of Independent Registered Public Accounting Firm

To the shareholders and the Board of Directors of Hudbay Minerals Inc.

Opinion on the Financial Statements

We have audited the accompanying consolidated balance sheets of Hudbay Minerals Inc. and subsidiaries (the "Company") as of December 31, 2023 and 2022, the related consolidated income statements, consolidated statements of comprehensive income, changes in equity, and cash flows, for each of the two years in the period ended December 31, 2023, and the related notes (collectively referred to as the "financial statements"). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2023 and 2022, and its financial performance and its cash flows for each of the two years in the period ended December 31, 2023, in accordance with International Financial Reporting Standards as issued by the International Accounting Standards Board.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company's internal control over financial reporting as of December 31, 2023, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission and our report dated February 22, 2024, expressed an unqualified opinion on the Company's internal control over financial reporting.

Basis for Opinion

These financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion on the Company's financial statements based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.

Critical Audit Matters

The critical audit matters communicated below are matters arising from the current-period audit of the financial statements that were communicated or required to be communicated to the audit committee and that (1) relate to accounts or disclosures that are material to the financial statements and (2) involved our especially challenging, subjective, or complex judgments. The communication of critical audit matters does not alter in any way our opinion on the financial statements, taken as a whole, and we are not, by communicating the critical audit matters below, providing separate opinions on the critical audit matters or on the accounts or disclosures to which they relate.

Impairment - Assessment of Whether Indicators of Impairment or Impairment Reversal Exist in Non-financial Assets - Refer to Notes 2d and 3i to the financial statements

Critical Audit Matter Description

The Company's determination of whether an indicator of impairment or impairment reversal exists in non-financial assets at the cash generating unit ("CGU") level requires significant management judgment. 

While there are several inputs that are required to determine whether or not an indicator of impairment or impairment reversal exists, the judgments with the highest degree of subjectivity are the future long-term copper price, inputs to the market capitalization deficiency assessment (specifically control premiums, industry specific factors and company performance), and the discount rate.  Auditing these estimates and inputs required a high degree of subjectivity in applying audit procedures and in evaluating the results of those procedures.  This resulted in an increased extent of audit effort, including the involvement of fair value specialists.

How the Critical Audit Matter Was Addressed in the Audit

Our audit procedures related to the future long-term copper price, inputs to the market capitalization deficiency assessment (specifically control premiums, industry specific factors and company performance), and the discount rate in the assessment of indicators of impairment or impairment reversal included the following, among others:

• Evaluated the effectiveness of controls over management's assessment of the indicators of impairment or impairment reversal.

• With the assistance of fair value specialists:

- Evaluated the future long-term copper price by comparing management forecasts to third party forecasts,

- Performed an assessment of the market capitalization deficiency to the carrying value of the CGUs which included: assessing control premiums, industry specific factors, company performance, and

- Evaluated the reasonableness of the discount rate by comparing the key inputs to independent market data.

Impairment - Identification of Impairment Indicator within Peru CGU - Refer to Notes 2d, 3i, and 14 to the financial statements

Critical Audit Matter Description

The Company's determination of whether an indicator of impairment or impairment reversal exists in non-financial assets at the CGU level requires significant management judgment. An impairment loss is recognized if the carrying amount of the CGU exceeds its recoverable amount.  The recoverable amount of the CGU is estimated based on the higher of its fair value less cost of disposal and its value in use.  An impairment indicator was identified at the Peru CGU as a result of a new life of mine plan for Peru, which included updated costs reflecting recently experienced inflationary pressures.  The Company used a discounted cashflow model to determine the recoverable amount of the Peru CGU which required management to make significant estimates and assumptions related to the future commodity prices, production based on current estimates of recoverable resources, value beyond proven and probable ("VBPP"), discount rate, and future operating and capital costs. The Company determined that there was no impairment of the Peru CGU.

While there are several inputs that are required to determine the recoverable amount of the Peru CGU, the estimates and assumptions with the highest degree of subjectivity and judgment uncertainty are the future short-term and long-term copper price, VBPP, and the discount rate. Auditing these estimates and assumptions required a high degree of auditor judgment in applying audit procedures and in evaluating the results of those procedures. This resulted in an increased extent of audit effort, including the involvement of fair value specialists.

How the Critical Audit Matter Was Addressed in the Audit

Our audit procedures related to the future short-term and long-term copper price, VBPP, and discount rate used to determine the recoverable amount of the Peru CGU included the following procedures, among others:

• Evaluated the effectiveness of relevant controls over management's determination of the future short-term and long-term copper price, VBPP, and discount rate.

• With the assistance of fair value specialists:

- Evaluated the future short-term and long-term copper price by comparing management forecasts to third party forecasts, and

- Evaluate the reasonableness of the VBPP by developing a range of independent VBPP valuation estimates from market transactions and comparing to the VBPP valuation selected by management, and

- Evaluate the reasonableness of the discount rate by testing the source information underlying the determination of the discount rate and developed a range of independent estimates for the discount rate and compared to the discount rate selected by management.

Copper Mountain Mining Corporation ("Copper Mountain") Acquisition - Valuation of Mineral Properties Acquired and Annual Goodwill Impairment Test - Refer to Notes 2d, 5 and 13 of the financial statements

Critical Audit Matter Description

On June 20, 2023, the Company acquired 100% of the issued and outstanding shares of Copper Mountain. The purchase price was allocated to the fair value of assets acquired and liabilities assumed, which included mineral properties that were valued using a discounted cash flow model. The excess of the purchase price was allocated to goodwill. As required by accounting standards, the Company tested the goodwill of the Copper Mountain CGU at December 31, 2023 for impairment by determining the recoverable amount using a discounted cash flow model. The discounted cash flow models required management to make significant estimates and assumptions related to future short-term and long-term copper price, production based on current estimates of recoverable resources, VBPP, discount rate, future foreign exchange rate, and future operating and capital costs. The Company determined that there was no impairment of the Copper Mountain CGU's goodwill based on its annual goodwill impairment test.

While there are several estimates and assumptions that are required to determine the fair value of the mineral properties acquired, the estimates and assumptions with the highest degree of subjectivity are future short-term and long-term copper price and discount rate. While there are several estimates and assumptions that are required to determine the recoverable amount of the Copper Mountain CGU at December 31, 2023, the estimates and assumptions with the highest degree of subjectivity are future short-term and long-term copper price, VBPP, discount rate, and future foreign exchange rate. Auditing these estimates and assumptions required a high degree of auditor judgment in applying audit procedures and in evaluating the results of those procedures. This resulted in an increased extent of audit effort, including the involvement of fair value specialists.

How the Critical Audit Matter Was Addressed in the Audit

Our audit procedures related to the future short-term and long-term copper price, VBPP, discount rate, and future foreign exchange rate used to determine the fair value of the mineral properties acquired and the recoverable amount of the Copper Mountain CGU included the following, among others: 

• Evaluated the effectiveness of relevant controls over management's determination of the future short-term and long-term copper price, VBPP, discount rate, and future foreign exchange rate.

• With the assistance of fair value specialists:

- Evaluate the future short-term and long-term copper price by comparing management's forecasts to third party forecasts,

- Evaluate the reasonableness of the VBPP by developing a range of independent VBPP valuation estimates from market transactions and comparing to the VBPP valuation selected by management,

- Evaluate the reasonableness of the discount rate by testing the source information underlying the determination of the discount rate and developed a range of independent estimates for the discount rate and compared to the discount rate selected by management, and

- Evaluate the reasonableness of the future foreign exchange rate by comparing our independent research of the forecasted rate to management's assumed rates.

/s/ Deloitte LLP

Chartered Professional Accountants

Licensed Public Accountants

Toronto, Canada

February 22, 2024

We have served as the Company's auditor since 2005.

Report of Independent Registered Public Accounting Firm

To the shareholders and the Board of Directors of Hudbay Minerals Inc.

Opinion on Internal Control over Financial Reporting

We have audited the internal control over financial reporting of Hudbay Minerals Inc. and subsidiaries (the "Company") as of December 31, 2023, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). In our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2023, based on criteria established in Internal Control - Integrated Framework (2013) issued by COSO.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated financial statements as of and for the year ended December 31, 2023, of the Company and our report dated February 22, 2024, expressed an unqualified opinion on those financial statements.

As described in Management's Report on Internal Control over Financial Reporting, management excluded from its assessment the internal control over financial reporting at Copper Mountain Mining Corporation ("Copper Mountain"), which was acquired on June 20, 2023, and whose financial statements constitute 34% and 19% of net and total assets, respectively, 10% of revenues, and 19% of net income of the consolidated financial statement amounts as of and for the year ended December 31, 2023. Accordingly, our audit did not include the internal control over financial reporting at Copper Mountain.

Basis for Opinion

The Company's management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management's Report on Internal Control over Financial Reporting. Our responsibility is to express an opinion on the Company's internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

Definition and Limitations of Internal Control over Financial Reporting

A company's internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company's internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company's assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

/s/ Deloitte LLP

Chartered Professional Accountants

Licensed Public Accountants

Toronto, Canada

February 22, 2024

1. Reporting entity

Hudbay Minerals Inc. ("HMI" or the "Company") is a company existing under the Canada Business Corporations Act. The address of the Company's principal executive office is 25 York Street, Suite 800, Toronto, Ontario. The audited consolidated financial statements ("financial statements") of the Company for the year ended December 31, 2023 and 2022 represent the financial position and the financial performance of the Company and its subsidiaries (together referred to as "Hudbay").

Wholly owned subsidiaries as at December 31, 2023 and 2022 include HudBay Marketing & Sales Inc. ("HMS"), HudBay Peru Inc., HudBay Peru S.A.C. ("Hudbay Peru"), HudBay (BVI) Inc., Hudbay Arizona Inc., Copper World, Inc. ("Copper World") and Mason Resources (US) Inc. ("Mason"). On June 20, 2023, the Company acquired all of the issued and outstanding common shares of Copper Mountain Mining Corporation ("Copper Mountain") as part of a court-approved plan of arrangement. At the time, Copper Mountain held a 75% interest in Copper Mountain Mine (BC) Ltd. ("CMBC"), the entity that owns the Copper Mountain mine. Mitsubishi Materials Corporation ("MMC"), an arms-length party, owns the remaining 25% interest in CMBC. On September 14, 2023, the Company acquired all of the issued and outstanding common shares of Rockcliff Metals Corp. ("Rockcliff") as part of a court-approved plan of arrangement. Subsequent to year end, on January 1, 2024, the Company amalgamated with Copper Mountain and Rockcliff and continued as Hudbay Minerals Inc. Following the amalgamation, the Company directly holds a 75% interest in CMBC and is the direct holder of all of Rockcliff's mineral properties.

Hudbay is a diversified mining company with long-life assets in North and South America. Hudbay's operations in Cusco (Peru) produce copper with gold, silver and molybdenum by-products. Hudbay's operations in Manitoba (Canada) produce gold with copper, zinc and silver by-products. Hudbay's operations in British Columbia (Canada) produce copper with gold and silver by-products. Hudbay has a development pipeline that includes copper development projects in Arizona and Nevada (United States), and a focused growth strategy on exploration, development, operation, and optimization of properties that Hudbay already controls, as well as other mineral assets that Hudbay may acquire that fit the Company's strategic criteria. The Company is governed by the Canada Business Corporations Act and its shares are listed under the symbol "HBM" on the Toronto Stock Exchange, New York Stock Exchange and Bolsa de Valores de Lima.

2. Basis of preparation

(a) Statement of compliance:

These consolidated financial statements have been prepared in accordance with International Financial Reporting Standards ("IFRS") as issued by the International Accounting Standards Board ("IASB") effective for the year ended December 31, 2023.

The Board of Directors approved these consolidated financial statements on February 22, 2024.

(b) Functional and presentation currency:

Hudbay's consolidated financial statements are presented in US dollars, which is the Company's and all material subsidiaries' functional currency, except the Company's Manitoba and British Columbia business unit, which have a functional currency of Canadian dollars. All values are rounded to the nearest thousand ($000) except where otherwise indicated.

(c) Basis of measurement:

The consolidated financial statements have been prepared on the historical cost basis except for the following items in the consolidated balance sheets:

- Derivatives, embedded derivatives, other financial instruments, and financial assets measured at fair value through profit or loss ("FVTPL");

- Liabilities for cash-settled share-based compensation arrangements are measured at fair value; and,

- A defined benefit liability is recognized as the net total of the plan assets, unrecognized past service costs and unrecognized actuarial losses, less unrecognized actuarial gains and the present value of the defined benefit obligation.

(d) Use of judgements and estimates:

The preparation of the consolidated financial statements in conformity with IFRS requires Hudbay to make judgements, estimates and assumptions that affect the application of accounting policies, reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements, and reported amounts of revenue and expenses during the reporting period. Actual results may differ from these estimates.

Hudbay reviews these estimates and underlying assumptions on an ongoing basis, based on experience and other factors, including expectations of future events that the Company believes to be reasonable under the circumstances. Revisions to accounting estimates are recognized prospectively in the period in which the estimates are revised and in any future periods affected.

