Hudbay Minerals (HBM) 40-F 31 Mar 20 2019 FY Annual report (Canada) Financial data

Document and Entity Information

Document and Entity Information	12 Months Ended
	Dec. 31, 2019shares
Document and Entity Information [Abstract]
Entity Registrant Name	Hudbay Minerals Inc.
Entity Central Index Key	0001322422
Entity Current Reporting Status	Yes
Document Type	40-F
Document Period End Date	Dec. 31, 2019
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Entity Common Stock, Shares Outstanding	261,272,151
Amendment Flag	false
Entity Emerging Growth Company	false

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 396,146	$ 515,497
Trade and other receivables	105,994	117,153
Inventories	138,820	118,474
Prepaid expenses and other current assets	12,737	8,894
Other financial assets	2,049	10,366
Taxes receivable	7,289	2,008
Total Current assets	663,035	772,392
Receivables	19,264	39,121
Inventories	19,455	19,476
Other financial assets	11,287	15,159
Intangibles and other assets	10,411	4,162
Property, plant and equipment	3,662,559	3,819,812
Deferred tax assets	69,950	15,513
Total Assets	4,455,961	4,685,635
Current liabilities
Trade and other payables	192,404	171,952
Taxes payable	2,146	5,508
Other liabilities	49,411	30,551
Other financial liabilities	28,076	12,425
Lease liabilities	32,781	20,472
Deferred revenue	86,933	86,256
Total Current liabilities	391,751	327,164
Other financial liabilities	39,784	18,771
Lease liabilities	49,166	53,763
Long-term debt	985,255	981,030
Deferred revenue	476,823	479,822
Provisions	280,850	204,648
Pension obligations	29,599	23,863
Other employee benefits	116,778	93,628
Deferred tax liabilities	237,832	324,090
Total liabilities	2,607,838	2,506,779
Equity
Share capital	1,777,340	1,777,340
Reserves	(24,250)	(41,254)
Retained earnings	95,033	442,770
Total equity	1,848,123	2,178,856
Total liabilities and equity	$ 4,455,961	$ 4,685,635

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Cash generated from operating activities:
(Loss) profit for the year	$ (343,810)	$ 85,416
Tax (recovery) expense	(108,953)	85,421
Items not affecting cash:
Depreciation and amortization	346,634	333,144
Share-based payment expenses (recoveries)	2,714	(2,373)
Finance expense, net	154,361	143,550
Change in fair value of derivatives	3,708	(1,514)
Impairment loss	322,249
Amortization of deferred revenue	(76,103)	(93,382)
Unrealized gain on warrants		(6,748)
Loss on investments	4,539	3,798
Pension and other employee benefit payments, net of accruals	2,148	(94)
Write down of UCM receivable	25,978
Other and foreign exchange	672	(8,571)
Taxes paid	(26,853)	(37,295)
Operating cash flow before change in non-cash working capital	307,284	501,352
Change in non-cash working capital	3,572	(21,800)
Net cash flows from (used in) operating activities	310,856	479,552
Cash used in investing activities:
Acquisition of property, plant and equipment	(259,202)	(190,899)
Proceeds from disposal of investments		53
Acquisition of Mason		(19,050)
Acquisition of subsidiary, net of cash acquired	(44,688)	4,224
Change in restricted cash	3,401	(3,196)
Net interest received	8,119	6,732
Net cash flows from (used in) investing activities	(292,370)	(202,136)
Cash used in financing activities:
Interest paid on long-term debt	(74,750)	(74,750)
Financing costs	(26,149)	(20,564)
Lease payments	(32,952)	(20,926)
Net proceeds from equity transactions		(69)
Dividends paid	(3,927)	(4,045)
Net cash flows from (used in) financing activities	(137,778)	(120,354)
Effect of movement in exchange rates on cash and cash equivalents	(59)	1,936
Net (decrease) increase in cash and cash equivalents	(119,351)	158,998
Cash and cash equivalents, beginning of the year	515,497	356,499
Cash and cash equivalents, end of the year	$ 396,146	$ 515,497

Consolidated Income Statements

Consolidated Income Statements - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income Statement
Revenue	$ 1,237,439	$ 1,472,366
Cost of sales
Mine operating costs	741,342	765,959
Depreciation and amortization	344,555	332,667
Cost of sales	1,085,897	1,098,626
Gross profit	151,542	373,740
Selling and administrative expenses	36,170	27,243
Exploration and evaluation expenses	30,774	28,570
Other operating expenses	51,116	19,071
Impairment loss	322,249
Results from operating activities	(288,767)	298,856
Finance income	(8,527)	(8,450)
Finance expenses	162,888	152,000
Other finance loss (gains)	9,635	(15,531)
Net finance expense	163,996	128,019
(Loss) profit before tax	(452,763)	170,837
Tax (recovery) expense	(108,953)	85,421
(Loss) profit for the year	$ (343,810)	$ 85,416
(Loss) earnings per share
Basic and diluted (in dollars per share)	$ (1.32)	$ 0.33
Weighted average number of common shares outstanding:
Basic and diluted (in shares)	261,272,151	261,271,621

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Statement of Income and Comprehensive Income
(Loss) profit for the year	$ (343,810)	$ 85,416
Recognized directly in equity:
Net gain (loss) on translation of foreign currency balances	9,220	(24,371)
Total other comprehensive income that will be reclassified to profit or loss, net of tax	9,220	(24,371)
Recognized directly in equity:
Remeasurement - actuarial (loss) gain	(20,072)	9,060
Tax effect	1,878	520
Total other comprehensive income that will not be reclassified to profit or loss, net of tax	(18,194)	9,580
Other comprehensive loss net of tax, for the year	(8,974)	(14,791)
Total comprehensive loss for the year	$ (352,784)	$ 70,625

Consolidated Statements of Chan

Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Share capital [Member]	Other capital reserves [Member]	Foreign currency translation reserve [Member]	Remeasurement reserve [Member]	Retained earnings [Member]	Total
Beginning Balance at Dec. 31, 2017	$ 1,777,409	$ 28,837	$ 12,552	$ (67,852)	$ 361,399	$ 2,112,345
Statements [Line Items]
Profit (Loss)					85,416	85,416
Other comprehensive income (loss)			(24,371)	9,580		(14,791)
Total comprehensive income (loss)			(24,371)	9,580	85,416	70,625
Contributions by and distributions to owners:
Stock options exercised	(80)					(80)
Warrants exercised	11					11
Dividends					(4,045)	(4,045)
Total contributions by and distributions to owners	(69)				(4,045)	(4,114)
Ending Balance at Dec. 31, 2018	1,777,340	28,837	(11,819)	(58,272)	442,770	2,178,856
Statements [Line Items]
Profit (Loss)					(343,810)	(343,810)
Other comprehensive income (loss)			9,220	(18,194)		(8,974)
Total comprehensive income (loss)			9,220	(18,194)	(343,810)	(352,784)
Dilution of Partner's interest in Rosemont		25,978				25,978
Contributions by and distributions to owners:
Warrants exercised	0					0
Dividends					(3,927)	(3,927)
Total contributions by and distributions to owners					(3,927)	(3,927)
Ending Balance at Dec. 31, 2019	$ 1,777,340	$ 54,815	$ (2,599)	$ (76,466)	$ 95,033	$ 1,848,123

Reporting entity

Reporting entity	12 Months Ended
	Dec. 31, 2019
Disclosure Of Corporate Information [Abstract]
Reporting entity [Text Block]	1. Reporting entity On January 1, 2017, Hudbay Minerals Inc. amalgamated under the Canada Business Corporations Act Wholly owned subsidiaries as at December 31, 2019 include HudBay Marketing & Sales Inc. ("HMS"), HudBay Peru Inc., HudBay Peru S.A.C. ("Hudbay Peru"), HudBay (BVI) Inc., Hudbay Arizona Inc, Rosemont Copper Company ("Rosemont") and Mason Resources (US) Inc ("Mason"). Hudbay is an integrated mining company primarily producing copper concentrate (containing copper, gold and silver), molybdenum concentrate and zinc metal. With assets in North and South America, the Group is focused on the discovery, production and marketing of base and precious metals. Directly and through its subsidiaries, Hudbay owns three polymetallic mines, four ore concentrators and a zinc production facility in northern Manitoba and Saskatchewan (Canada) and Cusco (Peru) and copper projects in Arizona and Nevada (United States). The Group also has equity investments in a number of junior exploration companies. 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.

Basis of preparation

Basis of preparation	12 Months Ended
	Dec. 31, 2019
Basis Of Presentation [Abstract]
Basis of preparation [Text Block]	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, 2019. The Board of Directors approved these consolidated financial statements on February 20, 2020. (b) Functional and presentation currency: The Group'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 business unit, which has 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: - - - (d) Use of judgements and estimates: The preparation of the consolidated financial statements in conformity with IFRS requires the Group 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. The Group reviews these estimates and underlying assumptions on an ongoing basis, based on experience and other factors, including expectations of future events that the Group believe 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 - IFRS 15 - Revenue - adoption for stream transactions - Changes in the mineral reserve or resource estimates may affect: - - - - - - Property plant and equipment the carrying amounts of property, plant and equipment and exploration and evaluation assets on the Group'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, the Group 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. - Acquisition method accou nting he acquisition of UCM's 7.95% interest in the Rosemont project, judgement was required to determine if the acquisition represented a business combination or an asset purchase. Since it was concluded that the acquisition represented the purchase of assets, there was no goodwill generated on the transaction and acquisition costs were capitalized to the assets purchased rather than expensed. - Tax provisions nagement 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 the 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 inventor ies ying 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 obligation s ( 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 to determine the extent 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. - Pensions and other employee benefits ement obligations relate mainly to ongoing health care benefits plans. The Group 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, a 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, the Group 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 the Group bases future salary increases and pension increases on expected future inflation rates for the respective country.

Significant accounting policies

Significant accounting policies	12 Months Ended
	Dec. 31, 2019
Significant Accounting Policies [Abstract]
Significant accounting policies [Text Block]	3. Significant accounting policies The accounting policies set out below have been applied consistently to all periods presented in these consolidated financial statements and by all Group entities. (a) Basis of consolidation: Intercompany balances and transactions are eliminated upon consolidation. When a Group entity transacts with an associate or jointly controlled entity of the Group, unrealized profits and losses are eliminated to the extent of the Group's interest in the relevant associate or joint venture. The accounting policies of Group entities are changed when necessary to align them with the policies adopted by the Company. Subsidiaries A subsidiary is an entity controlled by the Group. The financial statements of subsidiaries are included in the consolidated financial statements from the date that control commences until the date that control ceases. Business combinations and goodwill When the Group makes 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. The Group 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 interests 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 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 Group's previously held interests in the acquired entity are remeasured to fair value at the acquisition date, which is the date the Group 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 interests 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 the Group'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. An impairment loss in respect of goodwill is not reversed. Fair value for mineral interests 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 the Group's continued use and cannot take into account future development. The weighted average cost of capital of the Group 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, the Group 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 Group 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 Group 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 noon 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 Group entities that have functional currencies other than the US dollar are translated to US dollars at the reporting date using the noon 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 interests. 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 from the sale of goods is measured at the fair value of the consideration received or receivable, net of treatment and refining charges and pre-production revenue. Revenue from the sale of by-products is included within revenue. Sales revenue is recognized when control of the goods sold has been transferred to the buyer. Control is deemed to have passed to the customer when significant risk and reward of the product has passed to the buyer, Hudbay has a present right to payment and physical possession of the product has been transferred to the buyer. 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. Incoterms used by Hudbay Revenue recognized when goods: Cost, Insurance and Freight (CIF) Are loaded on board the vessel Free on Board (FOB) Are loaded on board the vessel Delivered at place (DAP) Arrive at the named place of destination Delivered at terminal (DAT) Arrive at the named place of destination Free Carrier (FCA) Arrive at the named place of delivery Sales of 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, 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 may revisit its revenue recognition policy. The Group 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 stand alone selling basis to any separate performance obligations and are recognized over the period of time the goods sold are shipped, on a gross basis. The Group recognizes deferred revenue in the event it receives payments from customers before a sale meets criteria for revenue recognition. There is a significant financing component associated with the Group's precious metal streaming arrangements 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 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 payments and other indirect expenses related to producing operations. (e) 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 are classified as non-current assets and presented in restricted cash on the consolidated balance sheets. Changes in restricted cash balances are classified as investing activities on the consolidated statements of cash flows. (f) Inventories consist of stockpiles, in-process inventory (concentrates and metals), metal products and supplies. Concentrates, 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 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. 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: 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. A regular review is undertaken to determine the extent of any provision for obsolescence. (g) Computer software is measured at cost less accumulated amortization and accumulated impairment losses. Costs include all directly attributable costs necessary to create, produce and prepare the asset to be capable of operating it in the manner intended by management. Amortization methods, useful lives, and residual values if any, are reviewed at each year end and adjusted prospectively, if required. When an intangible asset is disposed of, or when no further economic benefits are expected, the asset is derecognized, and any resulting gain or loss is recorded in the consolidated income statements. Currently, the Group's intangible assets relate primarily to enterprise resource planning ("ERP") information systems, which are amortized over their estimated useful lives. (h) Exploration and evaluation expenditures: Exploration and evaluation activity begins when the Group 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 interests in mineral rights, licenses and properties and the costs of the Group's exploration activities, such as researching and analyzing existing exploration data, gathering data through geological studies, exploratory drilling, trenching, sampling, and certain feasibility studies. The Group expenses the cost of its exploration and evaluation activities and capitalizes the cost of acquiring interests 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. The Group 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. The Group monitors exploration and evaluation assets for factors that may indicate their carrying amounts are not recoverable. If such indicators are identified, the Group tests the exploration and evaluation assets or their CGUs, as applicable, for impairment. The Group also tests 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 Group determines that probable future economic benefits will be generated as a result of the expenditures. The Group'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. (i) The Group 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 for which the Group 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 revenue earned in the process of preparing an asset to be capable of operating in the manner intended by management is included in the cost of the constructed asset. Any other incidental revenue earned prior to commencement of commercial production is recognized in the consolidated income statements. Carrying amounts of property, plant and equipment, including assets under finance leases, 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 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 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. 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 consists of buildings and fixtures, surface and underground fixed and mobile equipment and assets under finance 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) The Group has applied IFRS 16 using the modified retrospective approach. The impact of the changes in disclosed in Note 4. At inception of a contract, the Group 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 group assesses the following criteria in the determination of whether a contract conveys the right to control the use of an identified asset: • • • • • The Group has applied this approach to contracts entered into or changed on or after January 1, 2019. The Group's approach to other contracts is explained in Note 4. The Group recognizes a right-of-use ("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, the Group's incremental borrowing rate. Generally, the Group uses its incremental borrowing rate as the discount rate. Lease payments included in the measurement of the lease liability comprise fixed payments including insubstance 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 the Group reasonably expects to incur due to purchase options, extension options and termination options reasonably expected to be exercised. The lease liability is measured at amortised 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. The Group 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 Group has elected not to recognise 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. The Group recognizes the lease payments associated with these leases as an expense on a straight-line basis over the lease term. The Group does not enter into transactions where the Group acts as a lessor. The incremental borrowing rate used for new ROU leases as at January 1, 2019 and going forward which are required to incorporate assessments of asset specific attributes such as quality and location is a key management judgement. (v) • • • • • • • The Group reviews its depreciation methods, remaining useful lives and residual values at least annually and accounts for changes in estimates prospectively. (vi) 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. The Group considers a range of factors when determining the level of activity that represents commercial production for a particular project, including a pre-determined 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) The Group 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 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 the Group during the period, to a maximum of actual borrowing costs incurred. Investment income earned by temporarily investing specific borro