The following are critical and significant judgements and estimates impacting the consolidated financial statements:

- Indicators and testing of impairment (reversal of impairment) of non-financial assets (notes 3h, 3i, 13 and 14) - There are a number of potential indicators that could trigger non-financial asset impairment or reversal of impairment. These indicators may require critical judgements to determine the extent that external and/or internal environmental business changes may impact Hudbay's overall assessment of the recoverability of non-financial assets. Such business changes include changes to the life of mine ("LOM") plan, changes to budget, changes to closure plans, changes to discount rates and changes to long-term commodity prices. If an impairment or impairment reversal indicator is identified then there are also critical estimates involved in the determination of the recoverable amount of cash generating units ("CGU"). A CGU to which goodwill has been allocated is tested for impairment at least annually or when events or circumstances indicate that an assessment for impairment is required. Recoverable amounts are calculated using discounted after-tax cash flows based on cash flow projections and assumptions in Hudbay's most recent LOM plans. LOM plans are based on optimized mine and processing plans and the assessment of capital expenditure requirements of a mine site. LOM plans incorporate management's best estimates of key assumptions which include future commodity prices, the value of mineral resources not included in the applicable LOM plans, production based on current estimates of recoverable reserves, discount rates, future operating and capital costs and future foreign exchange rates. Most critical to the value of the recoverable amount are the assumptions of future commodity prices and the value of mineral resources not included in the applicable LOM plans. Expected future cash flows used to determine the recoverable amount during impairment testing are inherently uncertain and could materially change over time. Should management's estimate of the future not reflect actual events, impairments may be identified, which could have a material effect on the financial statements. Although it is reasonably possible for a change in key assumptions to occur, the possible effects of a change in any single assumption may not fairly reflect the impact of CGU's fair value as the assumptions are inextricably linked.

- Mineral reserves and resources (notes 3g, 3k and 3i) - Hudbay estimates mineral reserves and resources to determine future recoverable mine production based on assessment of geological, engineering and metallurgical analyses, estimates of future production costs, capital costs and reclamation costs, as well as long term commodity prices and foreign exchange rates. There are numerous uncertainties inherent in estimating mineral reserves and resources, including many factors beyond Hudbay's control. The estimates are based on information compiled by appropriately qualified persons relating to the geological data on the size, depth and shape of the ore body and interpreting this data requires complex geological judgements. Changes in assumptions, including economic assumptions such as metals prices and market conditions, could have a material effect on the financial position and results of operations.

Changes in the mineral reserve or resource estimates may affect:

- the carrying value of exploration and evaluation assets, capital works in progress, mining properties and plant and equipment, goodwill;

- depreciation expense for assets depreciated either on a unit-of-production basis or on a straight line basis where useful lives are restricted by the life of the related mine plan;

- the provision for decommissioning, restoration and similar liabilities;

- the carrying value of deferred tax assets, and

- amortization of deferred revenue.

- Property plant and equipment (notes 3h and 14) - The carrying amounts of property, plant and equipment and exploration and evaluation assets on Hudbay's consolidated balance sheets are significant and reflect multiple estimates and applications of judgement. Management exercises judgement in determining whether the costs related to exploration and evaluation are eligible for capitalization and whether they are likely to be recoverable by future exploration, which may be based on assumptions about future events and circumstances. Judgement and estimates are used when determining whether exploration and evaluation assets should be transferred to capital works in progress within property, plant and equipment. For mines in the production stage, management applies judgement to determine development costs to be capitalized based on the extent they are incurred in order to access reserves mineable over more than one year. For depreciable property, plant and equipment assets, management makes estimates to determine depreciation. For assets depreciated using the straight line method, residual value and useful lives of the assets or components are estimated. A significant estimate is required to determine the total production basis for units-of-production depreciation. The most currently available reserve and resource report is utilized in determining the basis which has material impacts on the amount of depreciation recorded through inventories and the consolidated income statements. There are numerous uncertainties inherent in estimating mineral reserves, and assumptions that were valid at the reporting date may change when new information becomes available. The actual volume of ore extracted and any changes in these assumptions could affect prospective depreciation rates and carrying values. In determining whether stripping costs incurred during the production phase of a mining property relate to mineral reserves and mineral resources that will be mined in a future period and therefore should be capitalized, Hudbay makes estimates of the proportion of stripping activity which relates to extracting current ore and the proportion which relates to obtaining access to ore reserves which will be mined in the future.

- Tax provisions (notes 3m and 25) - Management makes estimates in determining the measurement and recognition of deferred tax assets and liabilities recorded on the consolidated balance sheets. The measurement of deferred tax assets and deferred tax liabilities is based on tax rates that are expected to apply in the period that the asset is realized or liability is settled based on tax rates that have been enacted or substantively enacted by the end of the reporting period. Deferred tax assets, including those arising from unutilized tax losses, require management to assess the likelihood of taxable income in the future periods in order to utilize recognized deferred tax assets. Estimates of future taxable income are based on forecasted cash flows from operations and the application of existing tax laws in each jurisdiction. To the extent that future cash flows and taxable income differ significantly from estimates, the ability to realize the net deferred tax assets recorded at the balance sheet date could be affected. At the end of each reporting period, management reassesses the period that the assets are expected to be realized or liabilities are settled and the likelihood of taxable income in future periods in order to support and adjust the deferred tax assets and deferred tax liabilities recognized on the consolidated balance sheets.

- Assaying utilized to determine revenue and recoverability of inventories (notes 3c and 3f) - Assaying of contained metal is a key estimate in determining the amount of revenues recorded in the consolidated income statements. The estimate is finalized after final surveying is completed, which may extend to six months in certain transactions. Since assays are utilized to determine the value of recorded revenues, significant differences in given assays may result in a material misstatement of revenues on the consolidated income statements. Assay survey results are also a factor utilized to determine if inventories on hand have a net realizable value that exceeds cost. Material differences in assay results may lead to misstatements of inventory balances in the consolidated balance sheets.

- Decommissioning and restoration obligations (notes 3k and 22) - Significant judgement and estimates are utilized in the determination of the decommissioning and restoration provisions in the consolidated balance sheets. Judgement is involved in determining the timing and extent of cash outflows required to satisfy constructive obligations based on the timing of site closures in the LOM plans, expected unit costs to determine cash obligations to remediate disturbances and regulatory and constructive requirements, as well as technological changes to determine the extent and timing of the remediation required. The timing of cash outflows and discount rates associated with discounting the provision are also key estimates. Changes in these estimates may result in a change in classification of the provision between non-current and current as well as material differences in the total provision recorded in the consolidated balance sheets.

- Pension and other employee benefit (notes 3j, 23 and 24) - Hudbay's post retirement obligations relate mainly to ongoing health care benefits plans. Hudbay estimates obligations related to the pension and other employee benefits plans using actuarial determinations that incorporate assumptions using management's best estimates of factors including plan performance, salary escalation, retirement dates of employees and drug cost escalation rates. Due to the complexity of the valuation, the underlying assumptions and its long term nature, the defined benefit obligation is highly sensitive to changes in these assumptions. Management reviews all assumptions at each reporting date. In determining the appropriate discount rate, Hudbay considers the interest rates on corporate bonds in the respective currency with at least an AA rating, with extrapolated maturities corresponding to the expected duration of the defined benefit obligation. The mortality rate is based on publicly available mortality tables for the specific country, and Hudbay bases future salary increases and pension increases on expected future inflation rates for the respective country.

- Valuation of an acquired business (note 5) - As the Company concluded that the acquisition of Copper Mountain was a business combination, a valuation was required to determine the allocation of the purchase price. The fair values of the net assets acquired were calculated using significant estimates and judgements. In particular, the fair values of the net assets, including mineral properties, other property, plant and equipment have been determined using an independent valuation involving discounted cash flow calculations and other finance models. Such calculations and models were required to estimate, amongst other items, future production, future commodity prices, operating and capital input costs, discount rates and currency rates. If estimates or judgements differed, this could result in a materially different allocation of net assets to the consolidated balance sheets and could result in a change in the amount of goodwill recognized. Changes to the preliminary values of assets acquired and liabilities assumed,  deferred  income  taxes  and  resulting  goodwill, if any, are retrospectively adjusted when the final measurements are determined if related to conditions existing at the date of acquisition (within one year of acquisition).

- Valuation of assets in an asset acquisition (note 6) - As the Company acquired Rockcliff through the issuance of the Company's common shares and the Company concluded Rockcliff is not a business but an asset acquisition, a valuation was required to the fair value of the net assets acquired. The fair values of the net assets acquired were calculated using significant estimates and judgements. In particular, the fair value of the exploration property has been determined using an independent valuation involving discounted cash flow calculations. Such calculations and models were required to estimate, amongst other items, future production, future commodity prices, operating and capital input costs, discount rates and currency rates.

(e) Estimation uncertainty:

The Company has assessed the broad implications of economic uncertainty including but not limited to inflation and higher interest rates, political instability in Peru and broadly as a result of global geopolitical instability, as well as the lingering impact of the novel coronavirus pandemic, on its consolidated financial statements. As at December 31, 2023, management has determined that the Company's ability to execute its medium and longer term plans and the economic viability of its assets, including the carrying value of its long-lived assets and inventory valuations, are not materially impacted.

In making this judgement, the Company has assessed various criteria including, but not limited to, existing laws, regulations, orders, disruptions and potential disruptions in our supply chain, disruptions in the markets for our products, commodity prices and foreign exchange prices and the actions that the Company has taken at its operations to protect the health and safety of its workforce and local community.

3. Material accounting policies

The accounting policies set out below have been applied consistently to all periods presented in these consolidated financial statements and by all Hudbay's entities.

(a) Basis of consolidation:

Intercompany balances and transactions are eliminated upon consolidation. When a Hudbay entity transacts with an associate or jointly controlled entity of the Company, unrealized profits and losses are eliminated to the extent of Hudbay's interest in the relevant associate or joint venture. The accounting policies of Hudbay's entities are changed when necessary to align them with the policies adopted by the Company.

Subsidiaries

A subsidiary is an entity controlled by Hudbay. The financial statements of subsidiaries are included in the consolidated financial statements from the date that control commences until the date that control ceases.

Non-controlling interest

Non-controlling interest in subsidiaries are identified separately from the Company's equity in the subsidiaries. The interest of non-controlling shareholders may be initially measured either at fair value or at the non-controlling interest proportionate share of the fair value of the acquiree's identifiable net assets. The choice of measurement basis is made on an acquisition-by-acquisition basis. Subsequent to acquisition, the carrying amount of non-controlling interest is the amount of that interest at initial recognition plus the non-controlling interest share of subsequent changes in equity. Total comprehensive income is attributed to non-controlling interest even if this results in the non-controlling interest having a deficit balance.

Business combinations and goodwill

Should Hudbay make an acquisition, it first determines whether the assets acquired and liabilities assumed constitute a business, in which case the acquisition requires accounting as a business combination. Management applies judgement in determining whether the acquiree is capable of being conducted and managed for the purpose of providing a return, considering the inputs of the acquiree and processes applied to those inputs that have the ability to create outputs.

Hudbay applies the acquisition method of accounting to business combinations, whereby the goodwill is measured at the acquisition date as the fair value of the consideration transferred including the recognized amount of any non-controlling interest in the acquiree. When the excess is negative, a bargain purchase gain is recognized immediately in the consolidated income statements. The assessment of fair values on acquisition includes those mineral reserves and resources that are able to be reliably measured. In determining these fair values, management must also apply judgement in areas including future cash flows, metal prices, exchange rates and appropriate discount rates. Changes in such estimates and assumptions could result in significant differences in the amount of goodwill recognized.

The consideration transferred is the aggregate of the fair values, at the date of the acquisition, of the sum of the assets transferred, the liabilities incurred or assumed, and the equity instruments issued by the acquirer in exchange for control of the acquiree. Acquisition-related costs are recognized in the consolidated income statements as incurred, unless they relate to issuance of debt or equity securities.

Where applicable, the consideration transferred includes any asset or liability resulting from a contingent consideration arrangement and measured at its acquisition date fair value. Subsequent changes in such fair values are adjusted against the cost of acquisition where they qualify as measurement period adjustments. All other subsequent changes in the fair value of contingent consideration classified as an asset or liability are accounted for in accordance with relevant IFRS. Changes in the fair value of contingent consideration classified as equity are not recognized.

Where a business combination is achieved in stages, the Company's previously held interest in the acquired entity are remeasured to fair value at the acquisition date, which is the date Hudbay attains control, and any resulting gain or loss is recognized in the consolidated income statements. Amounts previously recognized in other comprehensive income ("OCI") related to interest in the acquiree prior to the acquisition date are reclassified to the consolidated income statements, where such treatment would be appropriate if that interest were disposed of.

After initial recognition, goodwill is measured at cost less any accumulated impairment losses. For the purpose of impairment testing, goodwill acquired in a business combination is, from the acquisition date, allocated to each of Hudbay's CGUs that are expected to benefit from the synergies of the combination, irrespective of whether other assets or liabilities of the acquiree are assigned to those units. Goodwill is allocated to the lowest level at which it is monitored for internal management purposes and is not larger than an operating segment before aggregation. Where goodwill forms part of a CGU and part of the operation within that unit is disposed of, the goodwill associated with the disposed operation is included in the determination of any gain or loss on disposal.

Goodwill is not amortized and is tested for impairment annually and whenever there is an indication of impairment. If any such indication exists, the recoverable amount of the CGU is estimated in order to determine the extent of the impairment, if any. The recoverable amount is determined as the higher of fair value less direct costs to sell and the CGU's value in use. When the recoverable amount of the CGU is less than the carrying amount of that CGU, the impairment loss is allocated to reduce the carrying amount of any goodwill allocated to that CGU first, and then to the other assets of that CGU on a pro-rata basis of the carrying amount of each asset in the CGU. An impairment loss in respect of goodwill is not reversed.

Fair value for mineral interest and related goodwill is generally determined as the present value of the estimated future cash flows expected to arise from the continued use of the asset, including any expansion prospects, and its eventual disposal, using assumptions that an independent market participant may take into account.

Value in use is determined as the present value of the estimated future cash flows expected to arise from the continued use of the asset in its present form and its eventual disposal. Value in use is determined by applying assumptions specific to Hudbay's continued use and cannot take into account future development.

The weighted average cost of capital of Hudbay or comparable market participants is used as a starting point for determining the discount rates, with appropriate adjustments for the risk profile of the countries in which the individual CGUs operate and the specific risks related to the development of the project.

Where the asset does not generate cash flows that are independent of other assets, Hudbay estimates the recoverable amount of the CGU to which the asset belongs. If the carrying amount of an asset or CGU exceeds its recoverable amount, the carrying amount of the asset or CGU is reduced to its recoverable amount. An impairment loss is recognized as an expense in the consolidated income statements.

(b) Translation of foreign currencies:

Management determines the functional currency of each Hudbay entity as the currency of the primary economic environment in which the entity operates.

Foreign currency transactions

Transactions in foreign currencies are translated to the respective functional currencies of Hudbay's entities at exchange rates in effect at the transaction dates.

At the end of each reporting period, monetary assets and liabilities denominated in foreign currencies are translated to the functional currency using the closing exchange rate. Non-monetary assets and liabilities measured at fair value are translated using the exchange rates at the date when fair value was determined. Non-monetary assets and liabilities measured at historical cost in a foreign currency are translated using exchange rates that were in effect at the transaction dates. The same translations are applied when an entity prepares its financial statements from books and records maintained in a currency other than its functional currency, except revenue and expenses may be translated at monthly average exchange rates that approximate those in effect at the transaction dates.

Foreign currency gains and losses arising on period-end revaluations are recognized in the consolidated income statements, except for a financial liability designated as a hedge of a net investment in a foreign operation, or qualifying cash flow hedges, which are recognized in OCI.

Foreign operations

For the purpose of the consolidated financial statements, assets and liabilities of Hudbay's entities that have functional currencies other than the US dollar are translated to US dollars at the reporting date using the closing exchange rate. Revenue and expenses are translated at monthly average exchange rates that approximate those in effect at the transaction dates. Differences arising from these foreign currency translations are recognized in OCI and presented within equity in the foreign currency translation reserve. When a foreign operation is disposed, the relevant exchange differences accumulated in the foreign currency translation reserve are transferred to the consolidated income statements as part of the profit or loss on disposal. On the partial disposal of a subsidiary that includes a foreign operation, the relevant proportion of such amount is reattributed to non-controlling interest. On disposal of a partial investment in an associate or joint venture that includes a foreign operation while retaining significant influence or joint control, the relevant proportion is reclassified to profit or loss.

Net investment in a foreign operation

Foreign currency gains and losses arising on translation of a monetary item receivable from or payable to a foreign operation for which settlement is neither planned nor likely to occur in the foreseeable future are considered to form part of a net investment in the foreign operation. Such gains and losses are recognized in OCI and presented within equity in the foreign currency translation reserve.

(c) Revenue recognition:

Revenue from the sale of goods is measured at the fair value of the consideration received or receivable, net of treatment and refining charges. Revenue from the sale of by-products is included within revenue.

Revenue is recognized when control of the goods sold has been transferred to the customer. Control is deemed to have passed to the customer when significant risk and reward of the product has passed to the customer, Hudbay has a present right to payment, and physical possession of the product has been transferred to the customer. Sales of doré are recorded when a trade confirmation is duly signed and executed between Hudbay and the end purchaser. Sale of concentrate and finished zinc frequently occur under the following terms, and management has assessed these terms in order to determine timing of transfer of control and revenue recognition as generally outlined in the following table.

Sales of copper and zinc concentrate and certain other products are provisionally priced. For these contracts, sales prices are subject to final adjustment at the end of a future period after shipment, based on quoted market prices during the quotational period specified in the contract. Revenue is recognized when the above criteria are achieved, using weight and assay results and forward market prices to estimate the fair value of the total consideration receivable. Therefore, revenue is initially recorded based on an initial provisional invoice. Subsequently, at each reporting date, until the provisionally priced sale is finalized, sales receivables are marked to market, with adjustments (both gains and losses) recorded within revenue separately as "Pricing and volume adjustments" in the notes to the consolidated financial statements and in trade and other receivables on the consolidated balance sheets. As per IFRS 15 Revenue from contracts with customers, variability in price is deemed to be fair value movements on provisionally priced receivables under the scope of IFRS 9 Financial Instruments; variability in quantities is deemed to be variable consideration. The variable consideration from weights and assay changes to quantities has been assessed to be insignificant to warrant precluding revenue being recorded as a result of possible future sales reversals. An annual analysis of the accuracy of our weights and assays is completed, and if the accuracy rate falls below a certain threshold, management then evaluates whether revenue from future sales should be constrained as a result of it being highly probable that there would be a significant revenue reversal in the future.

Hudbay only includes in the transaction price an amount which is not highly likely to be subject to significant subsequent revenue reversal. Within sales contracts with customers, separate performance obligations may arise pertaining to the shipping of goods sold. If applicable, costs and the transaction price are allocated on a relative standalone selling basis to any separate performance obligations and are recognized over the period of time the goods sold are shipped, on a gross basis.

Hudbay recognizes deferred revenue in the event it receives payments from customers before a sale meets criteria for revenue recognition.

Precious metals stream contracts, which at inception of the contract are determined that they can be satisfied through the delivery of Hudbay's own production of non-financial items (i.e. gold and silver credits) rather than cash or other financial assets, are accounted for as deferred revenue. If settlement with Hudbay's own production of gold and silver is not possible, the stream transaction is recognized as a financial liability since settlement may require a cash payment. This would cause a change to the accounting treatment, resulting in the revaluation of the agreement to the fair value through the consolidated income statements on a recurring basis.

Deferred revenue associated with precious metals stream contracts are subject to variable consideration and contain a significant financing component since funds were received in advance of the delivery of concentrate. When a significant financing component is recognized, finance expense will be higher and revenues will be higher as the larger deferred revenue balance is amortized to revenues. A market-based discount rate is utilized at the inception of each of the respective stream agreements to determine a discount rate for computing the interest charges for the significant financing component of the deferred revenue balance. As product is delivered, the deferred revenue amount including accreted interest will be drawn down. The draw down rate requires the use of proven and probable reserves and certain resources in the calculation that are beyond proven and probable reserves which management is reasonably confident will be transferable to reserves. Key estimates used in determining the significant financing component include the discount rate and the reserve and resources assumed for conversion.

(d) Cost of sales:

Cost of sales consists of those costs previously included in the measurement of inventory sold during the period, as well as certain costs not included in the measurement of inventory, such as the cost of warehousing and distribution to customers, provisional pricing adjustments related to purchased concentrates, profit sharing, royalty payments, share-based compensation expense and other indirect expenses related to producing operations.

Cost of sales also include non-cash net realizable value adjustments to inventory, one-time adjustments related to overheads incurred when not operating at normal capacity and one-time labour charges related to facilitating the production of inventories for past service pension costs, curtailment gains and severance.

(e) Cash and cash equivalents:

Cash and cash equivalents include cash, demand deposits and short-term, highly liquid investments that are readily convertible to known amounts of cash and are subject to an insignificant risk of changes in value. Cash equivalents have maturities of three months or less at the date of acquisition. Interest earned is included in finance income on the consolidated income statements and in investing activities on the consolidated statements of cash flows.

Amounts that are restricted from being used for at least twelve months after the reporting date or are not available for general disbursement, like a debt service account are classified as non-current assets and presented in other financial assets on the consolidated balance sheets. Changes in restricted cash balances are classified as investing or financing activities on the consolidated statements of cash flows.

(f) Inventories:

Inventories consist of stockpiles, finished goods inventory (concentrates and metals), materials and supplies. Concentrates, doré, metals and all other saleable products are valued at the lower of cost and estimated net realizable value. Net realizable value represents the estimated selling price for inventories less all estimated direct and indirect costs of completion and costs necessary to make the sale. Where the net realizable value is less than cost, the difference is charged to the consolidated income statements as an impairment charge in cost of sales. Costs associated with stripping activities in an open pit mine are capitalized to inventory and recorded through cost of sales unless the stripping activity can be shown to improve access to further quantities of ore that will be mined in future periods, in which case, the stripping costs are capitalized to property, plant and equipment.

Cost of production of concentrate inventory is determined on a weighted average cost basis and the cost of production of finished metal inventory is determined using the first in first out basis. The cost of production includes direct costs associated with conversion of production inventory based on normal production capacity: material, labour, contractor expenses, purchased concentrates, and an attributable portion of production overheads and depreciation of all property, plant and equipment involved with the mining and production process. Hudbay measures in-process inventories based on assays of material received at metallurgical plants and estimates of recoveries in the production processes. Due to significant uncertainty associated with volume and metal content, immaterial costs are not allocated to routine operating levels of stockpiled ore. Estimates and judgements are required to assess the nature of any significant changes to levels of ore stockpiles and determining whether allocation of costs is required.

Supplies are valued at the lower of average cost and net realizable value.

(g) Exploration and evaluation expenditures:

Exploration and evaluation activity begins when Hudbay obtains legal rights to explore a specific area and involves the search for mineral reserves, the determination of technical feasibility, and the assessment of commercial viability of an identified resource. Expenditures incurred in the exploration and evaluation phase include the cost of acquiring interest in mineral rights, licenses and properties and the costs of Hudbay's exploration activities, such as researching and analyzing existing exploration data, gathering data through geological studies, exploratory drilling, trenching, sampling, and certain feasibility studies.

Hudbay expenses the cost of its exploration and evaluation activities and capitalizes the cost of acquiring interest in mineral rights, licenses and properties in business combinations, asset acquisitions or option agreements. Amounts capitalized are recognized as exploration and evaluation assets and presented in property, plant and equipment. Exploration and evaluation assets acquired as a result of an asset acquisition or option agreement are initially recognized at cost, and those acquired in a business combination are recognized at fair value on the acquisition date. They are subsequently carried at cost less accumulated impairment. No depreciation is charged during the exploration and evaluation phase. Hudbay expenses the cost of subsequent exploration and evaluation activity related to acquired exploration and evaluation assets. Cash flows associated with acquiring exploration and evaluation assets are classified as investing activities in the consolidated statements of cash flows; those associated with exploration and evaluation expenses are classified as operating activities.

Judgement is required in determining whether the respective costs are eligible for capitalization where applicable, and whether they are likely to be recoverable, which may be based on assumptions about future events and circumstances. Estimates and assumptions made may change if new information becomes available.

Hudbay monitors exploration and evaluation assets for factors that may indicate their carrying amounts are not recoverable. If such indicators are identified, the Company tests the exploration and evaluation assets or their CGUs, as applicable, for impairment. Hudbay also tests for impairment when assets reach the end of the exploration and evaluation phase.

Exploration and evaluation assets are transferred to capital works in progress within property, plant and equipment once the Company determines that probable future economic benefits will be generated as a result of the expenditures. Hudbay's determination of probable future economic benefit is based on management's evaluation of the technical feasibility and commercial viability of the geological properties of a given ore body based on information obtained through evaluation activities, including metallurgical testing, resource and reserve estimates and the economic assessment of whether the ore body can be mined economically. Tools that may be used to determine this include a preliminary feasibility study, confidence in converting resources into reserves and the probability that the property could be developed into a mine site. At that time, the property is considered to enter the development phase, and subsequent evaluation costs are capitalized.

(h) Property, plant and equipment:

Hudbay measures items of property, plant and equipment at cost less accumulated depreciation and any accumulated impairment losses.

The initial cost of an item of property, plant and equipment includes its purchase price or construction costs, including import duties and non-refundable purchase taxes, any costs directly attributable to bringing the asset into operation, and for qualifying assets, borrowing costs. The initial cost of property, plant and equipment also includes the initial estimate of the cost of dismantling and removing the item and restoring the site on which it is located, the obligation which Hudbay incurs either when the item is acquired or as a consequence of having used the item during a particular period for purposes other than to produce inventories during that period.

Capitalization of costs ceases once an asset is in the location and condition necessary for it to be capable of operating in the manner intended by management. At this time, depreciation commences. For a new mine, this occurs upon commencement of commercial production. Any revenues less cost to produce, earned prior to commencement of commercial production, are included in the consolidated income statements.

Carrying amounts of property, plant and equipment, including right-of-use ("ROU") assets, are depreciated to their estimated residual value over the estimated useful lives of the assets or the estimated life of the related mine or plant, if shorter. Where components of an asset have different useful lives, depreciation is calculated on each separate component. Components may be physical or non-physical, including the cost of regular major inspections and overhauls required in order to continue operating an item of property, plant and equipment.