New standards

New standards	12 Months Ended
	Dec. 31, 2019
Disclosure of changes in accounting estimates [abstract]
New standards [Text Block]	4. New standards New standards and interpretations adopted (a) IFRS 16, Leases ("IFRS 16") In January 2016, the IASB issued this standard which is effective for periods beginning on or after January 1, 2019, replaces the current guidance in IAS 17, Leases ("IAS 17"), and is to be applied either retrospectively or using a modified retrospective approach. Under IAS 17, lessees were required to make a distinction between a finance lease (on balance sheet) and an operating lease (off balance sheet). IFRS 16 now requires lessees to recognize a lease liability reflective of future lease payments and a "right-of-use asset" for virtually all lease contracts, which has caused, with limited exceptions, most leases to be recorded on balance sheet. The Group has selected the modified retrospective approach. Therefore, the cumulative effect of adopting IFRS 16 has been recognized as an adjustment to the January 1, 2019 balance for property, plant and equipment and lease liabilities. There was no retained earnings impact , as the Group elected to set the re-valued ROU assets equal to their lease liabilities. The Group applied the practical expedient to grandfather the definition of a lease on transition. This means that it will apply IFRS 16 to all contracts entered into before January 1, 2019 and identified as leases in accordance with IAS 17 and IFRIC 4. On the transition date of January 1, 2019, former operating leases have been recognized on the consolidated balance sheet, which has increased liabilities and property, plant and equipment balances. As a result of recognizing the former operating leases, this has reduced cost of sales, as previously recorded operating lease expense has been replaced by depreciation expense and finance expense. (b) Lease standard adopted - Impact Summary Consolidated Balance Sheet As reported December 31, 2018 Adjustment Revised opening balance, January 1, 2019 Property, plant & equipment, carrying value $ 3,819,812 $ 14,980 $ 3,834,792 Lease Liability (current) 20,472 4,949 25,421 Lease Liability (non-current) 53,763 10,031 63,794 On transition to IFRS 16, the Group recognized an additional $14,980 of right of use assets and lease liabilities. When measuring lease liabilities, the Group discounted lease payments using the incremental borrowing rate at January 1, 2019. The range of interest rates utilized for discounting varies depending mostly on the Hudbay Group entity acting as lessee and duration of the lease; rates ranged from 1.95% to 5.13%, per annum. For the transition to IFRS 16, effective January 1, 2019, for previous operating leases which were not capitalized, the lease liability is initially measured at the present value of the future lease payments discounted using the Company's incremental borrowing rate. Subsequently, the lease liability is adjusted for interest and lease payments, as well as the impact of lease modifications, amongst others. Since the Company elected not to apply the general requirements of IFRS 16 to short-term leases (i.e. one that does not include a purchase option and has a lease term at commencement date of 12 months or less) and leases of low value assets, the Company recognizes the lease payments associated with those leases as an expense on either a straight-line basis over the lease term or another systematic basis if that basis is representative of the pattern of the lessee's benefits, similar to the previous accounting for operating leases. The Group used the following practical expedients/elections when applying IFRS 16: - - - - - - Change in opening lease liability balances: Jan. 1, 2019 Total minimum lease payments - lease liabilities, Dec, 31, 2018 $ 78,174 Newly capitalized leases, IFRS 16 17,708 Total minimum lease payments - lease liabilities, Jan. 1, 2019 95,882 Effect of discounting (6,667 ) Present value of minimum lease payments 89,215 Less: current portion (25,421 ) $ 63,794 Reconciliation of operating leases in IAS 17 to IFRS 16: Operating lease commitments, Dec. 31, 2018 $ 63,448 Less: short term leases - expedient (3,663 ) Less: low value leases - expedient (10 ) Less: variable consideration leases 1 (46,120 ) Add: inclusion of non - lease components (election) and expected term extensions 4,053 Lease commitments - capitalizable leases, Jan. 1, 2019 17,708 Effect of discounting (2,728 ) Newly capitalized leases at January 1, 2019 $ 14,980 1 (c) IFRIC 23 Uncertainty over Income Tax Treatment The Company adopted Interpretation IFRIC 23 Uncertainty over Income Tax Treatments New standards and interpretations not yet adopted (c) Amendment to IFRS 3 - Business Combinations The amendment to IFRS 3 clarifies the definition of a business and includes an optional concentration test to determine whether an acquired set of activities and assets is a business. This amendment is in effect January 1, 2020 and will be treated prospectively. The Group will apply these amendments to future acquisition transactions.

Acquisition of remaining intere

Acquisition of remaining interest in the Rosemont project	12 Months Ended
	Dec. 31, 2019
Disclosure of detailed information about business combination [abstract]
Acquisition of remaining interest in the Rosemont project [Text Block]	5. Acquisition of remaining interest in the Rosemont project In March 2019, the Company entered into an agreement with United Copper & Moly LLC ("UCM") to purchase UCM's remaining 7.95% interest in the Rosemont project, and to terminate all of UCM's remaining earn-in and off-take rights. The acquisition was completed on April 25, 2019. Upfront cash consideration of $45,000 was paid on April 25, 2019, and the Company also committed to pay three annual installments of $10,000 per year, commencing July 1, 2022. To facilitate an orderly acquisition of UCM's interest in Rosemont, the Group, immediately prior to closing the acquisition, agreed to release UCM from repayment obligations under an intercompany Rosemont project loan in exchange for an increase in equity interest in Rosemont. As a result, the loan receivable balance of $25,978 was written off. The Group recognized the loss on the loan receivable in the income statement (refer to Note 6d). In addition, in order to recognize previously unfunded contributions to the Rosemont Project due from UCM, the Group recognized an increase to other capital reserves, a component of shareholder's equity. The acquisition provides Hudbay with 100% ownership of Rosemont, allowing greater strategic flexibility with respect to capital structure and project financing alternatives. In exchange for acquiring the percentage ownership not already owned by Hudbay, the Group paid: Cash $ 45,000 Present value of future cash installments 23,557 Total consideration $ 68,557 As part of the increase in ownership of the Rosemont Project, Hudbay acquired and assumed the following assets and liabilities, which represented the fair value of the assets and liabilities not already owned by Hudbay at the time of transaction: Current assets $ 343 Non-current assets 68,904 Liabilities (690 ) Net assets acquired $ 68,557

Revenue and expenses

Revenue and expenses	12 Months Ended
	Dec. 31, 2019
Analysis of income and expense [abstract]
Revenue and expenses [Text Block]	6. Revenue and expenses (a) Revenue The Group's revenue by significant product types: Year ended December 31, 2019 2018 Copper $ 786,332 $ 963,063 Zinc 284,897 357,396 Gold 152,394 149,043 Silver 89,685 85,808 Molybdenum 31,270 20,995 Other 4,760 4,726 1,349,338 1,581,031 Variable consideration adjustments 1 (16,295 ) (2,655 ) Pricing and volume adjustments 2 (12,123 ) (4,101 ) 1,320,920 1,574,275 Treatment and refining charges (83,481 ) (101,909 ) $ 1,237,439 $ 1,472,366 1 2 (b) Depreciation and amortization Depreciation of property, plant and equipment and amortization of intangible assets are reflected in the consolidated income statements as follows: Year ended December 31, 2019 2018 Cost of sales $ 344,555 $ 332,667 Selling and administrative expenses 2,079 477 $ 346,634 $ 333,144 (c) Share-based Expense (recoveries) expenses Share-based Expense (recoveries) expenses are reflected in the consolidated income statements as follows: Cash-settled Total share-based payment expense RSUs DSUs Year ended December 31, 2019 Cost of sales $ 400 $ - $ 400 Selling and administrative 928 1,157 2,085 Other operating 229 - 229 $ 1,557 $ 1,157 $ 2,714 Year ended December 31, 2018 Cost of sales $ 160 $ - $ 160 Selling and administrative (702 ) (1,877 ) (2,579 ) Other operating 46 - 46 $ (496 ) $ (1,877 ) $ (2,373 ) (d) Other operating expenses Year ended December 31, 2019 2018 Write down of UCM receivable (note 5) $ 25,978 $ - Regional costs 3,780 4,673 Pampacancha delivery obligation 7,499 7,218 Pension settlement loss (note 20) 96 2,163 Loss on disposal of property,plant & equipment 4,807 7,189 Closure cost adjustment 2,289 (425 ) Allocation of community costs 2,216 - Other 4,451 (1,747 ) $ 51,116 $ 19,071 During the first quarter of 2019, the Group recognized an obligation to deliver additional precious metal credits to Wheaton Precious Metals ("Wheaton") as a result of the Group's expectation that mining at the Pampacancha deposit will not begin until 2020. The obligation is to be paid in four quarterly installments, the first to be paid on March 31, 2020. A similar obligation was recorded in the first quarter of 2018, as a result of the Pampacancha deposit not being mined in 2018. The Group realized a loss on the settlement of the sale of a portion of its net pension liability. (e) Impairment During 2019, the Group recorded impairment losses of $322,249 for non-current assets relating to the Arizona cash generating units ("CGU"). Arizona Pre-tax impairment to: Property, plant & equipment (note 12) 322,249 Tax impact - (recovery) (80,143 ) After-tax impairment charge $ 242,106 On July 31, 2019, the U.S. District Court for the District of Arizona ("Court") issued a ruling in the lawsuits challenging the U.S. Forest Service's issuance of the Final Record of Decision ("FROD") for the Rosemont project in Arizona. The Court ruled to vacate and remand the FROD thereby delaying the expected start of construction of Rosemont. The Court's ruling and the subsequent impact to the Company's market capitalization gave rise to an indicator of impairment. Following an impairment test conducted as of September 30, 2019, it was determined that the recoverable amount of the Arizona CGU was lower than its carrying value, causing the Group to recognize an impairment loss related to these assets. See note 12. (f) This table presents employee benefit expense recognized in the Group's consolidated income statements, including amounts transferred from inventory upon sale of goods: Year ended December 31, 2019 2018 Current employee benefits $ 169,663 $ 176,571 Profit-sharing plan expense 1,510 9,228 Share-based payments (notes 6c, 19, 24) Cash-settled restricted share units 1,557 (496 ) Cash-settled deferred share units 1,157 (1,877 ) Employee share purchase plan 1,645 1,533 Post-employee pension benefits Defined benefit plans 10,643 12,295 Defined contribution plans 1,635 1,511 Past service costs - 383 Other post-retirement employee benefits 8,457 9,248 Termination benefits 628 1,206 $ 196,895 $ 209,602 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 Group 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 Group makes a matching contribution of 75% of the participant's contribution. See note 20 for a description of the Group's pension plans and note 21 for the Group's other employee benefit plans. (g) Finance income and expenses Year ended December 31, 2019 2018 Finance income $ (8,527 ) $ (8,450 ) Finance expenses Interest expense on long-term debt 78,265 77,783 Accretion on financial liabilities at amortized cost 1,222 1,244 Finance costs on deferred revenue (note 18) 69,772 64,921 Unwinding of discounts on provisions 4,392 4,684 Withholding taxes 8,100 9,424 Other finance expense 11,027 7,116 172,778 165,172 Interest capitalized (9,890 ) (13,172 ) 162,888 152,000 Other finance losses (gains) Net foreign exchange losses (gains) 1,388 (11,067 ) Change in fair value of financial assets and liabilities at fair value through profit or loss: Hudbay warrants - (6,748 ) Embedded derivatives 3,708 (1,514 ) Investments 4,539 3,798 9,635 (15,531 ) Net finance expense $ 163,996 $ 128,019 Until October 1, 2019, interest expense related to certain long-term debt had been capitalized to the Rosemont project. Following the Court ruling to vacate and remand the FROD for the Rosemont project during the third quarter of 2019, the Group ceased capitalization effective October 1, 2019. The capitalization of this interest expense will resume upon the reinstatement of permits and will continue from that point until commercial production is reached. Other finance expense relates primarily to fees on the Group's revolving credit facilities and capitalized leases.

Cash and cash equivalents

Cash and cash equivalents	12 Months Ended
	Dec. 31, 2019
Cash and cash equivalents [abstract]
Cash and cash equivalents [Text Block]	7. Cash and cash equivalents Dec. 31, 2019 Dec. 31, 2018 Cash on hand and demand deposits $ 396,146 $ 515,497 Short-term money market instruments with maturities of of three months or less at acquisition date - - $ 396,146 $ 515,497

Trade and other receivables

Trade and other receivables	12 Months Ended
	Dec. 31, 2019
Trade and other receivables [abstract]
Trade and other receivables [Text Block]	8. Trade and other receivables Dec. 31, 2019 Dec. 31, 2018 Current Trade receivables $ 87,332 $ 102,112 Statutory receivables 16,543 12,764 Other receivables 2,119 2,277 105,994 117,153 Non-current Taxes receivable 17,669 17,199 Receivable from joint venture partners (note 5) - 20,404 Other receivables 1,595 1,518 19,264 39,121 $ 125,258 $ 156,274

Inventories

Inventories	12 Months Ended
	Dec. 31, 2019
Disclosure Of Inventories [Abstract]
Inventories [Text Block]	9. Inventories Dec. 31, 2019 Dec. 31, 2018 Current Stockpile $ 10,396 $ 5,463 Work in progress 14,420 1,762 Finished goods 62,230 62,546 Materials and supplies 51,774 48,703 138,820 118,474 Non-current Stockpile 14,626 14,730 Materials and supplies 4,829 4,746 19,455 19,476 $ 158,275 $ 137,950 The cost of inventories recognized as an expense, including depreciation, and included in cost of sales amounted to $978,810 for the year ended December 31, 2019 (year ended December 31, 2018 - $975,354).