Certain items of property, plant and equipment are depreciated on a unit-of-production basis. The unit-of-production method is based on proven and probable tonnes of ore reserves. There are numerous uncertainties inherent in estimating ore reserves, and assumptions that were valid at the reporting date may change when new information becomes available. The actual volume of ore extracted and any changes in these assumptions could affect prospective depreciation rates and carrying values.

The carrying amount of an item of property, plant and equipment is derecognized on disposal or when no future economic benefits are expected from its use or disposal. Upon derecognition of an item of property, plant and equipment, the difference between its carrying value and net sales proceeds, if any, is presented as a gain or loss in other operating income or expense in the consolidated income statements.

i. Capital works in progress:

Capital works in progress consist of items of property, plant and equipment in the course of construction or mineral properties in the course of development, including those transferred upon completion of the exploration and evaluation phase. On completion of construction or development, costs are transferred to plant and equipment and/or mining properties as appropriate. Capital works in progress are not depreciated.

ii. Mining properties:

Mining properties consist of costs transferred from capital works in progress when a mining property reaches commercial production, costs of subsequent mine and exploration development, and acquired mining properties in the production stage.

Mining properties include costs directly attributable to bringing a mineral asset into the state where it is capable of operating in the manner intended by management and includes such costs as the cost of shafts, ramps, track haulage drifts, ancillary drifts, pumps, electrical substations, refuge stations, ventilation raises, permanent manways, and ore and waste pass raises. The determination of development costs to be capitalized during the production stage of a mine operation requires the use of judgements and estimates such as estimates of tonnes of waste to be removed over the life of the mining area and economically recoverable reserves extracted as a result.

A mining property is considered to be capable of operating in a manner intended by management when it commences commercial production based on pre-established criteria. Upon commencement of commercial production, a mining property is depreciated on a unit-of-production method. Unit-of-production depreciation rates are determined based on the related proven and probable mineral reserves and associated future development costs.

Subsequent mine development costs are capitalized to the extent they are incurred in order to access reserves mineable over more than one year. Ongoing maintenance and development expenditures are expensed as incurred and included in cost of sales in profit or loss. These include ore stope access drifts, footwall and hangingwall drifts in stopes, drawpoints, drill drifts, sublevels, slots, drill raises, stope manway access raises and definition diamond drilling.

iii. Plant and equipment:

Plant and equipment consists of buildings and fixtures, surface and underground fixed and mobile equipment and assets under lease.

Plant and equipment are depreciated on either unit-of-production or straight-line basis based on factors including the production life of assets and mineable reserves. In general, mining assets are depreciated using a unit-of-production method; equipment is depreciated using the straight-line method, based on the shorter of its useful life and that of the related mine or facility; and plants are depreciated using the straight-line method, with useful lives limited by those of related mining assets.

iv. Right-of-use lease assets:

At inception of a contract, Hudbay assesses whether a contract is, or contains, a lease. A contract is, or contains, a lease if the contract conveys the right to control the use of an identified asset for a period of time in exchange for consideration. The Company assesses the following criteria in the determination of whether a contract conveys the right to control the use of an identified asset:

• The contract involves the use of an identified asset - this may be specified explicitly or implicitly, and should be physically distinct or represent substantially all of the capacity of a physically distinct asset. If the supplier has substantive substitution rights, then the asset is not identified;

• Hudbay has the right to obtain substantially all of the economic benefits from use of the asset throughout the period of use; and

• Hudbay has the right to direct the use of the asset by means of decision making rights that are most relevant to changing how and for what purpose the asset is used. In the case where decisions about the asset's purpose is predetermined, Hudbay is deemed to have the right to direct the use of the asset if either:

▪ Hudbay has the right to operate the asset; or,

▪ Hudbay designed the asset in a way that predetermines how and for what purpose it will be used.

The Company recognizes a ROU asset and lease liability at the lease commencement date. The initial measurement of the ROU asset is on a present value basis. This is based on the calculated lease liability plus any initial direct costs incurred, an estimate of removal or restoration costs, and any payments made prior to commencement of the lease less any lease incentives received.

The right of use asset is subsequently depreciated using the straight-line method from the commencement date to the earlier of the end of the useful life of the right-of-use asset or the end of the lease term. The estimated useful lives of the right-of-use assets are determined on the same basis as those of property and equipment. In addition, the right-of-use asset is periodically reduced by impairment losses, if any, and adjusted for certain remeasurements of the lease liability.

The lease liability is measured at the present value of the lease payments that are yet to be paid at the commencement date, discounted using the interest rate implicit in the lease or, if that rate cannot be easily determined, Hudbay's incremental borrowing rate. Generally, the Company uses its incremental borrowing rate as the discount rate for applicable leases.

Lease payments included in the measurement of the lease liability comprise fixed payments including in substance fixed payments and variable payments that depend on an index or rate, amounts expected to be payable under a residual value guarantee and the additional costs Hudbay reasonably expects to incur due to purchase options, extension options and termination options reasonably expected to be exercised.

The lease liability is measured at amortized cost using the effective interest method. It is remeasured when there is a change in the expected future cash flows of a leasing contract either due to a change in index or rate, or due to a change in terms of the contract. When the lease liability is remeasured in this way, a corresponding adjustment is made to the carrying amount of the right-of-use asset, or is recorded in profit or loss if the carrying amount of the right-of-use asset is zero.

Hudbay has elected not to separate non-lease components and account for the lease and non-lease components as a single lease component for lease contracts of all asset classes.

The Company has elected not to recognize ROU assets and lease liabilities for short-term leases of machinery that have a lease term of 12 months or less and leases of low-value assets. Hudbay recognizes the lease payments associated with these leases as an expense on a straight-line basis over the lease term.

Hudbay does not enter into transactions where the Company acts as a lessor.

The incremental borrowing rate used for new ROU leases is a key management judgement.

v. Depreciation rates of major categories of assets:

• Capital works in progress - not depreciated

• Mining properties - unit-of-production

• Mining asset - unit-of-production

• Plant and Equipment                     

◦ Equipment - straight-line over 1 to 20 years

◦ Other plant assets - straight-line over 1 to 20 years/unit-of-production

• ROU Assets - straight-line over 1 to 20 years

Hudbay reviews its depreciation methods, remaining useful lives and residual values at least annually and accounts for changes in estimates prospectively.

vi. Commercial production:

Commercial production is the level of activities intended by management for a mine, or a mine and mill complex, to be capable of operating in the manner intended by management. Hudbay considers a range of factors when determining the level of activity that represents commercial production for a particular project, including a predetermined percentage of design capacity for the mine and mill; achievement of continuous production, ramp-ups, or other output; or specific factors such as recoveries, grades, or inventory build-ups. In a phased mining approach, management may consider achievement of specific milestones at each phase of completion. In a non-phased mining approach, management considers average actual metrics that are at least 60% of average design capacity or plan over a continuous period. Management assesses the operation's ability to sustain production over a period of approximately one to three months, depending on the complexity related to the stability of continuous operation. Commercial production is considered to have commenced, and depreciation expense is recognized, at the beginning of the month after criteria have been met.

vii. Capitalized borrowing costs:

The Company capitalizes borrowing costs that are directly attributable to the acquisition, construction or production of qualifying assets, which are assets that necessarily take a substantial period of time, generally one year or more, to get ready for their intended use or sale. Capitalization of borrowing costs ceases once the qualifying assets commence commercial production or are otherwise ready for their intended use or sale.

Where funds are borrowed specifically to finance a project, the amount capitalized represents the actual borrowing costs incurred. Where the funds used to finance a project form part of general borrowings, the amount capitalized is calculated using a weighted average of interest rates applicable to relevant general borrowings of Hudbay during the period, to a maximum of actual borrowing costs incurred. Investment income earned by temporarily investing specific borrowings pending their expenditure on qualifying assets is deducted from the borrowing costs eligible for capitalization. Capitalization of interest is suspended during extended periods in which active development is interrupted.

All other borrowing costs are recognized in the consolidated income statements in the period in which they are incurred.

viii. Capitalized stripping costs:

Costs associated with stripping activities in an open pit mine are capitalized to inventory and recorded through cost of sales unless the stripping activity can be shown to improve access to further quantities of ore that will be mined in future periods, in which case, the stripping costs are capitalized to property, plant and equipment. Capitalized stripping costs are included in "mining properties" within property, plant and equipment.

Capitalized stripping costs are depreciated using a units-of-production method over the expected reserves within a given phase of mine development.

(i) Impairment of non-financial assets:

At the end of each reporting period, Hudbay reviews the carrying amounts of property, plant and equipment, exploration and evaluation assets and intangible assets - computer software to determine whether there is any indication of impairment. If any such indication exists, the Company estimates the recoverable amount of the asset in order to determine the extent of the impairment loss, if any. Hudbay generally assesses impairment at the level of CGUs, which are the smallest identifiable groups of assets that generate cash inflows that are largely independent of cash inflows from other assets.

Hudbay's CGUs consist of Manitoba, British Columbia, Peru, Arizona and greenfield exploration assets.

The Company allocates near mine exploration and evaluation assets to CGUs based on their operating segment, geographic location and management's intended use for the property. Near mine exploration and evaluation assets are allocated to CGUs separate from those containing producing or development-phase assets, except where such exploration and evaluation assets have the potential to significantly affect the future production of producing or development-phase assets.

Goodwill is tested for impairment annually and whenever there is an indication that the asset may be impaired. The Company performs goodwill impairment tests on an annual basis as at December 31 each year. If the carrying value of the CGU or group of CGUs to which goodwill is assigned exceeds its recoverable amount, an impairment loss is recognized. Goodwill impairment losses are recorded in the consolidated income statements and they are not subsequently reversed.

Where an indicator of impairment exists, a formal estimate of the recoverable amount of the asset or CGU is made. The recoverable amount is the higher of the fair value less costs of disposal and value in use:

- Fair value less costs of disposal is the amount obtainable from the sale of the asset or CGU in an arm's length transaction between knowledgeable, willing parties, less costs of disposal. Fair value for mineral assets is often determined as the present value of the estimated future cash flows expected to arise from the continued use of the asset, including any expansion prospects, and its eventual disposal, using assumptions that an independent market participant may take into account. These cash flows are discounted by an appropriate discount rate that reflects current market assessments of the time value of money and the risks specific to the asset to arrive at a net present value of the asset.

- Value in use is determined as the present value of the estimated future cash flows expected to arise from the continued use of the asset or CGU in its present form and its eventual disposal, discounted using a pre-tax rate that reflects current market assessments of the time value of money and risks specific to the asset for which estimates of future cash flows have not been adjusted. Value in use calculations apply assumptions specific to the Company's continued use and cannot take into account future development. These assumptions are different to those used in calculating fair value, and consequently the value in use calculation is likely to give a different result to a fair value calculation.

Hudbay estimates future cash flows based on estimated future recoverable mine production, expected sales prices (considering current and historical commodity prices, price trends and related factors), production levels and cash costs of production, all based on detailed engineering LOM plans. Future recoverable mine production is determined from reserves and resources after taking into account estimated dilution and recoveries during mining, and estimated losses during ore processing and treatment. Estimates of recoverable production from measured, indicated and inferred mineral resources not included in the LOM plan are assessed for economic recoverability and may also be included in the valuation of fair value less costs of disposal. Gains from the expected disposal of assets are not included in estimated future cash flows. Assumptions underlying future cash flow estimates are subject to risks and uncertainties. Changes in estimates may affect the expected recoverability of the Company's investments in mining properties.

If the carrying amount of an asset or CGU exceeds its recoverable amount, the carrying amount is reduced to the recoverable amount, and an impairment loss is recognized in the consolidated income statements in the expense category consistent with the function of the impaired asset or CGU. Hudbay presents impairment losses on the consolidated income statements as part of results from operating activities. Impairment losses recognized in respect of a CGU are allocated first to reduce the carrying amount of any goodwill allocated to the CGU and then to reduce the carrying amounts of other assets in the CGU on a pro-rata basis for depreciable assets.

The Company assesses previously recognized impairment losses each reporting date for any indications that the losses have decreased or no longer exist. Such an impairment loss is reversed, in full or in part, if there have been significant changes with a positive effect on the estimates used to determine the recoverable amount. An impairment loss is reversed only to the extent that the asset's carrying amount does not exceed the carrying amount that would have been determined, net of depreciation or amortization, if no impairment loss had been recognized for the asset in prior years. Such reversals of impairment losses are recognized in the consolidated income statements. An impairment loss recognized in relation to goodwill is not reversed for subsequent increases in the recoverable amount.

(j) Pension and other employee benefits:

Hudbay has non-contributory and contributory defined benefit programs for the majority of its Canadian employees. The defined benefit pension benefits are based on years of service and final average salary for the salaried plans and are based on a flat dollar amount combined with years of service for the hourly plans. The Company provides non pension health and other post-employment benefits to certain active employees and pensioners (post-employment benefits) and also provides disability income, health benefits and other post-employment benefits to hourly and salaried disabled employees (other long-term employee benefits).

Hudbay accrues its obligations under the defined benefit plans as the employees render the services necessary to earn the pension and post-employment benefits. The actuarial determination of the accrued benefit obligations for pensions and post-employment benefits uses the projected benefit method pro-rated on service (which incorporates management's best estimate of future salary levels, other cost escalation, retirement ages of employees and other actuarial factors). For other long-term employee benefits, the Company recognizes the full cost of the benefit obligation at the time the employee becomes disabled. Actuarial advice is provided by external consultants.

For the funded defined benefit plans, Hudbay recognizes the deficit or excess of the fair value of plan assets over the present value of the defined benefit obligation as a liability or an asset in the consolidated balance sheets. However, the Company recognizes an excess of assets only to the extent that it represents a future economic benefit which is available in the form of refunds from the plan or reductions in future contributions to the plan. When these criteria are not met, it is not recognized but is disclosed in the notes to the consolidated financial statements. Impacts of minimum funding requirements in relation to past service are considered when determining the balance sheet position.

Defined benefit costs are categorized as follows:

- Service costs (including current service cost, past service cost, as well as gains and losses on curtailments and settlements and administration costs);

- Net interest expense or income; and,

- Remeasurement.

The first two components of defined benefit costs shown above are recognized in the consolidated income statements. Past service cost as well as curtailment gains are recognized in the consolidated income statements in the period of a plan amendment. Net interest is calculated by applying the discount rate at the beginning of the period to the net defined benefit liability or asset.

Purchases and sales of plan assets are recorded on settlement date.

Remeasurement, comprising actuarial gains and losses, the effect of changes to the asset ceiling (if applicable) and the return on plan assets (excluding interest), is reflected immediately in the consolidated balance sheets with a gain or loss recognized in OCI in the period in which they occur. Remeasurement recognized in OCI is reflected in the remeasurement reserve and will not be reclassified to the consolidated income statements. For the other long-term employee benefits plan, remeasurements are recognized immediately in the consolidated income statements.

Actuarial determinations used in estimating obligations relating to these plans incorporate assumptions using management's best estimates of factors including plan performance, salary escalation, retirement dates of employees and healthcare cost escalation rates. Due to the complexity of the valuation, the underlying assumptions and its long-term nature, a defined benefit obligation is highly sensitive to changes in these assumptions. All assumptions are reviewed at each reporting date. In determining the appropriate discount rate, management considers the interest rates on corporate bonds in the respective currency with at least an AA rating, with extrapolated maturities corresponding to the expected duration of the defined benefit obligation. The mortality rate is based on publicly available mortality tables for the specific country. Future salary increases and pension increases are based on expected future inflation rates for the respective country.

Hudbay also has defined contribution plans providing pension benefits for certain of its salaried employees and certain of its US employees utilizing 401K plans. The Company recognizes the cost of the defined contribution plans based on the contributions required to be made during each period.

Termination benefits are recognized as an expense when Hudbay is committed demonstrably, without realistic possibility of withdrawal, to a formal detailed plan to either terminate employment before the normal retirement date, or to provide termination benefits as a result of an offer made to encourage voluntary redundancy. Termination benefits for voluntary redundancies are recognized as an expense if the Company has made an offer of voluntary redundancy, it is probable that the offer will be accepted, and the number of acceptances can be estimated reliably. Benefits that are payable more than one year after the reporting period are discounted to their present value.

(k) Environmental and other provisions:

Provisions are recognized when Hudbay has a present obligation (legal or constructive) as a result of a past event, it is probable that an outflow of resources will be required to settle the obligation, and a reliable estimate can be made. The provisions are recorded as management's best estimate of the amount required to settle an obligation.

Provisions are stated at their present value, which is determined by discounting the expected future cash flows at a pre-tax rate that reflects current market assessments of the time value of money and the risks specific to the liability.

Decommissioning, restoration and similar liabilities

Provisions are recorded for legal and constructive obligations associated with the future costs of rehabilitating the Company's current and previous operating and development sites. Such costs are associated with decommissioning and restoration activities such as dismantling and removing structures, rehabilitating mines and tailings, and reclamation and re-vegetation of affected areas.

The present value of estimated costs is recorded in the period in which the asset is installed or the environment is disturbed and a reasonable estimate of future costs and discount rates can be made. The provision is discounted using a risk-free rate, and estimates of future cash flows are adjusted to reflect risk.

Subsequent to the initial measurement, the obligation is adjusted to reflect the passage of time and changes in the estimated future cash flows underlying the obligation. The increase in the provision due to the passage of time is recognized as finance expense, whereas increases and decreases due to changes in the estimated future cash flows, which are not the result of current inventory production, are capitalized and depreciated over the life of the related operating asset. Actual costs incurred upon settlement of the site restoration obligation are charged against the provision to the extent the provision was established for those costs. Upon settlement of the liability, a gain or loss may be recorded. For closed sites, changes to estimated costs are recognized immediately in the consolidated income statements within other expenses.

Hudbay assesses the reasonableness of its estimates and assumptions each year and when conditions change, the estimates are revised accordingly. Judgement is required to determine the scope and timing of future decommissioning and restoration activities, as well as best available estimates and assumptions including discount rates, expected timing of decommissioning and restoration costs, inflationary factors and market risks. Changes in cost estimates, which may arise from changes in technology and pricing of the individual components of the cost may result in offsetting changes to the asset and liability and corresponding changes to the associated depreciation and finance costs. In view of the uncertainties concerning these future obligations, the ultimate timing and cost of reclamation and mine closure may differ materially from these estimates.

If the change in estimate results in a significant increase in the decommissioning liability and therefore an addition to the carrying value of the asset, the Company considers whether this is an indication of impairment of the asset as a whole and, if so, tests for impairment in accordance with IAS 36, Impairment of non-financial assets. If, for mature mines, the revised mine assets net of decommissioning and restoration liabilities exceeds the recoverable value, that portion of the increase is charged directly to expense as an impairment loss, within the gross profit / (loss) line.

In view of the uncertainties concerning environmental remediation, the ultimate cost of decommissioning and restoration liabilities could differ materially from the estimated amounts provided. The estimate of the total liability is subject to change based on amendments to laws and regulations and as new information concerning Hudbay's operations becomes available. Future changes, if any, to the estimated total liability as a result of amended requirements, laws, regulations and operating assumptions, as well as discount rates, may be significant and would be recognized prospectively as a change in accounting estimate, when applicable. Environmental laws, regulations and technology are continually evolving in all regions in which the Company operates. Hudbay is not able to determine the impact, if any, of environmental laws, regulations and technology that may be enacted in the future on its results of operations or financial position due to the uncertainty surrounding the ultimate form that such future laws and regulations may take.

Onerous contracts

A contract is considered to be onerous when the unavoidable costs of meeting obligations under the contract exceed the economic benefits expected to be received under it. Hudbay records a provision for any onerous contracts at the lesser of costs to comply with a contract and costs to terminate it.

Restructuring provisions

A provision for restructuring is recognized when management, with appropriate authority within Hudbay, has approved a detailed and formal restructuring plan, and the restructuring has either commenced or has been announced publicly. Future operating costs are not provided for.

(l) Financial instruments:

Non-derivative financial instruments are initially recognized at fair value plus, in the case of a financial asset or financial liability not measured at fair value through profit or loss, directly attributable transaction costs. Measurement in subsequent periods depends on the financial instrument's classification. Hudbay uses trade date accounting for regular way purchases or sales of financial assets. The Company determines the classification of its financial instruments and non-financial derivatives at initial recognition.

Financial assets and liabilities are offset and the net amount presented in the consolidated balance sheets when, and only when, Hudbay has a legal right to offset the amounts and intends either to settle on a net basis or to realize the asset and settle the liability simultaneously.

The classification of financial assets is based on the results of the contractual characteristics test and the business model assessment which will result in the financial asset being classified as either: amortized cost, fair value through profit or loss ("FVTPL") or fair value through other comprehensive income ("FVTOCI").

i. Non-derivative financial instruments - classification:

Financial assets at fair value through profit or loss

Provisionally priced copper and zinc concentrate sales receivables, warrants and investments in securities of junior mining companies are classified as financial assets at fair value through profit or loss and are measured at fair value. The gains or losses related to changes in fair value are reported in the consolidated income statements.

Amortized cost

Cash, certain receivables, other assets related to agreements with communities near the Peru operations, trade and other payables, long-term debt and restricted cash are classified as and measured at amortized cost and are carried at amortized cost using the effective interest rate method, less impairment losses, if any.

Non-derivative financial liabilities

Accounts payable and senior unsecured notes are initially recognized at fair value and subsequently accounted for at amortized cost, using the effective interest method. The amortization of senior unsecured notes issue costs is calculated using the effective interest rate method.

ii. Derivatives:

Derivatives are initially recognized at fair value when Hudbay becomes a party to the derivative contract and are subsequently re-measured to fair value at the end of each reporting period. The resulting gain or loss is recognized in the consolidated income statements immediately unless the derivative is designated and effective as a hedging instrument. Derivatives with positive fair value are recognized as assets; derivatives with negative fair value are recognized as liabilities.

Derivatives contracts that are entered to economically hedge a risk exposure but are not designated as a hedging instrument for hedge accounting purposes, and are physically settled, are initially and subsequently measured at fair value. Subsequent movements in fair value are recognized within the revenue line item in the consolidated income statements.

iii. Embedded derivatives:

Hudbay considers whether a contract contains an embedded derivative when it becomes a party to the contract. Derivatives embedded in other financial liabilities or other non-financial host contracts are treated as separate derivatives when their risks and characteristics are not closely related to those of the host contracts and the host contracts are not measured at FVTPL.

iv. Fair value of financial instruments:

The fair value of a financial instrument is the amount for which an asset could be exchanged, or a liability settled, between knowledgeable, willing parties in an arm's length transaction.

Fair values of financial instruments traded in active markets are determined based on quoted market prices, where available. Bid prices are generally used for assets held or liabilities to be issued; asking prices are generally used for assets to be acquired or liabilities held.

For financial instruments not traded in an active market, fair values are determined based on appropriate valuation techniques. Such techniques may include discounted cash flow analysis, using recent arm's length market transactions, reference to the current fair value of another instrument that is substantially the same, and other valuation models.

The Company applies a hierarchy to classify valuation methods used to measure financial instruments carried at fair value. Levels 1 to 3 are defined based on the degree to which fair value inputs are observable and have a significant effect on the recorded fair value, as follows:

- Level 1: Quoted prices (unadjusted) in active markets for identical assets or liabilities;

- Level 2: Valuation techniques use significant observable inputs, either directly (i.e. as prices) or indirectly (i.e. derived from prices), or valuations are based on quoted prices for similar instruments; and,

- Level 3: Valuation techniques use significant inputs that are not based on observable market data (unobservable inputs).

An analysis of fair values of financial instruments is provided in note 30.

v. Impairment of financial instruments:

Hudbay recognizes loss allowances for Expected Credit Losses ("ECL") for trade receivables not measured at FVTPL.

Loss allowances for trade receivables are measured at an amount equal to lifetime ECL. ECL is a probability-weighted estimate measured at the present value of all cash shortfalls including the impact of forward-looking information.

Hudbay has established a provision based on the Company's historical credit loss experience, adjusted for forward-looking factors specific to the debtors and the economic environment.

vi. Derecognition of financial instruments:

Hudbay derecognizes financial assets when the contractual rights to the cash flows from the assets expire, or when the Company transfers the rights to receive the contractual cash flows on the financial assets in a transaction in which substantially all the risks and rewards of ownership of the financial asset are transferred. Any interest in the transferred financial assets that is created or retained by Hudbay is recognized as a separate asset or liability.

Hudbay derecognizes financial liabilities when its contractual obligations are discharged, cancelled or expire or when its terms are modified and the cash flows of the modified liability are substantially different.

(m) Taxation:

Current Tax

Current income tax assets and liabilities for the current and prior periods are measured at the amount expected to be recovered from or paid to the taxation authorities. The tax rates and tax laws used to compute the amount are those that are enacted or substantively enacted by the balance sheet date.

Hudbay is subject to income taxes in numerous jurisdictions. Significant judgement is required in determining the worldwide provision for income taxes due to the complexity of legislation. There are many transactions and calculations for which the ultimate tax determination is uncertain during the ordinary course of business. The Company recognizes liabilities for anticipated tax issues based on estimates of whether additional taxes will be due. Where the final tax outcome of these matters is different from the amounts that were initially recorded, such differences will affect the income tax and deferred tax provisions in the period in which such determination is made.

Additionally, future changes in tax laws in the jurisdictions in which Hudbay operates could limit the ability of the Company to obtain tax deductions in future periods.

Deferred Tax

Deferred tax is recognized using the balance sheet method in respect of temporary differences at the balance sheet date between the tax basis of assets and liabilities, and their carrying amounts for financial reporting purposes.

Deferred income tax liabilities are recognized for all taxable temporary differences, except:

- where the deferred income tax liability arises from the initial recognition of goodwill, or the initial recognition of an asset or liability in a transaction that is not a business combination and, at the time of the transaction, affects neither the accounting profit nor taxable profit or loss; and - in respect of taxable temporary differences associated with investments in subsidiaries, associates and interest in joint ventures, where the timing of the reversal of the temporary differences can be controlled and it is probable that the temporary differences will not reverse in the foreseeable future.