Other financial assets

Other financial assets	12 Months Ended
	Dec. 31, 2019
Other Financial Assets [Abstract]
Other financial assets [Text Block]	10. Other financial assets Dec. 31, 2019 Dec. 31, 2018 Current Derivative assets $ 1,712 $ 6,628 Restricted cash 337 3,738 2,049 10,366 Non-current Investments at fair value through profit or loss 11,287 15,159 $ 13,336 $ 25,525 Investments at fair value through profit or loss consist of securities in Canadian metals and mining companies, all of which are publicly traded. The change in investments at fair value through profit or loss is mostly attributed to fluctuations in market price and foreign exchange impact.

Intangibles and other assets

Intangibles and other assets	12 Months Ended
	Dec. 31, 2019
Disclosure of detailed information about intangible assets [abstract]
Intangibles and other assets [Text Block]	11. Intangibles and other assets Intangibles and other assets of $10,411 includes $5,384 of other assets (December 31, 2018 - nil) and $5,027 of intangibles (December 31, 2018 - $4,162). Intangibles mainly represent computer software costs. Dec. 31, 2019 Dec. 31, 2018 Cost Balance, beginning of year 18,557 $ 19,169 Additions 2,325 590 Disposals (96 ) - Effects of movement in exchange rates 752 (1,202 ) Balance, end of year 21,538 18,557 Accumulated amortization Balance, beginning of year 14,395 13,594 Additions 1,606 1,793 Disposals (96 ) - Effects of movement in exchange rates 606 (992 ) Balance, end of year 16,511 14,395 Intangibles, net book value $ 5,027 $ 4,162 Other assets represent the carrying value of certain future community costs. The liability remaining for these agreements is recorded in Other financial liabilities at amortized cost (note 15). Amortization of the carrying amount is recorded in the consolidated income statements within other operating expenses (note 6d).

Property, plant and equipment

Property, plant and equipment	12 Months Ended
	Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [abstract]
Property, plant and equipment [text block]	12. Property, plant and equipment Dec. 31, 2019 Exploration and evaluation assets Capital works in progress Mining properties Plant and equipment Plant and equipment- ROU assets Total Balance, Jan. 1, 2019 $ 52,206 $ 873,781 $ 1,998,439 $ 2,473,176 $ 180,151 $ 5,577,753 Additions 17,016 109,372 - 33,309 22,158 181,855 Acquisition (note 5) - 91,332 3,157 - 373 94,862 Capitalized stripping and development - - 103,108 - - 103,108 Decommissioning and restoration - 41 3,314 86,053 - 89,408 Interest capitalized - 9,890 - - - 9,890 Transfers and other movements - (30,000 ) 642 30,406 (1,048 ) - Impairment (note 6e) - (322,249 ) - - - (322,249 ) Disposals - (2,029 ) - (10,747 ) (1,533 ) (14,309 ) Effects of movements in exchange rates 681 1,528 41,080 38,452 1,793 83,534 Other - 2,208 (3,157 ) 3,103 78 2,232 Balance, Dec. 31, 2019 69,903 733,874 2,146,583 2,653,752 201,972 5,806,084 Accumulated depreciation Balance, Jan. 1, 2019 - - 780,754 872,330 89,877 1,742,961 Depreciation for the year - - 154,970 179,062 19,850 353,882 Disposals - - - (6,675 ) - (6,675 ) Effects of movement in exchange rates - - 27,806 24,970 581 53,357 Balance, Dec. 31, 2019 - - 963,530 1,069,687 110,308 2,143,525 Net book value $ 69,903 $ 733,874 $ 1,183,053 $ 1,584,065 $ 91,664 $ 3,662,559 Dec. 31, 2018 Exploration and evaluation assets Capital works in progress Mining properties Plant and equipment Plant and equipment- ROU assets 1 Total Balance, Dec. 31, 2017 $ 23,010 $ 933,531 $ 1,975,061 $ 2,536,019 $ - $ 5,467,621 Additions 9,950 88,920 - 16,689 - 115,559 Acquisitions 21,654 - - - - 21,654 Capitalized stripping and development - - 84,023 - - 84,023 Decommissioning and restoration - 15 1,711 7,272 - 8,998 Interest capitalized - 13,172 - - - 13,172 Transfers and other movements - (152,781 ) 2,132 150,649 - - Disposals (1,208 ) (4,034 ) - (9,749 ) - (14,991 ) Effects of movements in exchange rates (1,197 ) (3,873 ) (65,434 ) (62,757 ) - (133,261 ) Other (3 ) (1,169 ) 946 224 - (2 ) Balance, Dec. 31, 2018 52,206 873,781 1,998,439 2,638,347 - 5,562,773 IFRS 16 Adjustments 1 - - - (165,171 ) 180,151 14,980 Balance, Jan. 1, 2019 52,206 873,781 1,998,439 2,473,176 180,151 5,577,753 Accumulated depreciation Balance, Dec. 31, 2017 - - 683,183 820,205 - 1,503,388 Depreciation for the year - - 141,218 189,354 - 330,572 Disposals - - - (6,780 ) - (6,780 ) Effects of movement in exchange rates - - (43,469 ) (40,211 ) - (83,680 ) Other - - (178 ) (361 ) - (539 ) Balance, Dec. 31, 2018 - - 780,754 962,207 - 1,742,961 IFRS 16 Adjustments 1 - - - (89,877 ) 89,877 - Balance, Jan. 1, 2019 - - 780,754 872,330 89,877 1,742,961 Net book value, Dec.31, 2018 52,206 873,781 1,217,685 1,676,140 - 3,819,812 Net book value, Jan.1, 2019 $ 52,206 $ 873,781 $ 1,217,685 $ 1,600,846 $ 90,274 $ 3,834,792 1 Capital works in progress decreased compared to December 31, 2018 as a result of the impairment charge of $322,249 (pre-tax) related to the Arizona CGU (see note 6e), partially offset by fixed asset additions. For non-financial assets, management examines internal and external indicators of impairment or reversals of impairments on a quarterly basis. Management identified an increase in market capitalization deficiency as at September 30, 2019 which has been attributed to the Arizona CGU. Management determined that the increase in the market capitalization deficiency was related to a Court issued ruling in the lawsuits challenging the U.S. Forest Service's issuance of the FROD for the Rosemont project in Arizona. For the impairment test completed at September 30, 2019, 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 the Group's most current life of mine ("LOM") plans. 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, beginning date of project cash flows incorporating permit related project delays and future foreign exchange rates. As of September 30, 2019, for purposes of the impairment test, initial construction of the Rosemont project was estimated to commence in approximately three years (December 31, 2018 - approximately one year) and cash flows are for periods up to the date that production is expected to cease, which is in 24 years (December 31, 2018 - 22 years). 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 Arizona CGU. As at September 30, 2019, a real discount rate of 9.50% (December 31, 2018 - 7.50%) for the Arizona 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 long-term prices. As at September 30, 2019, for the Arizona CGU, the cash flow calculations utilized a long-term copper price of $3.10/lb (December 31, 2018 - $3.10/lb), molybdenum long-term prices of $11.00/lb (December 31, 2018 - $11.00/lb) and capital, operating and reclamation costs based on the most current LOM plans. As at September 30, 2019 for the Arizona CGU, a value of $74,969 (December 31, 2018 - $287,900) 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 consolidated 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 at September 30, 2019, the carrying value of the Arizona CGU exceeded the estimated recoverable amount of $615,368 by $242,106 (after-tax), leading to the impairment charge recorded (Note 6e). For the Arizona CGU, the following changes in key assumptions, in isolation of each other, would result in the following decreases in FVLCD. Decrease in FVLCD as at Change in key assumption Sep. 30, 2019 Decrease of 10% in the average LOM copper prices $ 308,148 1.0 percentage point increase in the real discount rate 135,733 One year additional delay in the start of project construction 76,921

Trade and other payables

Trade and other payables	12 Months Ended
	Dec. 31, 2019
Trade and other payables [abstract]
Trade and other payables [Text Block]	13. Trade and other payables Dec. 31, 2019 Dec. 31, 2018 Trade payables $ 68,742 $ 61,395 Accruals and payables 80,375 68,386 Accrued interest 34,603 34,662 Exploration and evaluation payables 884 185 Statutory payables 7,800 7,324 $ 192,404 $ 171,952 Accruals and payables include operational and capital costs and employee benefit amounts owing.

Other liabilities

Other liabilities	12 Months Ended
	Dec. 31, 2019
Miscellaneous current liabilities [abstract]
Other liabilities [Text Block]	14. Other liabilities Dec. 31, 2019 Dec. 31, 2018 Current Provisions (note 19) $ 33,575 $ 14,276 Pension liability (note 20) 12,015 11,854 Other employee benefits (note 21) 2,806 2,564 Unearned revenue 1,015 1,857 $ 49,411 $ 30,551

Other financial liabilities

Other financial liabilities	12 Months Ended
	Dec. 31, 2019
Disclosure of financial liabilities [abstract]
Other financial liabilities [Text Block]	15. Other financial liabilities Dec. 31, 2019 Dec. 31, 2018 Current Derivative liabilities $ 10,295 $ 2,634 Other financial liabilities at amortized cost 8,707 2,590 Embedded derivatives (note 26c) 9,074 7,201 28,076 12,425 Non-current Deferred Rosemont acquisition consideration (note 5) 24,491 - Other financial liabilities at amortized cost 15,293 18,771 39,784 18,771 $ 67,860 $ 31,196 The derivative liabilities include derivative and hedging transactions. Derivative liabilities are carried at their fair value with changes in fair value recorded to the consolidated income statements. The fair value adjustments for hedging type derivatives are recorded in revenue. Fair value adjustments for embedded derivatives are recorded in other finance (gain) loss. Other financial liabilities 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.

Lease Liability

Lease Liability	12 Months Ended
	Dec. 31, 2019
Lease liabilities [abstract]
Lease Liability [Text Block]	16. Lease Liability Dec. 31, 2019 Dec. 31, 2018 Total minimum lease payments - lease liabilities $ 88,096 $ 78,174 Effect of discounting (6,149 ) (3,939 ) Present value of minimum lease payments 81,947 74,235 Less: current portion (32,781 ) (20,472 ) $ 49,166 $ 53,763 Minimum payments under leases: Less than 12 months $ 27,557 $ 18,448 13 - 36 months 48,503 40,615 37 - 60 months 7,798 19,111 More than 60 months 4,238 - $ 88,096 $ 78,174 The Group has entered into leases for its Peru, Manitoba and Arizona business units which expire between 2020 and 2043. The interest rates on leases which were capitalized have implicit interest rates between 1.95% to 5.13%, per annum. The range of interest rates utilized for discounting varies depending mostly on the Hudbay Group entity acting as lessee and duration of the lease. For certain leases, the Group has the option to purchase the equipment and vehicles leased at the end of the terms of the leases. The Group'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 a 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 the Group by entering into these leases. The following outlines expenses recognized within the Company's consolidated income statement for the periods ended December 31, 2019, relating to leases for which a recognition exemption was applied. Year ended Dec. 31, 2019 Short-term leases $ 45,745 Low value leases 92 Variable leases 56,152 Total $ 101,989 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 business unit during its development phase and certain amounts may be reported in inventories given the timing of sales. Variable consideration leases include equipment used for heavy civil works at Constancia.

Long-term debt

Long-term debt	12 Months Ended
	Dec. 31, 2019
Disclosure of detailed information about borrowings [abstract]
Long-term debt [Text Block]	17. Long-term debt Long-term debt is comprised of the following: Dec. 31, 2019 Dec. 31, 2018 Senior unsecured notes (a) $ 991,558 $ 989,306 Less: Unamortized transaction costs - revolving credit facilities (b) (6,303 ) (8,276 ) $ 985,255 $ 981,030 (a) Senior unsecured notes Balance, January 1, 2018 $ 987,903 Change in fair value of embedded derivative (prepayment option) 316 Accretion of transaction costs and premiums 1,087 Balance, December 31, 2018 $ 989,306 Change in fair value of embedded derivative (prepayment option) 1,079 Accretion of transaction costs and premiums 1,173 Balance, December 31, 2019 $ 991,558 The $1,000,000 aggregate principal amount of senior notes are comprised of two series: (i) a series of 7.25% senior notes due 2023 in an aggregate principal amount of $400,000 and (ii) a series of 7.625% senior notes due 2025 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 subsidiaries, which include the Company's subsidiaries that own an interest in the Rosemont project and 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) Unamortized transaction costs - revolving credit facilities Balance, January 1, 2018 $ 8,328 Accretion of transaction costs (1,946 ) Transaction costs 1,894 Balance, December 31, 2018 $ 8,276 Accretion of transaction costs (2,342 ) Transaction costs 369 Balance, December 31, 2019 $ 6,303 As at December 31, 2019, the Peru business unit had $40,000 in surety bonds issued to support its reclamation obligations. The Arizona business unit had $8,591 in surety bonds issued to support future reclamation and closure obligations. No cash collateral is required to be posted. The Peru business unit had $43,509 in letters of credit issued under the Peru facility to support its reclamation obligations and the Manitoba business unit had $85,927 in letters of credit issued under the Canada facility to support its reclamation and pension obligations. Given that these letters of credit are issued under the senior credit facilities, no cash collateral is required to be posted. Lastly, the Peru business unit had $45,000 in letters of credit issued with various Peruvian financial institutions.