Deferred income tax assets are recognized for all deductible temporary differences, carry-forward of unused tax assets and unused tax losses, to the extent that it is probable that taxable profit will be available against which the deductible temporary differences, and the carry-forward of unused tax assets and unused tax losses can be utilized, except:

- where the deferred income tax asset relating to the deductible temporary difference arises from the initial recognition of an asset or liability in a transaction that is not a business combination and, at the time of the transaction, affects neither the accounting profit nor taxable profit or loss; and

- in respect of deductible temporary differences associated with investments in subsidiaries, associates and interest in joint ventures, deferred tax assets are recognized only to the extent that it is probable that the temporary differences will reverse in the foreseeable future and taxable profit will be available against which the temporary differences can be utilized.

To the extent that it is probable that taxable profit will be available to offset the deductible temporary differences, Hudbay recognizes the deferred tax asset regarding the temporary difference on decommissioning, restoration and similar liabilities and recognizes the corresponding deferred tax liability regarding the temporary difference on the related assets.

The carrying amount of deferred income tax assets is reviewed at each balance sheet date and reduced to the extent that it is no longer probable that sufficient taxable profit will be available to allow all or part of the deferred income tax asset to be utilized. Unrecognized deferred income tax assets are reassessed at each balance sheet date and are recognized to the extent that it has become probable that future taxable profit will be available to allow the deferred tax asset to be recovered. 

Judgement is required in determining whether deferred tax assets are recognized on the consolidated balance sheets. Deferred tax assets, including those arising from unutilized tax losses, require management to assess the likelihood of taxable profit in future periods in order to utilize recognized deferred tax assets. Estimates of future taxable income are based on forecast cash flows from operations and the application of existing tax laws in each jurisdiction. To the extent that future cash flows and taxable income differ significantly from estimates, the ability to realize the net deferred tax assets recorded at the balance sheet date could be affected.

Deferred tax is measured on an undiscounted basis at the tax rates that are expected to apply in the periods in which the asset is realized or the liability is settled, based on tax rates and tax laws enacted or substantively enacted at the balance sheet date.

Deferred income tax assets and deferred income tax liabilities are offset if a legally enforceable right exists to offset current tax assets against current tax liabilities and the deferred income taxes relate to the same taxable entity and the same taxation authority.

Current and deferred taxes relating to items recognized outside profit or loss (whether in other comprehensive income or directly in equity) are recognized outside profit or loss and not in the consolidated income statements. Mining taxes and royalties are treated and disclosed as current and deferred taxes if they have the characteristics of an income tax.

(n) Share capital and reserves:

Transaction costs

Transaction costs directly attributable to equity transactions are recognized as a deduction from equity.

Other capital reserve

The other capital reserve is used for equity-settled share-based compensation and includes amounts for stocks options granted and not exercised.

Foreign currency translation reserve

The foreign currency translation reserve is used to record exchange differences arising from the translation of the financial statements of foreign operations. Exchange differences arising from the translation of the financial statements of foreign operations form part of the net investment in the foreign operation. Translation gains and losses remain in the reserve until disposal of all or a portion of the foreign operation.

(o) Flow-through shares

Resource expenditure deductions for income tax purposes related to exploration activities funded by flow-through share arrangements are renounced to investors under Canadian income tax legislation. On issuance, the Corporation separates the flow-through share into i) a flow-through share premium, equal to the difference between the current market price of the Corporation's common shares and the issue price of the flow-through share and ii) share capital. Upon qualifying exploration and/or development expenditures being incurred, the sale of tax deductions is recognized as other income in the income statement and the related liability is reduced. The Company may also be subject to a Part XII.6 tax on flow-through proceeds renounced, in accordance with the Canadian Income Tax Act flow-through regulations. When applicable, the estimated tax payable is accrued until paid.

(p) Share-based compensation:

Hudbay compensates its employees in part through the use of a Deferred Share Unit ("DSU") plan for non-employee members of the Board of Directors, a Restricted Share Unit ("RSU") plan for employees, a Performance Share Unit ("PSU") plan for employees and a stock option plan for employees. These plans are included in provisions on the consolidated balance sheets and further described in note 27. Changes in the fair value of the liabilities are recorded in the consolidated income statements.

Cash-settled transactions, consisting of DSUs, RSUs and PSUs, are initially measured at fair value and recognized as an obligation at the grant date. The liabilities are remeasured to fair value at each reporting date up to and including the settlement date, with changes in fair value recognized in the consolidated income statements. Hudbay values the liabilities based on the change in the Company's share price. Additional DSUs, RSUs and PSUs are credited to reflect dividends paid on Hudbay common shares over the vesting period. The current portion of the liability reflects those grants that have vested or that are expected to vest within twelve months.

DSUs vest on the grant date and are redeemable when a participant is no longer a member of the Board of Directors. Issue and redemption prices of DSUs are based on the average closing price of the Company's common shares for the five trading days prior to issuance or redemption.

RSUs and PSUs are issued under Hudbay's Long Term Equity Plan ("LTEP Plan") and vest on or before the third anniversary of the grant. RSUs and PSUs granted under the LTEP Plan may be settled in the form of the Company's common shares or, at the option of Hudbay, the cash equivalent based on the market price of the common shares as of the vesting date. Hudbay has historically settled RSUs in cash. Except in specified circumstances, RSUs and PSUs terminate when an employee ceases to be employed by the Company. Valuations of RSUs and PSUs reflect estimated forfeitures.

Equity-settled transactions with employees relate to stock options and are measured by reference to the fair value at the earlier of the grant date and the date that the employee unconditionally became entitled to the award. Fair value is determined using a Black-Scholes option pricing model, which relies on estimates of the future risk-free interest rate, future dividend payments, future share price volatility and the expected average life of the options. Hudbay believes this model adequately captures the substantive features of the option awards and is appropriate to calculate their fair values. The fair value determined at the grant date is recognized over the vesting period in accordance with vesting terms and conditions, with a corresponding increase to other capital reserves. The amount recognized as an expense is adjusted to reflect the number of awards for which the related service and non-market vesting conditions are expected to be met.

(q) Earnings per share:

The Company presents basic and diluted earnings (loss) per share ("EPS") data for its common shares. Basic EPS is calculated by dividing the profit or loss attributable to common shareholders of the Company by the weighted average number of common shares outstanding during the period. Diluted EPS is determined by adjusting the profit or loss attributable to common shareholders and the weighted average number of common shares outstanding for the effects of all dilutive potential common shares, which previously consisted of stock options granted to employees and warrants.

When calculating earnings per share for periods where the Company has a loss, Hudbay's calculation of diluted earnings per share excludes any incremental shares from the assumed conversion of stock options as they would be anti-dilutive.

(r) Leases:

Leases, under which substantially all the risks and rewards incidental to ownership of the leased item are transferred to Hudbay, are capitalized as assets at the inception of the lease at the lower of fair value or the present value of the minimum lease payments. Lease payments are apportioned between finance charges and the reduction of the liability so as to achieve a constant periodic rate of interest on the remaining balance of the liability. Finance charges are reflected in the consolidated income statements as finance costs.

Non-ROU lease payments are recognized as an expense in the consolidated income statements on a straight-line basis over the lease term.

(s) Segment reporting:

An operating segment is a component of the Company that engages in business activities from which it may earn revenue and incur expenses and for which discrete financial information is available. Hudbay's chief executive officer regularly reviews the operating results of each operating segment to make decisions about resources to be allocated to the segment and assess its performance. In determining operating segments, Hudbay considers location and decision-making authorities. Refer to note 35.

4. New standards

New standards and interpretations adopted

(a) Amendment to IAS 1 - Presentation of Financial Statements and IFRS Practice Statement 2 Making Materiality Judgements

The amendments to IAS 1 help companies provide useful accounting policy disclosures. The adoption of the new standard effective January 1, 2023 did not impact the consolidated financial statements of the Company.

(b) Amendment to IAS 12 - International Tax Reform - Pillar Two Model Rules

In May 2023, the IASB issued International Tax Reform-Pillar Two Model Rules, which amended IAS 12, Income Taxes, to introduce a temporary exception to the requirements to recognize and disclose information about deferred tax assets and liabilities related to Pillar Two income taxes, and targeted disclosure requirements for affected entities. The relief is effective immediately upon issuance of the amendments while the targeted disclosure requirements are effective for annual reporting periods beginning on or after January 1, 2023. The Company has applied the exception and is currently assessing the impact of the disclosure requirements on its consolidated financial statements.

Based on the existing revenue thresholds applicable under the Pillar Two Model Rules, the Company is within the scope of the rules as gross revenues exceed 750,000 Euros. As the legislation has not been enacted or substantively enacted in Canada, the Company continues to evaluate the impact of the legislation on its consolidated financing statements.

New standards issued but not yet effective

(c) Amendment to IAS 1 - Presentation of Financial Statements

The amendments to IAS 1 clarify that only covenants with which an entity is required to comply on or before the reporting date affect the classification of a liability as current or non-current. In addition, an entity has to disclose information in the notes that enables users of financial statements to understand the risk that non-current liabilities with covenants could become repayable within twelve months. Classification is unaffected by the expectations that the entity will exercise its right to defer settlement of a liability. Lastly, the amendments clarify that settlement refers to the transfer to the counterparty of cash, equity instruments, other assets. The amendments are effective for annual periods beginning on or after January 1, 2024. Earlier application is permitted. The Company is still assessing the impact of adoption of this amendment on its consolidated financial statements.

5. Acquisition of Copper Mountain Mining Corporation

On June 20, 2023, Hudbay acquired all of the issued and outstanding common shares of Copper Mountain, as part of a court-approved plan of arrangement. At the time, Copper Mountain held 75% of CMBC, the entity that owns 100% of the Copper Mountain mine. MMC owns the remaining 25% interest in CMBC as a non-controlling interest. As described in Note 1 above, on January 1, 2024, Hudbay amalgamated with Copper Mountain and continued as Hudbay Minerals Inc. Following the amalgamation, the Company directly holds a 75% interest in CMBC.

As a result of the acquisition, Hudbay obtained control of Copper Mountain on June 20, 2023.

Management determined that the assets and processes comprised a business and therefore accounted for the transaction as a business combination, using the acquisition method of accounting.

Consideration transferred:

The purchase consideration paid by Hudbay was for 100% of the net assets of Copper Mountain and their 100% owned subsidiaries ("100% owned entities") and a 75% ownership in CMBC. The aggregate purchase consideration for the acquired assets, net of the liabilities assumed is as follows:

The fair value of the common shares issued was based on Hudbay's listed share price of C$6.87 at the June 20, 2023 acquisition date. Immediately prior to the acquisition, Copper Mountain settled its outstanding restricted share units and performance share units through the issuance of shares and settled its stock options for replacement Hudbay options that were immediately settled in cash.

Hudbay incurred acquisition related costs of $6,932 during the year ended December 31, 2023, mainly relating to external legal and advisory fees and due diligence costs, which were recorded in other expense in the consolidated income statements. In addition, Hudbay incurred share issuance costs of $188 and presented these as a deduction from share capital.

Identifiable assets acquired and liabilities assumed:

The fair value of the net assets was determined using a combination of market, income and cost methods. The fair value of the non-controlling interest was then computed at a 25% of the equity interest in CMBC.

The following presents the allocation of the purchase price, resulting in recognized fair value amounts of identifiable assets acquired and liabilities assumed as follows: 

The fair values allocated to assets acquired and liabilities assumed previously reported as at June 30, 2023 was based on the preliminary estimates at the acquisition date and subject to change for up to one year from the acquisition date. As of  the  date  of  the  audited  annual  consolidated  financial  statements,  the  allocation  of  purchase  price  with respect  to  the  fair  value  increment  of  assets  acquired  and  liabilities  assumed  has  been  updated  to  reflect  new information obtained that existed at the acquisition date. The Company has finalized its full assessment of the fair value of net assets acquired.

The fair values of mineral properties, low grade stockpile and other property, plant and equipment have been determined based on an independent valuation, using a combination of market, income and cost methods. In particular, the fair values of the mineral properties and low grade stockpile have been calculated using significant judgements and estimates.

Trade receivables acquired as part of the acquisition have a fair value of $8,764 which is equal to their gross contractual value. Other receivables acquired have a fair value of $10,346 which is equal to their gross contractual value. Trade and other receivables are expected to be collected during the next 12 months.

Hudbay provided advances to Copper Mountain prior to the acquisition date, which have been recorded as a purchaser loan.

Hudbay recognized goodwill as a result of the acquisition as follows:

The goodwill balance arose from the requirement to record deferred income tax liabilities measured at the tax effect of the difference between the fair values of the assets acquired and liabilities assumed and their tax bases. None of the goodwill recognized is expected to be deductible for income tax purposes.

The results of operations have been consolidated with those of the Company from the date of acquisition and included in the British Columbia operating segment. Had the business combination been affected at January 1, 2023, revenue and profit of the combined entity would have been $1,824,713 and $27,406 respectively. The revenue and net profit contributed from the acquisition of Copper Mountain has been $165,438 and $13,376 respectively.

6. Acquisition of Rockcliff Metals Corporation

On September 14, 2023, Hudbay acquired all of the issued and outstanding common shares of Rockcliff, as part of a court-approved plan of arrangement. In doing so, Hudbay obtained control of Rockcliff on September 14, 2023. As described in Note 1 above, on January 1, 2024, Hudbay amalgamated with Rockcliff and continued as Hudbay Minerals Inc. Following the amalgamation, the Company directly holds all of Rockcliff's mineral properties and other assets.

Management determined that substantially all of the fair value of the gross assets acquired is concentrated in the Talbot exploration property and therefore accounted for the transaction as an asset acquisition.

The purchase consideration paid was 2,675,324 Hudbay common shares and 517,460 Hudbay warrants. For asset acquisitions settled with equity, entities are required to record the net assets acquired based on the fair value of the assets received in exchange for the equity issued, unless that fair value cannot be estimated reliably. Hudbay incurred acquisition related costs of $518 during the third quarter of 2023, mainly relating to external legal and advisory fees and due diligence costs, which were capitalized and included as a cost of acquiring the net assets.

The fair value of the net assets acquired was determined using a combination of income and cost methods. In particular, the fair values of the exploration property have been calculated using significant judgements and estimates. The following presents the fair value amounts of identifiable assets acquired and liabilities assumed: 

7. Revenue and expenses

(a) Revenue

Hudbay's revenue by significant product types:

Consideration from the Company's stream agreements is considered variable (note 21). Gold and silver stream revenue can be subject to cumulative adjustments when the amount of precious metals to be delivered under the contract changes. As a result of changes in the Company's mineral reserve and resource estimate in the first quarter of 2023, the amortization rate by which deferred revenue is drawn down into income was adjusted and, as required, a variable consideration adjustment was made for all prior year stream revenues since the stream agreement inception date. This variable consideration adjustment for the year ended December 31, 2023 resulted in an increase of revenue of $4,885 (December 31, 2022 - increase of revenue of $959).

      (b) Depreciation and amortization

Depreciation of property, plant and equipment and amortization of intangible assets are reflected in the consolidated income statements as follows:

      (c) Share-based compensation expenses

Share-based compensation expenses are reflected in the consolidated income statements as follows:

During the year ended December 31, 2023, the Company granted 801,661 stock options (year ended December 31, 2022 - 602,614). For further details on stock options, see note 27b. 

(d) Employee benefits expense

This table presents employee benefit expense recognized in the consolidated income statements,  including amounts transferred from inventory upon sale of goods:

Manitoba has a profit sharing plan required by the collective bargaining agreement whereby 10% of Manitoba's after tax profit (excluding provisions or recoveries for deferred income tax and deferred mining tax) for any given fiscal year will be distributed to all eligible employees in the Flin Flon/Snow Lake operations, with the exception of executive officers and key management personnel.

Peru has a profit sharing plan required by Peruvian law whereby 8% of Peru's taxable income will be distributed to all employees within Peru's operations.

The Company has an employee share purchase plan for executives and other eligible employees where participants may contribute between 1% and 10% of their pre-tax base salary to acquire Hudbay shares. The Company makes a matching contribution of 75% of the participant's contribution.

See note 23 for a description of Hudbay's pension plans and note 24 for Hudbay's other employee benefit plans.

      (e) Other expenses

The Flin Flon concentrator and tailings impoundment has been shifted to care and maintenance to provide optionality should another mineral discovery occur in the Flin Flon area. During the year ended December 31, 2023, care & maintenance costs were $17,081 (year ended December 30, 2022 - $9,040).

During 2023, there were costs incurred related to the restructuring of the British Columbia operations of $2,909. During the year ended December 31, 2022, there were costs incurred related to the restructuring of the Manitoba operations in preparation for the closure of 777 mine, zinc plant and Flin Flon mill of $10,609. These costs were related to activities performed in advance of the mine's expected closure in June 2022 along with ongoing restructuring, closure and severance costs.

During 2023, loss on disposition of property, plant and equipment includes the disposition of non-current assets in Peru, Copper Mountain and Manitoba.

During 2022, gains on the disposition of property, plant and equipment and other non-current assets includes the disposition of Mason's Lordsburg property, along with dispositions of non-current assets as a result of the closure of our Flin Flon operations.

During 2023, a gain of $4,226 was recorded to reflect the insurance recovery claim proceeds following a barge at Copper Mountain that sank in March 2023. As of December 31, 2023, all of the proceeds have been received.

During 2022, a gain of $5,698 was recorded to reflect the insurance recovery claim proceeds following a shaft incident at 777 in October 2020. As of December 31, 2022, all of the proceeds have been received.

During 2023, a gain of $3,859 was recorded to reflect the recovery of a value-added tax receivable that had previously been written off in Peru.

      (f) Net finance expense

Other finance expense relates primarily to standby fees on Hudbay's revolving credit facilities and leases.

      (g) Impairment loss

As a result of the Copper World Complex preliminary economic assessment released in June 2022, which contemplates the mining of the Copper World deposits and the Rosemont deposit in a two-phase mine plan, it was determined that certain capitalized costs and assets associated with the previous stand-alone development plan for the Rosemont deposit are no longer recoverable. As a result, during the second quarter of 2022, the Company recognized a pre-tax impairment loss of $94,956 related to these assets. The impairment loss was determined based on the specific identification of assets that are not expected to be recoverable under the Copper World Complex PEA. The Company presented the impairment losses within the Arizona segment in note 35. The fair value measurements used in the determination of impairment charges are categorized as level 2 based on the degree to which inputs are observable and have a significant effect on the recorded fair value.

8. Cash and cash equivalents

Cash and cash equivalents balances represent demand deposits and deposits with an original maturity date of less than 3 months.

9. Trade and other receivables

The increase in trade receivables during the year ended December 31, 2023, primarily relates to three shipments, representing approximately 30,000 tonnes of copper, which occurred late in the fiscal year and received revenue recognition but for which timing of cash receipts occur in 2024 along with the additional receivables related to Copper Mountain.

10. Inventories

The cost of inventories recognized as an expense, including depreciation, and included in cost of sales amounted to $1,159,727 for the year ended December 31, 2023 (year ended December 31, 2022 - $1,062,228).

During the year ended December 31, 2023, Hudbay recognized an expense of $2,308 in cost of sales related to adjustments of the carrying value of certain long term inventory supplies (year ended December 31, 2022 - expense of $4,110).

During the year ended December 31, 2022, Hudbay recognized a recovery of $557 in cost of sales related to adjustments of the carrying value of Peru inventories to net realizable value. Adjustments of the carrying value of inventories to net realizable value were related to changes in commodity prices.

11. Other financial assets

12. Intangibles and other assets

Intangibles and other assets of $52,453 (December 31, 2022 - $49,841) includes $48,428 of other assets (December 31, 2022 - $45,074) and $4,025 of intangibles (December 31, 2022 - $4,767).

Other assets represent the carrying value of certain future community costs that relate to agreements with communities near the Peru operations which allow Hudbay to extract or explore minerals over the useful life of Peru operations. The liability remaining for these costs is recorded in agreements with communities recorded at amortized cost (note 17). Amortization of the carrying amount is recorded in the consolidated income statements within other expenses (note 7e) or exploration expenses, depending on the nature of the agreement.

Intangibles mainly represent computer software costs. The following table summarizes changes in intangibles:

13. Goodwill

The following table summarizes changes in goodwill:

Goodwill resulted from purchase price allocation associated with the Copper Mountain acquisition (note 5).

As of December 31, 2023 all goodwill relates to the British Columbia CGU. Goodwill is tested for impairment annually on December 31 or when circumstances indicate that the carrying value may not be recoverable. Goodwill impairment is determined by assessing the recoverable amount of the CGU.

For the impairment test completed at December 31, 2023, Fair Value Less Cost of Disposal, ("FVLCD") was used to determine the recoverable amount since it is higher than value in use. FVLCD was calculated using discounted after-tax cash flows based on cash flow projections and assumptions in Hudbay's most current LOM. The fair value measurement in its entirety is categorized as Level 3 based on the degree to which fair value inputs are observable and have a significant effect on the recorded fair value. LOM plans are based on optimized mine and processing plans and the assessment of capital expenditure requirements of a mine site.

Management used judgement in determining estimates and assumptions with respect to discount rates, future production levels including amounts of recoverable reserves, resources and exploration potential, operating and capital costs, long-term metal prices, value of mineral resources not included in the LOM plan and future foreign exchange rates. Metal pricing assumptions were based on consensus forecast pricing, and the discount rates were based on a weighted average cost of capital, adjusted for country risk and other risks specific to the CGU. Cash flows were projected through to 2043. Changes in any of the assumptions or estimates used in determining the fair values could impact the impairment analysis.

The discount rate was based on the CGU's weighted average cost of capital, of which the two main components are the cost of equity and the after-tax cost of debt. Cost of equity was calculated based on the capital asset pricing model, incorporating the risk-free rate of return based on the Canadian Government's marketable bond yields as at the valuation date, the Company's beta coefficient adjustment to the market equity risk premium based on the volatility of the Company's return in relation to that of a comparable market portfolio, plus a country risk premium, size premium and company-specific risk factor. Cost of debt was determined by applying an appropriate market indication of the Company's borrowing capabilities and the corporate income tax rate applicable to the segment's jurisdiction. A real discount rate of 7.25% for the British Columbia CGU was used to calculate the estimated after- tax discounted future net cash flows, commensurate with its individual estimated level of risk.

Commodity prices used in the impairment assessment were determined by reference to external market participant sources. The key commodity price for this assessment is the price of copper. The cash flow calculations were based on estimates of future production levels applying forecasts for metal prices, which included forecasts for each year from 2024 to 2028 and long-term forecasts for years beginning in 2029. The cash flow calculations utilized a copper price of $3.75/lb starting in 2024. The cash flow calculations utilized a long-term copper price of $4.00/lb, and capital, operating and reclamation costs based on the most current LOM plans. A value of $311,000 was utilized to estimate the value of mineral resources not included in the LOM plan.

Expected future cash flows used to determine the FVLCD in the impairment test are inherently uncertain and could materially change over time. The Company has conducted an analysis of the sensitivity of the impairment test to changes in the key assumptions used to determine the recoverable amount for the CGUs to which goodwill is allocated. Management believes that any reasonably possible change in the key assumptions on which the recoverable amount is based would not cause the aggregate carrying amount to exceed the aggregate recoverable amount of the related CGU. 

The estimated recoverable amount of the British Columbia CGU including goodwill exceeded its carrying amount as at December 31, 2023, accordingly no impairment was recorded.

14. Property, plant and equipment

1 Includes $5,413 of capital works in progress - ROU assets (costs) that relate to the Arizona business unit.

An indicator of impairment was identified in the first quarter of 2023 as a result of an updated life of mine ("LOM") plan for Peru which included updated costs reflecting recently experienced inflationary pressures. As such, management determined that a detailed impairment evaluation as at March 31, 2023 was required for the Peru CGU.

For the impairment test completed at March 31, 2023, FVLCD was used to determine the recoverable amount since it is higher than value in use. FVLCD was calculated using discounted after-tax cash flows based on cash flow projections and assumptions in Hudbay's most current LOM. The fair value measurement in its entirety is categorized as Level 3 based on the degree to which fair value inputs are observable and have a significant effect on the recorded fair value. 

LOM plans are based on optimized mine and processing plans and the assessment of capital expenditure requirements of a mine site. LOM plans incorporate management's best estimates of key assumptions which are discount rates, future commodity prices, production based on current estimates of recoverable reserves, future operating and capital costs, value of mineral resources not included in the LOM plan and future foreign exchange rates. The cash flows are for periods up to the date that production is expected to cease, which is 16 years for the Peru CGU.

The discount rate was based on the CGU's weighted average cost of capital, of which the two main components are the cost of equity and the after-tax cost of debt. Cost of equity was calculated based on the capital asset pricing model, incorporating the risk-free rate of return based on the US Government's marketable bond yields as at the valuation date, the Company's beta coefficient adjustment to the market equity risk premium based on the volatility of the Company's return in relation to that of a comparable market portfolio, plus a country risk premium, size premium and company-specific risk factor. Cost of debt was determined by applying an appropriate market indication of the Company's borrowing capabilities and the  corporate income tax rate applicable to the segment's jurisdiction. A real discount rate of 7.00% for the Peru CGU was used to calculate the estimated after- tax discounted future net cash flows, commensurate with its individual estimated level of risk.

Commodity prices used in the impairment assessment were determined by reference to external market participant sources. The key commodity price for this assessment is the price of copper. Where applicable to each of the Group's CGUs, the cash flow calculations were based on estimates of future production levels applying forecasts for metal prices, which included forecasts for each year from 2023 to 2027 and long-term forecasts for years beginning in 2028. The cash flow calculations utilized a copper price of $3.75/lb starting in 2023. The cash flow calculations utilized a long-term copper price of $3.75/lb, and capital, operating and reclamation costs based on the most current LOM plans. A value of $210,000 was utilized to estimate the value of mineral resources not included in the LOM plan.

Expected future cash flows used to determine the FVLCD used in the impairment testing are inherently uncertain and could materially change over time. Should management's estimate of the future not reflect actual events, impairments may be identified. This may have a material effect on the Company's financial statements. Although it is reasonably possible for a change in key assumptions to occur, the possible effects of a change in any single assumption may not fairly reflect the impact on a CGU's fair value as the assumptions are inextricably linked. For example, a decrease in the assumed price of long-term copper could result in amendments to the mine plans which would partially offset the effect of lower prices. It is difficult to determine how all of these factors would interrelate; however, in deriving a recoverable amount, management believes all of these factors need to be considered. As of March 31, 2023, a reasonably possible change in one of the key assumptions, all else being equal, may cause the carrying value to exceed the recoverable amount.