Deferred revenue

Deferred revenue	12 Months Ended
	Dec. 31, 2019
Disclosure of deferred revenue [abstract]
Deferred revenue [Text Block]	18. Deferred revenue On August 8, 2012 and November 4, 2013, the Group entered into precious metals stream transactions with Wheaton whereby the Group has received aggregate deposit payments of $885,000 against delivery of (i) 100% of payable gold and silver from the 777 mine until the end of 2016, and delivery of 50% of payable gold and 100% of payable silver for the remainder of the 777 mine life; and (ii) 100% of payable silver and 50% of payable gold from the Constancia mine. In addition to the deposit payments, as gold and silver is delivered to Wheaton, the Group receives cash payments equal to the lesser of (i) the market price and (ii) $400 per ounce (for gold) and $5.90 per ounce (for silver), subject to 1% annual escalation after three years, from the inception of the agreement. The Group recorded the deposits received as deferred revenue and recognizes amounts in revenue as gold and silver are delivered to Wheaton. The Group determines the amortization of deferred revenue to the consolidated income statements on a per unit basis using the estimated total number of gold and silver ounces expected to be delivered to Wheaton over the life of the 777 and Constancia life-of-mine plans. The Group estimates the current portion of deferred revenue based on deliveries anticipated over the next twelve months. The Group has determined that precious metals stream contracts are subject to variable consideration and contain a significant financing component. As such, the Company recognizes a financing charge at each reporting period and will gross up the deferred revenue balance to recognize the significant financing element that is part of these contracts. The Group's streaming arrangements are secured against the mining properties and other business unit assets associated with the applicable stream. The Group expects that the remaining performance obligations for the 777 and Constancia streams will be settled by the expiry of their respective stream agreements, which is no earlier than 2036. The following table summarizes changes in deferred revenue: Balance, January 1, 2018 $ 601,930 Amortization of deferred revenue Liability drawdown (96,038 ) Variable consideration adjustment 2,655 Finance costs 64,921 Effects of changes in foreign exchange (7,390 ) Balance, December 31, 2018 $ 566,078 Amortization of deferred revenue Liability drawdown (92,398 ) Variable consideration adjustment 16,295 Finance costs (note 6g) Current year additions 63,725 Variable consideration adjustment 6,047 Effects of changes in foreign exchange 4,009 Balance, December 31, 2019 $ 563,756 Consideration from the Company's stream agreement is considered variable. Gold and silver revenue can be subject to cumulative adjustments when the number of ounces to be delivered under the contract changes. During the year ended December 31, 2018, and first quarter of 2019, the Company recognized an adjustment to gold and silver revenue and finance costs due to a net increase in the Company's reserve and resource estimates. Deferred revenue is reflected in the consolidated balance sheets as follows: Dec. 31, 2019 Dec. 31, 2018 Current $ 86,933 $ 86,256 Non-current 476,823 479,822 $ 563,756 $ 566,078

Provisions

Provisions	12 Months Ended
	Dec. 31, 2019
Disclosure of other provisions [abstract]
Provisions [Text Block]	19. Provisions Decommis-sioning, restoration and similar liabilities Deferred share units (note 24a) Restricted share units 1 (note 24a) Other Total Balance, January 1, 2019 $ 202,024 $ 4,288 $ 12,201 $ 411 $ 218,924 Net additional provisions made 68,881 1,479 2,885 2,882 76,127 Amounts used (4,136 ) (1,668 ) (9,380 ) (341 ) (15,525 ) Unwinding of discount (note 6g) 4,392 - - - 4,392 Effect of change in discount rate 23,635 - - - 23,635 Effect of foreign exchange 7,320 99 225 4 7,648 Effect of change in share price - (322 ) (454 ) - (776 ) Balance, December 31, 2019 $ 302,116 $ 3,876 $ 5,477 $ 2,956 $ 314,425 1 Provisions are reflected in the consolidated balance sheets as follows: December 31, 2019 Decommis-sioning, restoration and similar liabilities Deferred share units (note 24a) Restricted share units 1 (note 24a) Other Total Current (note 14) $ 23,621 $ 3,876 $ 4,468 $ 1,610 $ 33,575 Non-current 278,495 - 1,009 1,346 280,850 $ 302,116 $ 3,876 $ 5,477 $ 2,956 $ 314,425 Decommis-sioning, restoration and similar liabilities Deferred share units (note 24a) Restricted share units 1 Other Total Balance, January 1, 2018 $ 200,041 $ 6,623 $ 19,409 $ 1,435 $ 227,508 Net additional provisions made 9,031 973 7,493 - 17,497 Amounts used (188 ) - (6,435 ) (770 ) (7,393 ) Unwinding of discount (note 6g) 4,684 - - - 4,684 Effect of change in discount rate (462 ) - - - (462 ) Effect of foreign exchange (11,082 ) (458 ) (973 ) (74 ) (12,587 ) Effect of change in share price - (2,850 ) (7,293 ) (180 ) (10,323 ) Balance, December 31, 2018 $ 202,024 $ 4,288 $ 12,201 $ 411 $ 218,924 1 December 31, 2018 Decommis-sioning, restoration and similar liabilities Deferred share units (note 24a) Restricted share units1 (note 24a) Other Total Current (note 14) $ 1,234 $ 4,288 $ 8,412 $ 342 $ 14,276 Non-current 200,790 - 3,789 69 204,648 $ 202,024 $ 4,288 $ 12,201 $ 411 $ 218,924 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 The Group'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. During 2019, additional provisions were recognized as a result of higher estimates for closure activities of tailings facilities at the Manitoba operations to ensure compliance with higher industry-wide standards for tailings management safety and, to a lesser extent, increased mine activity footprints and the resulting higher disturbance at the Constancia operation. During the year ended December 31, 2018 additional provisions were recognized as a result of increased mine activity footprints and the resulting higher disturbance at the Constancia operation. The Group's decommissioning and restoration liabilities relate mainly to its Manitoba operations. Management anticipates that the assets in Flin Flon will be placed on care and maintenance once mining activities are completed at 777 mine in order to maintain optionality for restart should a new mine be found in the Flin Flon area. The majority of closure activities will occur once all mining activities in Manitoba are completed, which is currently anticipated in 2028. These provisions also reflect estimated post-closure cash flows that extend to 2100 for ongoing monitoring and water treatment requirements. Management anticipates most decommissioning and restoration activities for the Constancia operation will occur from 2035 to 2070, which include ongoing monitoring and water treatment requirements. These estimates have been discounted to their present value at rates ranging from 1.59% to 2.39% per annum (2018 - 1.80% to 3.02%), using pre-tax risk-free interest rates that reflect the estimated maturity of each specific liability.

Pension obligations

Pension obligations	12 Months Ended
	Dec. 31, 2019
Pension Obligations [Abstract]
Pension obligations [Text Block]	20. Pension obligations The Group maintains non-contributory and contributory defined benefit pension plans for certain of its employees. The Group uses a December 31 measurement date for all of its plans. For the Group's significant plans, the most recent actuarial valuations filed for funding purposes were performed during 2019 using data as at December 31, 2018. For these plans, the next actuarial valuation required for funding purposes will be performed during 2020 using data as at December 31, 2019. During the year ended December 31, 2018, 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 $120,018 from plan assets. Movements in the present value of the defined benefit obligation in the current and previous years were as follows: Year ended Dec. 31, 2019 Dec. 31, 2018 Opening defined benefit obligation: $ 211,512 $ 383,054 Current service costs 9,880 11,032 Past service cost related to the new collective bargaining agreement - 383 Interest cost 7,156 12,009 Benefits paid from plan (16,745 ) (29,499 ) Benefits paid from employer (934 ) (1,998 ) Participant contributions 64 98 Effects of movements in exchange rates 10,814 (32,015 ) Remeasurement actuarial (gains)/losses: Arising from changes in demographic assumptions - - Arising from changes in financial assumptions 30,455 (11,585 ) Arising from experience adjustments (2,258 ) (2,112 ) Settlement payments from plan assets (6,307 ) (120,018 ) Loss on settlement (note 6d) 96 2,163 Closing defined benefit obligation $ 243,733 $ 211,512 The defined benefit obligation closing balance, by member group, is as follows: Dec. 31, 2019 Dec. 31, 2018 Active members $ 231,959 $ 200,591 Deferred members 1,555 723 Retired members 10,219 10,198 Closing defined benefit obligation $ 243,733 $ 211,512 Movements in the fair value of the pension plan assets in the current and previous years were as follows: Year ended Dec. 31, 2019 Dec. 31, 2018 Opening fair value of plan assets: $ 175,795 $ 341,432 Interest income 6,170 11,033 Remeasurements losses: Return on plan assets (excluding amounts included in net interest expense) 21,460 (15,296 ) Contributions from the employer 11,952 17,020 Employer direct benefit payments 934 1,998 Contributions from plan participants 64 98 Benefit payment from employer (934 ) (1,998 ) Administrative expenses paid from plan assets (82 ) (83 ) Benefits paid (16,745 ) (29,499 ) Settlement payments from plan assets (6,307 ) (120,018 ) Effects of changes in foreign exchange rates 9,812 (28,892 ) Closing fair value of plan assets $ 202,119 $ 175,795 The amount included in the consolidated balance sheets arising from the entity's obligation in respect of its defined benefit plans is as follows: Dec. 31, 2019 Dec. 31, 2018 Present value of funded defined benefit obligation $ 224,364 $ 195,283 Fair value of plan assets (202,119 ) (175,795 ) Present value of unfunded defined benefit obligation 19,369 16,229 Net liability arising from defined benefit obligation $ 41,614 $ 35,717 Reflected in the consolidated balance sheets as follows: Dec. 31, 2019 Dec. 31, 2018 Pension obligation - current (note 14) $ 12,015 $ 11,854 Pension obligation - non-current 29,599 23,863 Total pension obligation $ 41,614 $ 35,717 Pension expense is as follows: Dec. 31, 2019 Dec. 31, 2018 Service costs: Current service cost $ 9,880 $ 11,032 Past service cost - 383 Loss on settlement (note 6d) 96 2,163 Total service cost 9,976 13,578 Net interest expense 986 976 Administration cost 82 83 Defined benefit pension expense $ 11,044 $ 14,637 Defined contribution pension expense $ 1,639 $ 1,469 Remeasurement on the net defined benefit liability: Dec. 31, 2019 Dec. 31, 2018 (Return)/loss on plan assets (excluding amounts included in net interest expense) $ (21,460 ) $ 15,296 Actuarial gains arising from changes in demographic assumptions - - Actuarial losses/(gains) arising from changes in financial assumptions 29,609 (11,585 ) Actuarial gains arising from experience adjustments (2,258 ) (2,112 ) Defined benefit loss/(gain) related to remeasurement $ 5,891 $ 1,599 Total pension cost $ 18,574 $ 17,705 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 the Group to actuarial risks such as: investment risk, interest rate risk, longevity risk and salary risk. Investment risk The present value of the liabilities for the defined benefit plans is calculated using a discount rate determined by reference to high quality corporate bond yields; if the return on plan assets is below this rate, it will create a plan deficit. The Group's primary quantitative investment objectives are maximization of the long term real rate of return, subject to an acceptable degree of investment risk and preservation of principal. Risk tolerance is established through consideration of several factors including past performance, current market condition and the funded status of the plan. Interest risk A decrease in the bond interest rate will increase the pension plan liabilities; however, this will be partially offset by an increase in the return on the plan's debt investments Longevity risk The present value of the defined benefit plans liabilities is calculated by reference to the best estimate of the mortality of plan participants both during and after their employment. An increase in the life expectancy of the plan participants will increase the pension plans liabilities. Salary risk The present value of the defined benefit plans liabilities for some of the pension plans is calculated by reference to the future salaries of plan participants. As such, an increase in the salary of the plan participants will increase the plans' liabilities. The principal assumptions used for the purposes of the actuarial valuations were as follows: 2019 2018 Defined benefit cost: Discount rate - benefit obligations 3.73 % 3.45 % Discount rate - service cost 3.75 % 3.50 % Expected rate of salary increase 1 2.75 % 2.75 % Average longevity at retirement age for current pensioners (years) 2 Males 21.1 21.0 Females 23.9 23.7 Defined benefit obligation: Discount rate 3.08 % 3.73 % Expected rate of salary increase 1 2.75 % 2.75 % Average longevity at retirement age for current pensioners (years) 2 Males 21.2 21.1 Females 23.9 23.9 Average longevity at retirement age for current employees (future pensioners) (years) 2 Males 23.0 23.0 Females 25.6 25.6 1 2 The Group reviews the assumptions used to measure pension costs (including the discount rate) on an annual basis. Economic and market conditions at the measurement date affect these assumptions from year to year. In determining the discount rate, the Group considers the duration of the pension plan liabilities. Significant actuarial assumptions for the determination of the defined benefit obligation are discount rate, expected salary increase and mortality. The sensitivity analysis below has been determined based on reasonably possible changes of the respective assumptions occurring at the end of the reporting periods, while holding other assumptions constant: - - - The sensitivity analysis presented above may not be representative of the actual change in the defined benefit obligation as it is unlikely that the change in assumptions would occur in isolation of one another as some of the assumptions may be correlated. Furthermore, in presenting the above sensitivity analysis, the present value of the defined benefit obligation has been calculated using the projected unit credit method at the end of the reporting period, which is the same as that applied in calculating the defined benefit obligation liability recognised in the consolidated balance sheets. The Group's main pension plans are registered federally with the Office of the Superintendent of Financial Institution and with the Canada Revenue Agency. The registered pension plans are governed in accordance with the Pension Benefits Standards Act and the Income Tax Act. The sponsor contributes the amount needed to maintain adequate funding as dictated by the prevailing regulations. Expected employer contribution to the pension plans for the fiscal year ending December 31, 2020 is $12,070. The average duration of the pension obligation at December 31, 2019 is 19.3 years (2018 - 17.3 years). This number can be broken down as follows: - - - Asset-Liability-Matching studies are performed periodically to analyse the investment policies in terms of risk and-return profiles. The actual return on plan assets in 2019 was 15.1% (2018: negative 2.6%). The pension plans do not invest directly in either securities or property/real estate of the Group. With the exception of fixed income investments, the plan assets are actively managed by investment managers, with the goal of attaining returns that potentially outperform passively managed investments. Within appropriate limits, the actual composition of the invested funds may vary from the prescribed investment mix. The following is a summary of the fair value classification levels for investment: December 31, 2019 Level 1 Level 2 Level 3 Total Investments: Money market instruments $ 1,588 $ - $ - $ 1,588 Pooled equity funds 76,680 - - 76,680 Pooled fixed income funds - 103,646 - 103,646 Alternative investment funds - 19,438 - 19,438 Balanced funds - 767 - 767 $ 78,268 $ 123,851 $ - $ 202,119 December 31, 2018 Level 1 Level 2 Level 3 Total Investments: Money market instruments $ 3,072 $ - $ - $ 3,072 Pooled equity funds 53,329 - - 53,329 Pooled fixed income funds - 91,854 - 91,854 Alternative investment funds - 26,871 - 26,871 Balanced funds - 669 - 669 $ 56,401 $ 119,394 $ - $ 175,795

Other employee benefits

Other employee benefits	12 Months Ended
	Dec. 31, 2019
Other Employee Benefits [Abstract]
Other employee benefits [Text Block]	21. Other employee benefits The Group sponsors both other long-term employee benefit plans and non-pension post-employment benefits plans and uses a December 31 measurement date. These obligations relate mainly to commitments for post-retirement health benefits. Information about the Group's post-employment and other long-term employee benefits is as follows: Movements in the present value of the defined benefit obligation in the current and previous years were: Year ended Dec. 31, 2019 Dec. 31, 2018 Opening defined benefit obligation $ 93,528 $ 107,829 Current service cost 1 3,060 3,455 Past service cost - 255 Interest cost 3,600 3,683 Effects of movements in exchange rates 4,864 (8,587 ) Remeasurement actuarial (gains)/losses: Arising from changes in demographic assumptions - (9,996 ) Arising from changes in financial assumptions 14,094 2,809 Arising from experience adjustments 87 (3,472 ) Benefits paid (2,537 ) (2,448 ) Closing defined benefit obligation $ 116,696 $ 93,528 1 The defined benefit obligation closing balance, by group member, is as follows: Dec. 31, 2019 Dec. 31, 2018 Active members $ 60,801 $ 47,249 Inactive members 55,895 46,279 Closing defined benefit obligation $ 116,696 $ 93,528 Movements in the fair value of defined benefit amounts in the current and previous years were as follows: Dec. 31, 2019 Dec. 31, 2018 Employer contributions $ 2,537 $ 2,448 Benefits paid (2,537 ) (2,448 ) Closing fair value of assets $ - $ - The non-pension employee benefit plan obligations are unfunded. Reconciliation of assets and liabilities recognized in the consolidated balance sheets: Dec. 31, 2019 Dec. 31, 2018 Unfunded benefit obligation $ 116,696 $ 93,528 Vacation accrual and other - non-current 2,888 2,664 Net liability $ 119,584 $ 96,192 Reflected in the consolidated balance sheets as follows: Dec. 31, 2019 Dec. 31, 2018 Other employee benefits liability - current (note 14) $ 2,806 $ 2,564 Other employee benefits liability - non-current 116,778 93,628 Net liability $ 119,584 $ 96,192 Other employee future benefit expense includes the following Dec. 31, 2019 Dec. 31, 2018 Current service cost 1 $ 3,060 $ 3,710 Net interest cost 3,600 3,683 Components recognized in consolidated income statements $ 6,660 $ 7,393 1 Dec. 31, 2019 Dec. 31, 2018 Remeasurement on the net defined benefit liability: Actuarial (gains)/losses arising from changes in demographic assumptions $ - $ (9,996 ) Actuarial (gains)/losses arising from changes in financial assumptions 14,094 2,809 Actuarial gains arising from changes experience adjustments 87 (3,472 ) Components recognized in statements of comprehensive income $ 14,181 $ (10,659 ) Total other employee future benefit cost $ 20,841 $ (3,266 ) Other employee benefit 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. Dec. 31, 2019 Dec. 31, 2018 Defined benefit cost: Discount rate 3.88 % 3.64 % Initial weighted average health care trend rate 5.74 % 5.97 % Ultimate weighted average health care trend rate 4.00 % 4.00 % Average longevity at retirement age for current pensioners (years) 1 Males 21.1 21.0 Females 23.9 23.7 Dec. 31, 2019 Dec. 31, 2018 Defined benefit obligation: Discount rate 3.17 % 3.88 % Initial weighted average health care trend rate 5.68 % 5.74 % Ultimate weighted average health care trend rate 4.00 % 4.00 % Average longevity at retirement age for current pensioners (years) 1 Males 21.2 21.1 Females 23.9 23.9 Average longevity at retirement age for current employees (future pensioners) (years) 1 Males 23.1 23.0 Females 25.6 25.6 1 The Group reviews the assumptions used to measure other employee benefit costs (including the discount rate) on an annual basis. The other employee benefit costs typically expose the Group to actuarial risks such as: interest rate risk, health care cost inflation risk and longevity risk. Interest risk A decrease in the bond interest rate will increase the plan liabilities. Health care cost inflation risk The majority of the plan's benefit obligations are linked to health care cost inflation and higher inflation will lead to higher liabilities. Longevity risk The majority of the plans' benefit liability is calculated by reference to the best estimate of the mortality of plan participants both during and after their employment. An increase in the life expectancy of the plan participants will increase the plans liabilities. This is particularly significant for benefits subject to health care cost inflation where increases in inflation result in higher sensitivity to changes in life expectancy. The sensitivity analyses below have been determined based on reasonably possible changes of the respective assumptions occurring at the end of the reporting period, while holding other assumptions constant: - - - The average duration of the non-pension post employment obligation at December 31, 2019 is 19.6 years (2018: 18.6 years). This number can be broken down as follows: - -

Income and mining taxes

Income and mining taxes	12 Months Ended
	Dec. 31, 2019
Major components of tax expense (income) [abstract]
Income and mining taxes [Text Block]	22. Income and mining taxes (a) Tax expense: The tax expense (recoveries) is applicable as follows: Year ended December 31, 2019 2018 Current: Income taxes Canada $ 11,196 $ 5,251 Peru 13,723 19,103 Mining taxes Canada 341 9,085 Peru 4,379 11,030 Adjustments in respect of prior years 6,273 707 35,912 45,176 Deferred: Income taxes (recoveries) - origination, revaluation and/or and reversal of temporary differences Canada (59,082 ) 25,811 Peru (6,280 ) 10,780 United States (68,106 ) 3,170 Mining taxes (recoveries) - origination, revaluation and/or reversal of temporary difference Canada (10,266 ) 414 Peru (1,948 ) (621 ) Adjustments in respect of prior years 817 691 (144,865 ) 40,245 $ (108,953 ) $ 85,421 Adjustments in respect of prior years refers to amounts changing due to the filing of tax returns and assessments from government authorities. (b) Deferred tax assets and liabilities as represented on the consolidated balance sheets: Dec. 31, 2019 Dec. 31, 2018 Deferred income tax asset Canada $ 69,950 $ 15,513 Deferred income tax liability Peru (191,611 ) (196,452 ) United States (41,607 ) (110,861 ) Deferred mining tax asset (liability) Canada 5,095 (5,119 ) Peru (9,709 ) (11,658 ) (237,832 ) (324,090 ) Net deferred tax liability balance, end of year $ (167,882 ) $ (308,577 ) (c) Changes in deferred tax assets and liabilities: Year ended Dec. 31, 2019 Year ended Dec. 31, 2018 Net deferred tax liability balance, beginning of year $ (308,577 ) $ (277,466 ) Deferred tax recovery (expense) 144,865 (40,245 ) OCI transactions 1,878 520 Foreign currency translation on the deferred tax liability (6,048 ) 8,614 Net deferred tax liability balance, end of year $ (167,882 ) $ (308,577 ) (d) Reconciliation to statutory tax rate: As a result of its mining operations, the Group is subject to both income and mining taxes. Generally, most expenditures incurred are deductible in computing income tax, whereas mining tax legislation, although based on a measure of profitability from carrying on mining operations, is more restrictive in respect of the deductions permitted in computing income subject to mining tax. These restrictions include costs unrelated to mining operations as well as deductions for financing expenses, such as interest and royalties. In addition, income unrelated to carrying on mining operations is not subject to mining tax. A reconciliation between tax expense and the product of accounting profit multiplied by the Group's statutory income tax rate for the years ended December 31, 2019 and 2018 is as follows: Year ended December 31, 2019 2018 Statutory tax rate 27.00 % 27.00 % Tax expense at statutory rate $ (122,246 ) $ 46,126 Effect of: Deductions related to mining taxes (1,493 ) (5,976 ) Adjusted income taxes (123,739 ) 40,150 Mining tax (recovery) expense (6,674 ) 19,214 (130,413 ) 59,364 Permanent differences related to: Capital items 3,270 (2,903 ) Other income taxes permanent differences 1,747 (454 ) Impact of remeasurement on decommissioning liability (16,265 ) 3,898 Temporary income tax differences not recognized 6,219 4,449 Non-deductible impairment on UCM receivable 7,041 - Withholding tax on dividend 6,826 - Impact related to differences in tax rates in foreign operations 20,338 9,594 Impact of changes in statutory tax rates (259 ) 45 Foreign exchange on non-monetary items (6,633 ) 11,408 Impact related to tax assessment and tax return amendments (824 ) 20 Tax (recovery) expense $ (108,953 ) $ 85,421 (e) Income tax effect of temporary differences - recognized: The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities at December 31, 2019 and 2018 are as follows: Balance sheet Income Statement Dec.31, 2019 Dec. 31, 2018 Dec.31, 2019 Dec. 31, 2018 Deferred income tax (liability) asset/expense (recovery) Property, plant and equipment $ (96,841 ) $ (83,407 ) $ 13,434 $ (18,646 ) Pension obligation 11,332 7,817 (1,115 ) 2,739 Other employee benefits 16,837 13,488 (3,349 ) 3,254 Decommissioning and restoration obligation 41,208 7,817 (33,391 ) (2,055 ) Non-capital losses 90,446 72,470 (17,976 ) 19,025 Share issuance and debt costs 6,540 10,896 4,361 4,807 Deferred revenue (112 ) (7,622 ) (7,510 ) 5,096 Other 540 (5,946 ) (12,839 ) 4,640 Deferred income tax asset/expense (recovery) 69,950 15,513 (58,385 ) 18,860 Deferred income tax liability (assets)/(recovery) expense Property, plant and equipment 259,145 339,037 (79,892 ) 25,456 Other employee benefits (80 ) 240 (320 ) 48 Asset retirement obligations (833 ) (918 ) 85 (129 ) Non-capital losses (28,643 ) (27,374 ) (1,269 ) 165 Other 3,629 (3,672 ) 7,302 (3,439 ) Deferred income tax liability/(recovery) expense 233,218 307,313 (74,094 ) 22,101 Deferred income tax liability/(recovery) expense $ (163,268 ) $ (291,800 ) $ (132,479 ) $ 40,961 The above reconciling items are disclosed at the tax rates that apply in the jurisdiction where they have arisen. The Other category in the above table includes the effect of foreign exchange fluctuations. (f) Income tax temporary differences - not recognized: The Group has not recognized deferred tax asset in respect of the following deductible income tax temporary differences: Dec. 31, 2019 Dec. 31, 2018 Property, plant and equipment $ 33,269 $ - Capital losses 159,545 200,455 Other employee benefits 68,866 77,166 Asset retirement obligations 146,679 175,091 Non-capital losses 122,979 116,542 Temporary differences not recognized $ 531,338 $ 569,254 The deductible temporary differences excluding non-capital losses do not expire under current tax legislation. The Canadian non-capital losses were incurred between 2006 and 2019 and expire between 2026 and 2039. The Group incurred United Stated net operating losses between 2004 and 2019 which have a twenty year carry forward period. Peruvian net operating losses were incurred from 2014 to 2016 which have a four year carry forward period. (g) The tax effects of temporary differences that give rise to significant portions of the deferred mining tax assets and liabilities at December 31, 2019 and December 31, 2018 are as follows: Dec. 31, 2019 Dec. 31, 2018 Canada Property, plant and equipment $ 5,095 $ (5,119 ) Dec. 31, 2019 Dec. 31, 2018 Peru Property, plant and equipment $ (9,710 ) $ (11,658 ) For the year ended December 31, 2019, the Group had unrecognized deferred mining tax assets of approximately $5,361 (December 31, 2018 - $8,469). (h) Unrecognized taxable temporary differences associated with investments: There are no taxable temporary differences associated with investments in subsidiaries, associated and joint ventures, for which a deferred tax liability has not been recognized. (i) Tax receivable/payable: The timing of payments results in significant variances in period-to-period comparison of the tax receivable and tax payable balances. (j) Other disclosure: The tax rules and regulations applicable to mining companies are highly complex and subject to interpretation. The Group may be subject in the future to a review of its historic income and other tax filings and, in connection with such reviews disputes can arise with the taxing authorities over the interpretation or application of certain tax rules and regulations in respect of the Group's business. These reviews may alter the timing or amount of taxable income or deductions. The amount ultimately reassessed upon resolution of issues raised may differ from the amount accrued.

Share capital

Share capital	12 Months Ended
	Dec. 31, 2019
Disclosure of classes of share capital [abstract]
Share capital [Text Block]	23. Share capital (a) Preference shares: Authorized: Unlimited preference shares without par value (b) Common shares: Authorized: Unlimited common shares without par value Issued and fully paid: Year ended Dec. 31, 2019 Year ended Dec. 31, 2018 Common shares Amount Common shares Amount Balance, beginning of year 261,272,151 $ 1,777,340 261,271,188 $ 1,777,409 Share issue costs, net of tax - - - (80 ) Warrants exercised - - 963 11 Balance, end of year 261,272,151 $ 1,777,340 261,272,151 $ 1,777,340 During the year ended December 31, 2019, the Company declared two semi-annual dividends of C$0.01 per share each. The Company paid $1,955 and $1,972 in dividends on March 29, 2019 and September 27, 2019 to shareholders of record as of March 8, 2019 and September 6, 2019. During the year ended December 31, 2018 , the Company paid $2,026 and $2,019 on March 29, 2018 and September 28, 2018 to shareholders of record as of March 9, 2018 and September 7, 2018, respectively. The Company declared a semi-annual dividend of C$0.01 per share on February 20, 2020. The dividend will be paid on March 27, 2020 to shareholders of record as of March 10, 2020 and is expected to total C$2,613.

Share-based payment

Share-based payment	12 Months Ended
	Dec. 31, 2019
Disclosure of terms and conditions of share-based payment arrangement [abstract]
Share-based payment [Text Block]	24. Share-based payment (a) Cash-settled share-based payments: The Group has two cash-settled share-based payment plans, as described below. Deferred Share Units (DSU) At December 31, 2019, the carrying amount and the intrinsic value of the outstanding liability related to the DSU plan was $3,876 (December 31, 2018 - $4,288) (note 19). The following table outlines information related to DSUs granted, expenses recognized and payments made during the year. Year ended Dec. 31, 2019 Dec. 31, 2018 Granted during the year: Number of units 337,999 158,886 Weighted average price (C$/unit) $ 5.89 $ 7.91 Expenses (gain) recognized during the year 1 $ 1,157 $ (1,877) Payments made during the year (note 19) $ 1,668 $ - 1 Restricted Share Units (RSU) RSUs granted under the LTEP Plan may be settled in the form of Hudbay 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. RSUs may also be granted under Hudbay's Share Unit Plan, however; the RSUs granted under the Share Unit Plan may only be settled in cash. Hudbay has historically settled all RSUs in cash. The Company has determined that the appropriate accounting treatment is to classify the RSUs as cash settled transactions. At December 31, 2019, the carrying amount of the outstanding liability related to the RSU plan was $5,477 (December 31, 2018 - $12,201) (note 19). The following table outlines information related to RSUs granted, expenses recognized and payments made in the year. Year ended Dec. 31, 2019 Dec. 31, 2018 Number of units, beginning of year 3,666,867 3,405,713 Number of units granted during the year 1,080,741 1,031,701 Credits for dividends 7,554 9,724 Number of units forfeited during the year (573,914 ) (21,190) Number of units vested (1,957,249 ) (759,081) Number of units, end of year 1 2,223,999 3,666,867 Weighted average price - granted (C$/unit) $ 8.98 $ 10.33 Expenses (gain) recognized during the year 2 $ 1,557 $ (496) Payments made during the year (note 19) $ 9,380 $ 6,435 1 2 (b) Equity-settled share-based payment - stock options: The Group's stock option plan was approved in June 2005 and amended in May 2008 (the "Plan"). Under the amended Plan, the Group may grant to employees, officers, directors or consultants of the Group or its affiliates options to purchase up to a maximum of 13 million common shares of the Group. As of December 31, 2018, all options had either been exercised, or expired. No options were granted under the Plan during the years ended December 31, 2019 and December 31, 2018. The Group estimates expected life of options and expected volatility based on historical data, which may differ from actual outcomes. Year ended Year ended Dec. 31, 2019 Dec. 31, 2018 Number of shares subject to option Weighted-average exercise price C$ Number of shares subject to option Weighted average exercise price C$ Balance, beginning of year - $ - 523,352 $ 15.86 Forfeited - $ - - $ - Expired - $ - (523,352) $ 15.86 Balance, end of year - $ - - $ -

Capital management

Capital management	12 Months Ended
	Dec. 31, 2019
Disclosure of objectives, policies and processes for managing capital [abstract]
Capital management [Text Block]	25. Capital management The Group's definition of capital includes total equity and long-term debt. The Group's long-term debt balance as at December 31, 2019 was $985,255 (December 31, 2018 - $981,030). The Group's objectives when managing capital are to maintain a strong capital base in order to: - - Hudbay monitors its capital and capital structure on an ongoing basis to ensure they are sufficient to achieve the Group's short-term and long-term strategic objectives in a capital intensive industry. The Group faces several risks, including volatile metals prices, access to capital, and risk of delays and cost escalation associated with major capital projects. The Group continually assesses the adequacy of its capital structure to ensure its objectives are met. Hudbay monitors its cash and cash equivalents, which were $396,146 as at December 31, 2019 (2018 - $515,497), together with availability under its committed credit facilities. The Group invests its cash and cash equivalents primarily in Canadian bankers' acceptances, deposits at major Canadian and Peruvian banks, or treasury bills issued by the federal or provincial governments. In addition to the requirement to maintain sufficient cash balances to fund continuing operations, the Group must maintain sufficient cash to fund the interest expense on the long-term debt outstanding (note 17). As part of the Group's capital management activities, the Group monitors interest coverage ratios and leverage ratios.

Financial instruments

Financial instruments	12 Months Ended
	Dec. 31, 2019
Financial Instruments [Abstract]
Financial instruments [Text Block]	26. Financial instruments (a) Fair value and carrying value of financial instruments: The following presents the fair value ("FV") and carrying value ("CV") of the Group's financial instruments and non-financial derivatives: Dec. 31, 2019 Dec. 31, 2018 FV CV FV CV Financial assets at amortized cost Cash and cash equivalents 1 $ 396,146 $ 396,146 $ 515,497 $ 515,497 Restricted cash 1 337 337 3,738 3,738 Fair value through profit or loss Trade and other receivables 1, 2 91,046 91,046 126,311 126,311 Non-hedge derivative assets 3 1,712 1,712 6,628 6,628 Prepayment option - embedded derivatives 7 2,585 2,585 3,664 3,664 Investments at FVTPL 4 11,287 11,287 15,159 15,159 Total financial assets 503,113 503,113 670,997 670,997 Financial liabilities at amortized cost Trade and other payables 1, 2 184,604 184,604 164,628 164,628 Deferred Rosemont acquisition consideration 8 24,491 24,491 - - Other financial liabilities 5 21,338 24,000 17,425 21,361 Senior unsecured notes 6 1,050,126 994,143 988,294 992,970 Fair value through profit or loss - - - - Embedded derivatives 3 9,074 9,074 7,201 7,201 Non-hedge derivative liabilities 3 10,295 10,295 2,634 2,634 Total financial liabilities 1,299,928 1,246,607 1,180,182 1,188,794 Net financial liability $ (796,815 ) $ (743,494 ) $ (509,185 ) $ (517,797 ) 1 2 3 4 5 6 7 8 Fair value hierarchy The table below provides an analysis by valuation method of financial instruments that are measured at fair value subsequent to recognition. 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: - - - December 31, 2019 Level 1 Level 2 Level 3 Total Financial assets measured at fair value Financial assets at FVTPL: Non-hedge derivatives $ - $ 1,712 $ - $ 1,712 Investments at FVTPL 11,287 - - 11,287 Prepayment option embedded derivative - 2,585 - 2,585 $ 11,287 $ 4,297 $ - $ 15,584 Financial liabilities measured at fair value Financial liabilities at FVTPL: Embedded derivatives $ - $ 9,074 $ - $ 9,074 Non-hedge derivatives - 10,295 - 10,295 $ - $ 19,369 $ - $ 19,369 December 31, 2018 Level 1 Level 2 Level 3 Total Financial assets measured at fair value Financial assets at FVTPL: Non-hedge derivatives $ - $ 6,628 $ - $ 6,628 Investments at FVTPL 15,159 - - 15,159 Prepayment option embedded derivative - 3,664 - 3,664 $ 15,159 $ 10,292 $ - $ 25,451 Financial liabilities measured at fair value Financial liabilities at FVTPL: Embedded derivatives $ - $ 7,201 $ - $ 7,201 Non-hedge derivatives - 2,634 - 2,634 $ - $ 9,835 $ - $ 9,835 The Group's policy is to recognize transfers into and transfers out of fair value hierarchy levels as of the date of the event or change in circumstances that caused the transfer. During the year ended December 31, 2019 and 2018 the Group did not make any transfers. (b) Derivatives and hedging: Copper fixed for floating swaps Hudbay enters into copper fixed for floating swaps in order to manage the risk associated with provisional pricing terms in copper concentrate sales agreements. As at December 31, 2019, the Group had 30,000 tonnes of net copper swaps outstanding at an effective average price of $2.67/lb and settling across January to April 2020. The aggregate fair value of the transactions at December 31, 2019 was a liability position of $8,362 (December 31, 2018 was an asset position of $4,171). Non-hedge derivative zinc contracts Hudbay enters into fixed price sales contracts with zinc customers and, to ensure that the Group continues to receive a floating or unhedged realized zinc price, Hudbay enters into forward zinc purchase contracts that effectively offset the fixed price sales contracts. At December 31, 2019, the Group held contracts for forward zinc purchased of (c) Embedded derivatives Changes in fair value of provisionally priced receivables The Group records changes in fair value of provisionally priced receivables related to provisional pricing in concentrate purchase, concentrate sale and certain other sale contracts. Under the terms of these contracts, prices are subject to final adjustment at the end of a future period after title transfers based on quoted market prices during the quotation period specified in the contract. The period between provisional pricing and final pricing is typically up to three months. Changes in fair value of provisionally priced receivables are presented in trade and other receivables when they relate to sales contracts and in trade and other payables when they relate to purchase contracts. At each reporting date, provisionally priced metals are marked-to-market based on the forward market price for the quotation period stipulated in the contract, with changes in fair value recognized in revenue for sales contracts and in cost of sales for purchase concentrate contracts. Cash flows related to changes in fair value of provisionally priced receivables are classified in operating activities. As at December 31, 2019 and 2018, the Group's net position consisted of contracts awaiting final pricing which are as indicated below: Sales awaiting final pricing Average YTD price ($/unit) Metal in concentrate Unit Dec. 31, 2019 Dec. 31, 2018 Dec. 31, 2019 Dec. 31, 2018 Copper tonnes 33,102 30,519 2.80 2.69 Zinc tonnes - 199 - 1.13 Gold oz 16,152 15,528 1,522 1,279 Silver oz 124,371 96,646 17.86 15.45 The aggregate changes in fair value of provisionally priced receivables within the copper and zinc concentrate sales contracts at December 31, 2019, was an asset position of $10,165 Prepayment option embedded derivative The senior unsecured notes (note 17) contain prepayment options, which represent embedded derivatives that require bifurcation from the host contract. The prepayment options are measured at fair value, with changes in the fair value being recognized as unrealized gains or losses in finance income and expense (note 6g). The fair value of the embedded derivative at December 31, 2019 was an asset of $2,585 (December 31, 2018 - an asset of $3,664). Pampacancha delivery obligation-embedded derivative The Group has recognized an obligation to deliver additional precious metal credits to Wheaton as a result of the Pampacancha deposit not being mined until 2020. The fair value of the embedded derivative at December 31, 2019 was a liability of $9,074 (December 31, 2018 - $7,201). (d) Financial risk management The Group's financial risk management activities are governed by Board-approved policies addressing risk identification, hedging authorization procedures and limits and reporting. Hudbay's policy objective, when hedging activities are undertaken, is to reduce the volatility of future profit and cash flow within the strategic and economic goals of the Group. The Group from time to time employs derivative financial instruments, including forward and option contracts, to manage risk originating from exposures to commodity price risk, foreign exchange risk and interest rate risk. Significant derivative transactions are approved by the Board of Directors, and hedge accounting is applied when certain criteria have been met. The Group does not use derivative financial instruments for trading or speculation purposes. The following is a discussion of the Group's risk exposures. (i) Market risk Market risk is the risk that changes in market prices, including foreign exchange rates, commodity prices, share prices, and interest rates will cause fluctuations in the fair value or future cash flows of a financial instrument. Foreign currency risk The Group's primary exposure to foreign currency risk arises from: - - The Manitoba segment's primary financial instrument foreign currency exposure is on US denominated cash and cash equivalents, trade and other receivables and other financial liabilities. The Peru segment's primary financial instrument foreign currency exposure is on Peruvian soles cash and cash equivalents, trade and other payables and other financial liabilities. The Group's exposure to foreign currency risk was as follows based on notional financial instruments amounts stated in US equivalent dollars: Dec. 31, 2019 Dec. 31, 2018 CAD 1 USD 2 PEN 3 CAD 1 USD 2 PEN 3 Cash and cash equivalent $ 8,394 $ 21,217 $ 7,617 $ 11,498 $ 29,740 $ 13,934 Trade and other receivables 374 56,998 25,413 711 42,056 1,272 Other financial assets 11,287 - - 15,159 - - Trade and other payables (5,719 ) (435 ) (22,618 ) (5,341 ) (3,133 ) (19,513 ) Other financial liabilities - - (24,000 ) - - (21,361 ) $ 14,336 $ 77,780 $ (13,588 ) $ 22,027 $ 68,663 $ (25,668 ) 1 2 3 The following sensitivity analysis for foreign currency risk relates solely to financial instruments and non financial derivatives that were outstanding as at the year end date; each sensitivity calculation assumes all other variables are held constant. This analysis is based on values as at December 31, 2019 and does not reflect the overall effect that changes in market variables would have on the Group's results of operations. December 31, 2019 Change of: Would have changed 2019 after-tax profit by: USD/CAD exchange rate 1 + 10% $ 3.4 million USD/CAD exchange rate 1 - 10% (4.1 ) million USD/PEN exchange rate 2 + 10% 0.8 million USD/PEN exchange rate 2 - 10% (1.0 ) million December 31, 2018 Change of: Would have changed 2018 after-tax profit by: USD/CAD exchange rate 1 + 10% $ 5.0 million USD/CAD exchange rate 1 - 10% (6.0 ) million USD/PEN exchange rate 2 + 10% 1.5 million USD/PEN exchange rate 2 - 10% (1.8 ) million 1 2 Commodity price risk Hudbay is exposed to market risk from prices for the commodities the Group produces and sells, such as copper, zinc, gold and silver. From time to time, the Group maintains price protection programs and conducts commodity price risk management through the use of derivative contracts. The following sensitivity analysis for commodity price risk relates solely to financial instruments and non financial derivatives that were outstanding as at the year end date; each sensitivity calculation assumes all other variables are held constant. This analysis is based on values as at December 31, 2019 and does not reflect the overall effect that changes in market variables would have on the Group's results of operations. December 31, 2019 Change of: Would have changed 2019 after-tax profit by: Copper prices ($/lb) 3 + $ 0.30 $ (2.0 ) million Copper prices ($/lb) 3 - $ 0.30 2.0 million Zinc prices ($/lb) 4 + $ 0.10 1.0 million Zinc prices ($/lb) 4 - $ 0.10 (1.0 ) million December 31, 2018 Change of: Would have changed 2018 after-tax profit by: Copper prices ($/lb) 3 + $ 0.30 $ (3.1) million Copper prices ($/lb) 3 - 3.1 million Zinc prices ($/lb) 4 + $ 0.10 0.5 million Zinc prices ($/lb) 4 - (0.5) million 3 4 Share price risk Hudbay is exposed to market risk from share prices for the Group's investments in listed Canadian metals and mining companies. These investments are made to foster strategic relationships, in connection with joint venture agreements and for investment purposes. Management monitors the value of these investments for the purposes of determining whether to add or reduce the Group's positions. The following sensitivity analysis for share price risk relates solely to financial instruments that were outstanding as at the year-end date; each sensitivity calculation assumes all other variables are held constant. This analysis is based on values as at December 31, 2019 and does not reflect the overall effect that changes in market variables would have on the Group's finance expenses. December 31, 2019 Change of: Would have changed 2019 after-tax profit by: Share prices + 25% $ 2.8 million Share prices - 25% (2.8 ) million December 31, 2018 Change of: Would have changed 2018 after-tax profit by: Share prices + 25% $ 3.8 million Share prices - 25% (3.8) million Interest rate risk The Group is exposed to the following interest rate risks: - - - The most material of these risks is the embedded derivative associated with its Notes. This analysis is based on values at December 31, 2019 and does not reflect the overall effect that changes in market variables would have on the group's finance expenses. December 31, 2019 Change of: Would have changed 2019 after-tax profit by: Interest rates + 2.00% $ 2.3 million Interest rates - 2.00% (2.6 ) million December 31, 2018 Change of: Would have changed 2018 after-tax profit by: Interest rates + 2.00% $ (3.3) million Interest rates - 3.2 million Refer to note 7 for information on the Group's cash and cash equivalents. (ii) Credit risk Credit risk is the risk of financial loss to the Group if a customer or counterparty to a financial instrument fails to meet its obligations. The Group's maximum exposure to credit risk at the reporting date is represented by the carrying amount, net of any impairment losses recognized, of financial assets and non financial derivative assets recorded on the consolidated balance sheets. Refer to note 26a. A large portion of the Group's cash and cash equivalents are represented by deposits with major Schedule 1 Canadian banks. Deposits and other investments with Schedule 1 Canadian banks represented 92% of total cash and cash equivalents as at December 31, 2019 (2018 - 74%). The Group's investment policy requires it to comply with a list of approved investment, concentration and maturity limits, as well as credit quality. Credit concentrations in the Group's short term investments are monitored on an ongoing basis. Transactions involving derivatives are with counterparties the Group believes to be credit worthy. Management has a credit policy in place that requires the Group to obtain credit insurance from an investment grade credit insurance provider to mitigate exposure to credit risk in its receivables. At December 31, 2019, approximately 96% of the Group's trade receivables were insured or payable by letters of credit (2018 - 95% were insured or payable by letters of credit). Insured receivables have a credit insurance deductible of 10%. The deductible and any additional exposure to credit risk is monitored and approved on an ongoing basis. Two customers accounted for approximately 63% of total trade receivables as at December 31, 2019 (2018 - four customers accounted for approximately 78%). Credit risk for these customers is assessed as medium to low risk. As at December 31, 2019, none of the Group's trade receivables was aged more than 30 days (2018 - nil). (iii) Liquidity risk Liquidity risk is the risk that the Group will not be able to meet its obligations associated with financial liabilities. Hudbay's objective is to maintain sufficient liquid resources to meet operational and investing requirements. The following summarizes the contractual undiscounted cash flows of the Group's non-derivative and derivative financial liabilities, including any interest payments, by remaining contractual maturity and financial assets used to manage liquidity risk. The table includes all instruments held at the reporting date for which payments had been contractually agreed at the reporting date. The undiscounted amounts shown are gross amounts, unless the liabilities will be settled net. Amounts in foreign currency are translated at the closing rate at the reporting date. When a counterparty has a choice of when an amount is paid, the liability is allocated to the earliest possible time period. Dec. 31, 2019 Carrying amount Contractual cash flows 12 months or less 13 - 36 months 37 - 60 months More than 60 months Assets used to manage liquidity risk Cash and cash equivalents $ 396,146 $ 396,146 $ 396,146 $ - $ - $ - Restricted cash 337 337 337 - - - Trade and other receivables 91,046 91,046 89,451 - - 1,595 Non-hedge derivative assets 1,712 1,712 1,712 - - - $ 489,241 $ 489,241 $ 487,646 $ - $ - $ 1,595 Non-derivative financial liabilities Trade and other payables, including embedded derivatives $ (184,604 ) $ (184,604 ) $ (184,604 ) $ - $ - $ - Other financial liabilities (24,000 ) (33,723 ) (6,672 ) (4,811 ) (4,734 ) (17,506 ) Deferred Rosemont acquisition consideration (24,491 ) (30,000 ) - (10,000 ) (20,000 ) - Long-term debt, including embedded derivatives (991,558 ) (1,350,540 ) (72,165 ) (149,500 ) (1,128,875 ) - $ (1,224,653 ) $ (1,598,867 ) $ (263,441 ) $ (164,311 ) $ (1,153,609 ) $ (17,506 ) Derivative financial liabilities Embedded derivative (9,074 ) (9,074 ) (9,074 ) - - - Non hedge derivative contracts (10,295 ) (10,295 ) (10,295 ) - - - (19,369 ) (19,369 ) (19,369 ) - - - Dec. 31, 2018 Carrying amount Contractual cash flows 12 months or less 13 - 36 months 37 - 60 months More than 60 months Assets used to manage liquidity risk Cash and cash equivalents $ 515,497 $ 515,497 $ 515,497 $ - $ - $ - Trade and other receivables 126,311 136,913 112,258 11,440 13,215 - Non-hedge derivative assets 6,628 6,628 6,628 - - - $ 648,436 $ 659,038 $ 634,383 $ 11,440 $ 13,215 $ - Non-derivative financial liabilities Trade and other payables, including embedded derivatives $ (164,628 ) $ (164,628 ) $ (164,628 ) $ - $ - $ - Other financial liabilities (21,361 ) (31,854 ) (3,719 ) (4,757 ) (3,068 ) (20,310 ) Long-term debt, including embedded derivatives (981,030 ) (1,439,821 ) (79,263 ) (156,933 ) (535,000 ) (668,625 ) $ (1,167,019 ) $ (1,636,303 ) $ (247,610 ) $ (161,690 ) $ (538,068 ) $ (688,935 ) Derivative financial liabilities Non-hedge derivative contracts (2,634 ) (2,634 ) (2,634 ) - - - $ (2,634 ) $ (2,634 ) $ (2,634 ) $ - $ - $ -

Commitments and contingencies

Commitments and contingencies	12 Months Ended
	Dec. 31, 2019
Disclosure Of Commitments And Contingent Liabilities Abstract
Commitments and contingencies [Text Block]	27. Commitments and contingencies (a) Non-capitalized lease commitments The Group has entered into various non-capitalized lease commitments for facilities and equipment. The leases expire in periods ranging from one to three years. There are no restrictions placed on the Group by entering into these leases. Future minimum lease payments under such cancelable leases recognized in operating expenses at December 31 are: 2019 Within one year $ 57,860 After one year but not more than five years 26,395 More than five years - $ 84,255 (b) Capital commitments As at December 31, 2019, the Group had outstanding capital commitments in Canada of approximately $3,681, of which $1,897 can be terminated, approximately $34,617 in Peru, all of which can be terminated, and approximately $180,440 in Arizona, primarily related to the Rosemont project, of which approximately $89,370 can be terminated by the Group. (c) Contingent liabilities Contingent liabilities The Group is involved in various claims, litigation and other matters arising in the ordinary course and conduct of business. While it is not possible to determine the ultimate outcome of such actions at this time, and inherent uncertainties exist in predicting such outcomes, it is the Group's belief that the ultimate resolution of such actions is not reasonably likely to have a material adverse effect on its consolidated financial position or results of operations. The assessment of contingencies inherently involves the exercise of significant judgment and estimates of the outcome of future events. As a result of the assessment, no significant contingent liabilities have been recorded in these consolidated financial statements. As part of the streaming agreement with Wheaton for the 777 mine, the Group must repay, with precious metals credits, the legal deposit provided by Wheaton by August 1, 2052, the expiry date of the agreement. If the legal deposit is not fully repaid with precious metals credits related to 777 production by the expiry date, a cash payment for the remaining amount will be due at the expiry date of the agreement. As a result of changes in the remaining 777 mine reserves and lower precious metals prices, there is a possibility that an amount of Wheaton's legal deposit may not be repaid by means of 777 mine's precious metals credits over its expected remaining mine life. Contingent assets There were no significant contingent assets to disclose at December 31, 2019 or December 31, 2018.

Related parties

Related parties	12 Months Ended
	Dec. 31, 2019
Disclosure of transactions between related parties [abstract]
Related parties [Text Block]	28. Related parties (a) Group companies The financial statements include the financial statements of the Company and the following significant subsidiaries: Beneficial ownership of ultimate controlling party (Hudbay Minerals Inc.) Name Jurisdiction Business Entity's Parent 2019 2018 HudBay Marketing & Sales Inc Canada Marketing and sales HMI 100% 100% HudBay Peru Inc British Columbia Holding company HMI 100% 100% HudBay Peru S.A.C. Peru Exploration/development Peru Inc. 100% 100% HudBay (BVI) Inc. British Virgin Islands Precious metals sales Peru Inc. 100% 100% Hudbay Arizona Inc. British Columbia Holding company HMI 100% 100% Rosemont Copper Company Arizona Exploration/development HudBay Arizona (US) Holding Corporation 100% 100% Transactions between the Company and its subsidiaries, which are related parties of the Company, have been eliminated on consolidation and are not disclosed in this note. ( b) Compensation of key management personnel The Group's key management includes members of the Board of Directors, the Group's Chief Executive Officer, the Group's senior vice presidents and vice presidents. Total compensation to key management personnel was as follows: 2019 2018 Short-term employee benefits 1 $ 8,319 $ 8,652 Post-employment benefits 762 762 Long-term share-based awards 6,966 5,970 $ 16,047 $ 15,384 1

Supplementary cash flow informa

Supplementary cash flow information	12 Months Ended
	Dec. 31, 2018
Supplementary Cash Flow Information [Abstract]
Supplementary cash flow information [text block]	29. Supplementary cash flow information (a) Change in non-cash working capital: Year ended December 31, 2019 2018 Change in: Trade and other receivables $ 3,252 $ 16,198 Other financial assets/liabilities 12,540 (17,290 ) Inventories (11,759 ) (32 ) Prepaid expenses (3,484 ) (38 ) Trade and other payables 5,613 (19,608 ) Provisions and other liabilities (2,591 ) (1,030 ) $ 3,572 $ (21,800 ) The Group has retroactively changed its presentation of changes in taxes payable/receivable in the statements of cash flows to report all changes in taxes payable/receivable within the operating cash flow before changes in non-cash working capital. There is no net impact to cash flows from operating activities. All comparative periods have been revised. (b) Non cash transactions: During the year ended December 31, 2019, the Group entered into the following non-cash investing and financing activities which are not reflected in the consolidated statements of cash flows: - - -

Segmented information

Segmented information	12 Months Ended
	Dec. 31, 2019
Disclosure of operating segments [abstract]
Segmented information [Text Block]	30. Segmented information The Group is an integrated metals producer. When making decisions on expansions, opening or closing mines, as well as day to day operations, management evaluates the profitability of the overall operation of the Group. The Group's main mining operations are located in Manitoba and Saskatchewan (Canada) and Cusco (Peru) and are included in the Manitoba segment and Peru segment, respectively. The Manitoba and Peru segments generate the Group's revenue. The Manitoba segment sells copper concentrate (containing copper, gold and silver), zinc metal and other products. The Peru segment consists of the Group's Constancia operation and sells copper concentrate and molybdenum concentrate. The Group's Arizona segment consists of the Group's Rosemont project in Arizona. Corporate and other activities include the Group's exploration activities in Chile, and Nevada. The exploration entities are not individually significant, as they do not meet the minimum quantitative thresholds. Corporate activities are not considered a segment and are included as a reconciliation to total consolidated results. Accounting policies for each reported segment are the same as the Company. Results from operating activities represents the profit earned by each segment without allocation of corporate costs. This is the measure reported to the chief operating decision-maker, the Group's President and Chief Executive Officer, for the purposes of resource allocation and the assessment of segment performance. Total assets and liabilities do not reflect intercompany balances, which have been eliminated on consolidation. Year ended December 31, 2019 Manitoba Peru Arizona Corporate and other activities Total Revenue from external customers $ 537,421 $ 700,018 $ - $ - $ 1,237,439 Cost of sales Mine operating costs 385,159 356,183 - - 741,342 Depreciation and amortization 135,429 209,126 - - 344,555 Gross profit 16,833 134,709 - - 151,542 Selling and administrative expenses - - - 36,170 36,170 Exploration and evaluation expenses 18,476 5,804 - 6,494 30,774 Other operating expenses 8,201 14,022 28,149 744 51,116 Impairment loss - - 322,249 - 322,249 Results from operating activities $ (9,844 ) $ 114,883 $ (350,398 ) $ (43,408 ) $ (288,767 ) Finance income (8,527 ) Finance expenses 162,888 Other finance losses 9,635 Loss before tax (452,763 ) Tax recovery (108,953 ) Loss for the year $ (343,810 ) Year ended December 31, 2018 Manitoba Peru Arizona Corporate and other activities Total Revenue from external customers $ 667,322 $ 805,044 $ - $ - $ 1,472,366 Cost of sales Mine operating costs 412,760 353,199 - - 765,959 Depreciation and amortization 121,515 211,152 - - 332,667 Gross profit 133,047 240,693 - - 373,740 Selling and administrative expenses - - - 27,243 27,243 Exploration and evaluation expenses 12,302 5,640 - 10,628 28,570 Other operating expenses 5,433 11,739 539 1,360 19,071 Results from operating activities $ 115,312 $ 223,314 $ (539 ) $ (39,231 ) $ 298,856 Finance income (8,450 ) Finance expenses 152,000 Other finance gain (15,531 ) Profit before tax 170,837 Tax expense 85,421 Profit for the year $ 85,416 December 31, 2019 Manitoba Peru Arizona Corporate and other activities Total Total assets $ 774,800 $ 2,556,895 $ 700,799 $ 423,467 $ 4,455,961 Total liabilities 551,171 926,642 78,988 1,051,037 2,607,838 Property, plant and equipment 1 684,679 2,253,404 691,538 32,938 3,662,559 1 December 31, 2019 Manitoba Peru Arizona Corporate and other activities Total Additions to property, plant and equipment $ 143,418 $ 101,717 $ 38,923 $ 905 $ 284,963 December 31, 2018 Manitoba Peru Arizona Corporate and other activities Total Total assets $ 621,253 $ 2,751,525 $ 896,693 $ 416,164 $ 4,685,635 Total liabilities 424,576 921,773 115,470 1,044,960 2,506,779 Property, plant and equipment 572,947 2,353,229 868,921 24,715 3,819,812 December 31, 2018 Manitoba Peru Arizona Corporate and other activities Total Additions to property, plant and equipment $ 123,896 $ 55,818 $ 19,846 $ 22 $ 199,582 Geographical Segments The following tables represent revenue information regarding the Group's geographical segments for the years ended December 31: 2019 2018 Revenue by customer location 1 Canada $ 418,636 $ 553,411 United States 209,382 211,681 Switzerland 162,167 253,165 Germany 10,731 52,530 China 158,795 140,440 Peru 110,411 65,721 Philippines 71,506 84,687 United Kingdom 62,462 68,346 Other 33,349 42,385 $ 1,237,439 $ 1,472,366 1 During the year ended December 31, 2019, six customers accounted for approximately 24%, 9%, 9%, 8%, 5% and 5%, respectively, of total revenue during the year. Revenue from these customers has been presented in the Manitoba and Peru operating segments. During the year ended December 31, 2018, six customers accounted for approximately 26%, 9%, 8%, 7%, 5% and 5%, respectively, of total revenue during the year. Revenue from these customers has been presented in the Manitoba and Peru operating segments.

Summary of Significant Accounti

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2019
Significant Accounting Policies [Abstract]
Basis of consolidation [Policy Text Block]	(a) Basis of consolidation: Intercompany balances and transactions are eliminated upon consolidation. When a Group entity transacts with an associate or jointly controlled entity of the Group, unrealized profits and losses are eliminated to the extent of the Group's interest in the relevant associate or joint venture. The accounting policies of Group entities are changed when necessary to align them with the policies adopted by the Company. Subsidiaries A subsidiary is an entity controlled by the Group. The financial statements of subsidiaries are included in the consolidated financial statements from the date that control commences until the date that control ceases. Business combinations and goodwill When the Group makes 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. The Group 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 interests 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 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 Group's previously held interests in the acquired entity are remeasured to fair value at the acquisition date, which is the date the Group 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 interests 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 the Group'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. An impairment loss in respect of goodwill is not reversed. Fair value for mineral interests 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 the Group's continued use and cannot take into account future development. The weighted average cost of capital of the Group 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, the Group 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.
Translation of foreign currencies [Policy Text Block]	(b) Translation of foreign currencies: Management determines the functional currency of each Group 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 Group 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 noon 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 Group entities that have functional currencies other than the US dollar are translated to US dollars at the reporting date using the noon 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 interests. 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.
Revenue recognition [Policy Text Block]	c) Revenue from the sale of goods is measured at the fair value of the consideration received or receivable, net of treatment and refining charges and pre-production revenue. Revenue from the sale of by-products is included within revenue. Sales revenue is recognized when control of the goods sold has been transferred to the buyer. Control is deemed to have passed to the customer when significant risk and reward of the product has passed to the buyer, Hudbay has a present right to payment and physical possession of the product has been transferred to the buyer. 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. Incoterms used by Hudbay Revenue recognized when goods: Cost, Insurance and Freight (CIF) Are loaded on board the vessel Free on Board (FOB) Are loaded on board the vessel Delivered at place (DAP) Arrive at the named place of destination Delivered at terminal (DAT) Arrive at the named place of destination Free Carrier (FCA) Arrive at the named place of delivery Sales of 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, 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 may revisit its revenue recognition policy. The Group 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 stand alone selling basis to any separate performance obligations and are recognized over the period of time the goods sold are shipped, on a gross basis. The Group recognizes deferred revenue in the event it receives payments from customers before a sale meets criteria for revenue recognition. There is a significant financing component associated with the Group's precious metal streaming arrangements 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.
Cost of sales [Policy Text Block]	(d) 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 payments and other indirect expenses related to producing operations.
Cash and cash equivalents [Policy Text Block]	(e) 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 are classified as non-current assets and presented in restricted cash on the consolidated balance sheets. Changes in restricted cash balances are classified as investing activities on the consolidated statements of cash flows.
Inventories [Policy Text Block]	(f) Inventories consist of stockpiles, in-process inventory (concentrates and metals), metal products and supplies. Concentrates, 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 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. 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: 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. A regular review is undertaken to determine the extent of any provision for obsolescence.
Intangible assets [Policy Text Block]	(g) Computer software is measured at cost less accumulated amortization and accumulated impairment losses. Costs include all directly attributable costs necessary to create, produce and prepare the asset to be capable of operating it in the manner intended by management. Amortization methods, useful lives, and residual values if any, are reviewed at each year end and adjusted prospectively, if required. When an intangible asset is disposed of, or when no further economic benefits are expected, the asset is derecognized, and any resulting gain or loss is recorded in the consolidated income statements. Currently, the Group's intangible assets relate primarily to enterprise resource planning ("ERP") information systems, which are amortized over their estimated useful lives.
Exploration and evaluation expenditures [Policy Text Block]	(h) Exploration and evaluation expenditures: Exploration and evaluation activity begins when the Group 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 interests in mineral rights, licenses and properties and the costs of the Group's exploration activities, such as researching and analyzing existing exploration data, gathering data through geological studies, exploratory drilling, trenching, sampling, and certain feasibility studies. The Group expenses the cost of its exploration and evaluation activities and capitalizes the cost of acquiring interests 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. The Group 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. The Group monitors exploration and evaluation assets for factors that may indicate their carrying amounts are not recoverable. If such indicators are identified, the Group tests the exploration and evaluation assets or their CGUs, as applicable, for impairment. The Group also tests 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 Group determines that probable future economic benefits will be generated as a result of the expenditures. The Group'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.
Property, plant and equipment [Policy Text Block]	(i) The Group 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 for which the Group 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 revenue earned in the process of preparing an asset to be capable of operating in the manner intended by management is included in the cost of the constructed asset. Any other incidental revenue earned prior to commencement of commercial production is recognized in the consolidated income statements. Carrying amounts of property, plant and equipment, including assets under finance leases, 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 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 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. 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 consists of buildings and fixtures, surface and underground fixed and mobile equipment and assets under finance 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) The Group has applied IFRS 16 using the modified retrospective approach. The impact of the changes in disclosed in Note 4. At inception of a contract, the Group 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 group assesses the following criteria in the determination of whether a contract conveys the right to control the use of an identified asset: • • • • • The Group has applied this approach to contracts entered into or changed on or after January 1, 2019. The Group's approach to other contracts is explained in Note 4. The Group recognizes a right-of-use ("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, the Group's incremental borrowing rate. Generally, the Group uses its incremental borrowing rate as the discount rate. Lease payments included in the measurement of the lease liability comprise fixed payments including insubstance 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 the Group reasonably expects to incur due to purchase options, extension options and termination options reasonably expected to be exercised. The lease liability is measured at amortised 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. The Group 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 Group has elected not to recognise 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. The Group recognizes the lease payments associated with these leases as an expense on a straight-line basis over the lease term. The Group does not enter into transactions where the Group acts as a lessor. The incremental borrowing rate used for new ROU leases as at January 1, 2019 and going forward which are required to incorporate assessments of asset specific attributes such as quality and location is a key management judgement. (v) • • • • • • • The Group reviews its depreciation methods, remaining useful lives and residual values at least annually and accounts for changes in estimates prospectively. (vi) 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. The Group considers a range of factors when determining the level of activity that represents commercial production for a particular project, including a pre-determined 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) The Group 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 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 the Group 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) 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. 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.
Impairment of non-financial assets [Policy Text Block]	(j) financial assets: At the end of each reporting period, the Group 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 Group estimates the recoverable amount of the asset in order to determine the extent of the impairment loss, if any. The Group 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. The Group's CGUs consist of Manitoba, Peru, Arizona and greenfield exploration and evaluation assets. The Group 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, if recorded, is tested for impairment annually and whenever there is an indication that the asset may be impaired. 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: - - The Group 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 Group'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. The Group 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 Group 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 has 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.
Assets held for sale [Policy Text Block]	(k) Assets held for sale: The Group classifies non-current assets, or disposal groups consisting of assets and liabilities, as held for sale when it expects to recover their carrying amounts primarily through sale rather than through continuing use. To meet criteria to be held for sale, the sale must be highly probable, and the assets or disposal groups must be available for immediate sale in their present condition. The Group must be committed to a plan to sell the assets or disposal group, and the sale should be expected to qualify for recognition as a completed sale within one year from the date of classification. The Group measures assets or disposal groups at the lower of their carrying amount and fair value less costs of disposal. Impairment losses on initial classification as held for sale and subsequent gains and losses on remeasurement are recognized in the consolidated income statements; however, gains are not recognized in excess of any cumulative impairment loss. Any impairment loss on a disposal group first is allocated to goodwill, and then to remaining assets and liabilities on pro rata basis, except that no loss is allocated to inventories, financial assets, deferred tax assets, employee benefit assets or investment property. Upon classifying assets or disposal groups as held for sale, the Group presents the assets separately as a single amount and the liabilities separately as a single amount on the consolidated balance sheets. When an asset no longer meets the criteria for classification as an asset held for sale, the Group records the asset at the lower of its recoverable amount and the carrying amount before the asset was classified as held for sale.
Pension and other employee benefits [Policy Text Block]	(l) Pension and other employee benefits: The Group 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 Group 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). The Group 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 Group 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, the Group 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 Group 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: - - - The first two components of defined benefit costs shown above are recognized in the consolidated income statements. Past service cost is 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. 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 recognised in OCI in the period in which they occur. Remeasurement recognised 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, remeasurments 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. The Group also has defined contribution plans providing pension benefits for certain of its salaried employees and certain of its US employees utilizing 401K plans. The Group 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 the Group 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 Group 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.
Provisions [Policy Text Block]	(m) Provisions: Provisions are recognized when the Group 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 Group'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 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 operating expenses. The Group assesses the reasonableness of its estimates and assumptions each year and when conditions change and the estimates are revised accordingly. Judgement is required to determine the scope of future decommissioning and restoration activities, as well as such 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 Group 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 Assets. 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 the Group'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 and regulations are continually evolving in all regions in which the Group operates. The Group is not able to determine the impact, if any, of environmental laws and regulations 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. The Group 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 the Group, 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.
Financial Instruments [Policy Text Block]	(n) 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. The Group uses trade date accounting for regular way purchases or sales of financial assets. The Group 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, the Group 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) Financial assets at fair value through profit or loss Provisionally priced copper sales receivables, warrants, investments in securities of junior mining companies and the Group's joint venture receivables are classified as financial assets at fair value through profit or loss and are measured at fair value. The unrealized gains or losses related to changes in fair value are reported in other finance income/expense in the consolidated income statements. Amortized cost Cash and cash equivalents 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 recognised 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. (i) Derivatives are initially recognized at fair value when the Group 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. Contracts to buy or sell non-financial items that meet the definition of a derivative but were entered into and are held in accordance with the Group's expected purchase, sale or usage requirements are not recognized as derivatives. Such contracts are recorded as non-derivative purchases and sales. (ii) The Group considers whether a contract contains an embedded derivative when it becomes a party to the contract. Derivatives embedded in other financial instruments or other 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. (iii) 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 Group 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: - - - An analysis of fair values of financial instruments is provided in note 26. (iv) The Group 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 and measured as at the present value of all cash shortfalls including the impact of forward looking information. The Company 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. The loss allowance is presented as a deduction to trade receivables in the balance sheets. (v) The Group derecognizes financial assets when the contractual rights to the cash flows from the assets expire, or when the Group 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 transferred financial assets that is created or retained by the Group is recognized as a separate asset or liability. The Group 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.
Taxation [Policy Text Block]	(o) 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 Group 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 the Group operates could limit the ability of the Group 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: - - 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: - - To the extent that it is probable that taxable profit will be available to offset the deductible temporary differences, the Group 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.
Share capital and reserves [Policy Text Block]	(p) 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 payments and includes amounts for stock 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.
Share-based payments [Policy Text Block]	(q) Share-based payments: Hudbay offers a Deferred Share Unit ("DSU") plan for non-employee members of the Board of Directors and a Restricted Share Unit ("RSU") plan for employees. Hudbay also had options outstanding under a stock option plan. These plans are included in provisions on the consolidated balance sheets and further described in note 24. Changes in the fair value of the liabilities are recorded in the consolidated income statements. Cash-settled transactions, consisting of DSUs and RSUs, 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. The Group values the liabilities based on the change in the Company's share price. Additional DSUs and RSUs 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 are generally issued under Hudbay's Long Term Equity Plan ("LTEP Plan") and vest on or before December 31st of the third calendar year after the year in which the services corresponding to such share unit award were performed. As RSUs are typically granted in the first quarter of each year, their vesting period is typically slightly less than three years. RSUs granted under the LTEP Plan may be settled in the form of Hudbay 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 terminate when an employee ceases to be employed by the Group. Valuations of RSUs 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 employees unconditionally became entitled to the awards. 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. The Group 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.
Earnings per share [Policy Text Block]	(r) 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 Group 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.
Leases [Policy Text Block]	(s) Finance leases, under which substantially all the risks and rewards incidental to ownership of the leased item are transferred to the Group, 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. Under operating lease arrangements, the risks and rewards incidental to ownership are not transferred to the Group. Operating lease payments are recognized as an expense in the consolidated income statements on a straight-line basis over the lease term.
Segment reporting [Policy Text Block]	(t) An operating segment is a component of the Group that engages in business activities from which it may earn revenue and incur expenses and for which discrete financial information is available. The Group'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, the Group considers location and decision-making authorities. Refer to note 30.
Statements of cash flows [Policy Text Block]	(u) The Group presents interest paid and dividends paid as financing activities, except if the interest is related to capitalized borrowing costs, and interest received is presented as an investing activity in the consolidated statements of cash flow. The Group presents the consolidated statements of cash flows using the indirect method.

Significant accounting polici_2

Significant accounting policies (Tables)	12 Months Ended
	Dec. 31, 2019
Significant Accounting Policies [Abstract]
Disclosure of detailed information about estimated useful life or depreciation rate [Table Text Block]	• • • • • • •

New standards (Tables)

New standards (Tables)	12 Months Ended
	Dec. 31, 2019
Disclosure of changes in accounting estimates [abstract]
Disclosure of detailed information about new standards adopted, impact summary consolidated balance sheet [Table Text Block]	As reported Adjustment Revised opening Property, plant & equipment, carrying value $ 3,819,812 $ 14,980 $ 3,834,792 Lease Liability (current) 20,472 4,949 25,421 Lease Liability (non-current) 53,763 10,031 63,794
Disclosure of detailed information about new standards adopted, change in opening lease liability balances [Table Text Block]	Jan. 1, 2019 Total minimum lease payments - lease liabilities, Dec, 31, 2018 $ 78,174 Newly capitalized leases, IFRS 16 17,708 Total minimum lease payments - lease liabilities, Jan. 1, 2019 95,882 Effect of discounting (6,667 ) Present value of minimum lease payments 89,215 Less: current portion (25,421 ) $ 63,794
Disclosure of detailed information about new standards adopted, reconciliation of operating leases [Table Text Block]	Operating lease commitments, Dec. 31, 2018 $ 63,448 Less: short term leases - expedient (3,663 ) Less: low value leases - expedient (10 ) Less: variable consideration leases 1 (46,120 ) Add: inclusion of non - lease components (election) and expected term extensions 4,053 Lease commitments - capitalizable leases, Jan. 1, 2019 17,708 Effect of discounting (2,728 ) Newly capitalized leases at January 1, 2019 $ 14,980 1

Acquisition of remaining inte_2

Acquisition of remaining interest in the Rosemont project (Tables)	12 Months Ended
	Dec. 31, 2019
Disclosure of detailed information about business combination [abstract]
Disclosure of detailed information about acquisition date fair value of consideration paid [Table Text Block]	Cash $ 45,000 Present value of future cash installments 23,557 Total consideration $ 68,557
Disclosure of detailed information about acquisition of remaining asset and liabilities [Table Text Block]	Current assets $ 343 Non-current assets 68,904 Liabilities (690 ) Net assets acquired $ 68,557

Revenue and expenses (Tables)

Revenue and expenses (Tables)	12 Months Ended
	Dec. 31, 2019
Analysis of income and expense [abstract]
Disclosure of detailed information about revenue [Table Text Block]	Year ended December 31, 2019 2018 Copper $ 786,332 $ 963,063 Zinc 284,897 357,396 Gold 152,394 149,043 Silver 89,685 85,808 Molybdenum 31,270 20,995 Other 4,760 4,726 1,349,338 1,581,031 Variable consideration adjustments 1 (16,295 ) (2,655 ) Pricing and volume adjustments 2 (12,123 ) (4,101 ) 1,320,920 1,574,275 Treatment and refining charges (83,481 ) (101,909 ) $ 1,237,439 $ 1,472,366 1 2
Disclosure of detailed information about depreciation and amortization expense [Table Text Block]	Year ended December 31, 2019 2018 Cost of sales $ 344,555 $ 332,667 Selling and administrative expenses 2,079 477 $ 346,634 $ 333,144
Disclosure of detailed information about share-based expense (recoveries) expenses [Table Text Block]	Cash-settled Total share-based payment expense RSUs DSUs Year ended December 31, 2019 Cost of sales $ 400 $ - $ 400 Selling and administrative 928 1,157 2,085 Other operating 229 - 229 $ 1,557 $ 1,157 $ 2,714 Year ended December 31, 2018 Cost of sales $ 160 $ - $ 160 Selling and administrative (702 ) (1,877 ) (2,579 ) Other operating 46 - 46 $ (496 ) $ (1,877 ) $ (2,373 )
Disclosure of detailed information about other operating expense [Table Text Block