Management determined that the fair value less cost to dispose exceeded the carrying value of the Peru CGU, accordingly no impairment was recorded.

At December 31, 2022, capital works in progress decreased compared to December 31, 2021 as a result of a pre-tax impairment charge of $94,956 related to certain capitalized costs and assets associated with the previous stand-alone development plan for the East deposit that are no longer recoverable (see note 7g).

The closure of the Flin Flon operations in the second quarter of 2022 has led to the derecognition of fully depreciated assets. This resulted in a decrease in both the cost and accumulated depreciation of the Mining Properties and Plant and Equipment categories.

An indicator of impairment was identified in the second quarter of 2022 as a result of the recently released PEA and new mine plan for the Copper World Complex in Arizona. As such, management determined that a detailed impairment evaluation as at June 30, 2022 was required for the Arizona CGU. Management determined that the fair value less cost to dispose exceeded the carrying value of the Arizona CGU, accordingly no impairment was recorded.

15. Trade and other payables

  Accruals and payables include operational and capital costs and employee benefit amounts owing.

16. Other liabilities

17. Other financial liabilities

Agreements with communities recorded at amortized cost relate to agreements with communities near the Constancia operation which allow Hudbay to extract minerals over the useful life of the Constancia operation, carry out exploration and evaluation activities in the area and provide Hudbay with community support to operate in the region. The changes in agreements with communities recorded at amortized cost during the year ended December 31, 2023 primarily relates to updates to existing land user agreements with certain community members, changes in estimates, the accretion of the liability net of disbursements.  The changes in agreements with communities recorded at amortized cost during the year ended December 31, 2022 primarily relates to the execution of the exploration agreement with the community of Uchucarcco which provides surface rights to the Maria Reyna and Caballito satellite properties located near the Constancia operation, partially offset by disbursements, which were primarily all paid in 2022.

The following table summarizes changes in agreements with communities recorded at amortized cost:

18. Gold prepayment liability

        Gold prepayment liabilities are reflected in the consolidated balance sheets as follows:

The following table summarizes changes in the gold prepayment liability:

During the first quarter of 2023, Hudbay renegotiated its agreements with various financial institutions and deferred eight months of scheduled gold deliveries. Monthly deliveries of the outstanding gold ounces under the new agreements have resumed in October 2023 and will continue until August 2024.

19. Lease liabilities

Lease liabilities are reflected in the consolidated balance sheets as follows:

Hudbay has entered into leases which expire between 2024 and 2037. The interest rates on leases which were capitalized have interest rates between 2.39% and 8.49%, per annum. The range of interest rates utilized for discounting varies depending mostly on the Hudbay entity acting as lessee and duration of the lease. For certain leases, Hudbay has the option to purchase the equipment and vehicles leased at the end of the terms of the leases. Hudbay's obligations under these leases are secured by the lessor's title to the leased assets. The present value of applicable lease payments has been recognized as an ROU asset, which was included as a non-cash addition to property, plant and equipment, and a corresponding amount as a lease liability.

There are no restrictions placed on Hudbay by entering into these leases.

The following outlines expenses recognized within the Company's consolidated income statements, relating to leases for which a recognition exemption was applied.

Payments made for short-term, low value and variable leases would mostly be captured as expenses in the consolidated income statements, however, certain amounts may be capitalized to PP&E for the Arizona segment during its development phase and certain amounts may be reported in inventories given the timing of sales. Variable payment leases include equipment used for heavy civil works at Constancia.

20. Long-term debt

Long-term debt is comprised of the following:

(a) Senior unsecured notes

As at December 31, 2023, $1,200,000 aggregate principal amount of senior notes were outstanding in two series: (i) a series of 4.50% senior notes due 2026 in an aggregate principal amount of $600,000 and (ii) a series of 6.125% senior notes due 2029 in an aggregate principal amount of $600,000.

The senior notes are guaranteed on a senior unsecured basis by substantially all of the Company's subsidiaries, other than HudBay (BVI) Inc. and certain excluded or unrestricted subsidiaries, which includes CMBC (the Company's 75% owned subsidiary that owns the Copper Mountain mine), and subsidiaries that hold the Copper World and Mason projects as well as any newly formed or acquired subsidiaries that primarily hold or may develop non-producing mineral assets that are in the pre-construction phase of development.

(b) Senior secured revolving credit facilities

Hudbay has two senior secured revolving credit facilities with total commitments of $450 million and substantially similar terms and conditions for its Canadian and Peruvian businesses. Hudbay's revolving credit facilities are secured against substantially all of the Company's assets, other than those associated with the Copper Mountain mine and the Arizona business unit.

During the year ended December 31, 2023, Hudbay drew an aggregate of $220,000 and repaid an aggregate of $120,000 under its Canadian revolving credit facility.

At December 31, 2023, we had $10,000 and $90,000 of debt outstanding under our Canadian and Peruvian revolving credit facilities, respectively. The Company may repay any borrowings under the revolving credit facility at any time without premium or penalty.

As at December 31, 2023, the Peru segment had nil in letters of credit issued under the Peru revolving credit facility to support its reclamation obligations and the Manitoba segment had $26,144 in letters of credit issued under the Canadian revolving credit facility to support its reclamation and pension obligations. As at December 31, 2023, we were in compliance with our covenants under the revolving credit facilities.

Surety bonds

The Arizona segment had $12,966 in surety bonds issued to support future reclamation and closure obligations. No cash collateral is required to be posted under these surety bonds.

The British Columbia segment had $15,925 in surety bonds issued to support future reclamation and closure obligations and $5,013 in surety bonds with BC Hydro in relation to the BC Hydro transmission system at the Copper Mountain Mine. No cash collateral is required to be posted under these surety bonds.

Other letters of credit

The Peru segment had $118,048 in letters of credit issued with various Peruvian financial institutions to support future reclamation and other operating matters. No cash collateral is required to be posted under these letters of credit.

On August 22, 2022, Hudbay closed a C$130.0 million bilateral letter of credit facility ("LC Facility") with a major Canadian financial institution. As at December 31, 2023, the Manitoba segment had $56,652 in letters of credit issued under the LC Facility to support its reclamation and pension obligations.

(c) Copper Mountain Bonds

On April 9, 2021, Copper Mountain completed an offering of $250,000 million of secured bonds ("the Bonds") bearing an annual interest rate of 8.0% with a maturity date of April 9, 2026.

With the acquisition of Copper Mountain on June 20, 2023, a change of control event was triggered and $83,307 of the Bonds were put to Copper Mountain on July 17, 2023 at a price of 101%, plus accrued interest. The principal and premium amounted to $84,140, which was repaid on July 24, 2023.

During the fourth quarter of 2023, Hudbay made a scheduled principal repayment of $5,000 and exercised the early redemption option and redeemed the remaining $54,696 principal amount outstanding of Copper Mountain Bonds on November 30, 2023 at a call price of 104%, plus accrued and unpaid interest to the date of redemption.

21. Deferred revenue

Peru Stream Agreement

For the year ended December 31, 2023, the drawdown rates for the Peru stream agreement for gold and silver were $820 and $15.26 per ounce, respectively (year ended December 31, 2022 - $734 and $14.95 per ounce, respectively).

777 Stream Agreement

As of September 30, 2022 all of 777's precious metals reserves and inventory levels have been depleted and we expect no further drawdown of deferred revenue. 

As part of the streaming agreement for the 777 mine, Hudbay must repay, with precious metals credits, the stream deposit by August 1, 2052, the expiry date of the agreement. If the stream deposit is not fully repaid with precious metals credits from 777 production by the expiry date, a payment for the remaining amount will be due at the expiry date of the agreement. As the 777 mine has concluded all mining activities following the depletion of reserves and finalized the sales of produced concentrate, Hudbay concluded that the remaining stream deposit will not be repaid by means of precious metals credits from 777 production. The repayment amount is recorded as a Wheaton refund liability (note 17), which is and will be discounted at the 9.0% rate inherent in the original 777 stream agreement and accreted over the remaining term of the agreement.

The following table summarizes changes in deferred revenue:

Consideration from the Company's stream agreement is considered variable. Gold and silver stream revenue can be subject to cumulative adjustments when the number of ounces to be delivered under the contract changes. As a result of changes in the Company's mineral reserve and resource estimate in the first quarter of 2023, the amortization rate by which deferred revenue is drawn down into income was adjusted and, as required, a current period variable adjustment was made for all prior period stream revenues since the stream agreement inception date. This variable consideration adjustment resulted in an increase in revenue of $4,885 and a decrease of finance expense of $96 for the year ended December 31, 2023 (December 31, 2022 - increase in revenue of $959 and a decrease of finance expense of $940).

Deferred revenue is reflected in the consolidated balance sheets as follows:

22. Environmental and other provisions

1 Certain amounts relating to the Arizona segment are capitalized.

2 Relates primarily to flow-through share premiums, restructuring costs and other non-capital provisions.

3 Please refer to note 27a for further information.

Provisions are reflected in the consolidated balance sheets as follows:

1 Certain amounts relating to the Arizona segment are capitalized.

2 Relates primarily to restructuring costs and other non-capital provisions.

3 Please refer to note 27a for further information.

Decommissioning, restoration and similar liabilities are remeasured at each reporting date to reflect changes in discount rates, which can significantly affect the liabilities.

Decommissioning, restoration and similar liabilities ("DRO")

Hudbay's decommissioning, restoration and similar liabilities relate to the rehabilitation and closure of currently operating mines and metallurgical plants, development-phase properties and closed properties. The amount of the provision has been recorded based on estimates and assumptions that management believes are reasonable; however, actual decommissioning and restoration costs may differ from expectations.

DRO are remeasured at each reporting date to reflect changes in discount rates, inflation, exchange rates, and timing and extent of cash outflows which can significantly affect the liabilities. The amount of this provision has been recorded based on estimates and assumptions that management believes are reasonable; however, actual decommissioning and restoration costs may differ from expectations.

During the year ended December 31, 2023, the Company recorded a non-cash gain of $11,416 in the consolidated income statements mainly related to a revaluation adjustment of Flin Flon's environmental reclamation provision (December 31, 2022 - $133,460). This was primarily caused by a general increase in long term, risk-free discount rates during 2023 based on movements in Canadian bond yields. Typically, an operating site will reflect any revaluation adjustments of its environmental reclamation provision against its reclamation assets. However, since the Flin Flon operations closed in June 2022, the corresponding Flin Flon assets have been fully depreciated and cannot be reduced below their residual value, resulting in the remaining impact being recorded as a non-cash gain in re-evaluation adjustment - environmental provision in the consolidated income statements.

Hudbay's decommissioning and restoration liabilities relate mainly to its Manitoba, Peru and British Columbia operations. Management has placed the remaining Flin Flon assets on care and maintenance. The majority of closure activities will occur once all mining activities in Manitoba are completed. These provisions also reflect estimated post-closure cash flows that extend to the year 2123 for ongoing monitoring and water treatment requirements. Management anticipates most decommissioning and restoration activities for the Peru operation will occur from 2035 to 2103, which include ongoing monitoring and water treatment requirements. Management anticipates most decommissioning and restoration activities for the British Columbia operation will occur from 2041 to 2142, which include ongoing monitoring and water treatment requirements.

As at December 31, 2023, decommissioning, restoration and similar liabilities have been discounted to their present value at rates ranging from 3.01% to 4.86% per annum (December 31, 2022 - 3.26% to 4.75%), using pre-tax, risk-free interest rates that reflect the estimated maturity of each specific liability.

23. Pension obligations

Hudbay maintains non-contributory and contributory defined benefit pension plans for certain of its employees.

The Company uses a December 31 measurement date for all of its plans. For Hudbay's significant plans, the most recent actuarial valuations filed for funding purposes were performed during 2023 using the latest data available as at December 31, 2022. For these plans, the next actuarial valuation required for funding purposes will be performed during 2024 using the data as of December 31, 2023.

During 2023, an annuity purchase transaction was entered into in which the defined benefit obligations associated with certain defined benefit plan members were assumed by a third-party insurer in exchange for a lump sum payment of $34,857 from plan assets.

Movements in the present value of the defined benefit obligation in the current and previous years were as follows:

The defined benefit obligation closing balance, by member group, is as follows:

Movements in the fair value of the pension plan assets in the current and previous years were as follows:

The amount included in the consolidated balance sheets arising from the entity's obligation in respect of its defined benefit plans is as follows:

Reflected in the consolidated balance sheets as follows:

Pension expense is as follows:

Remeasurement on the net defined benefit liability:

Pension amounts recognized include those directly related to production of inventory; such amounts are recognized initially as costs of inventory and are expensed in the consolidated income statements within cost of sales upon sale of the inventory.

The current service cost, the interest cost and administration cost for the year are included in the employee benefits expense. The remeasurement of the net defined benefit liability is included in OCI.

The defined benefit pension plans typically expose Hudbay to actuarial risks such as: investment risk, interest rate risk, longevity risk and salary risk.

The principal assumptions used for the purposes of the actuarial valuations were as follows: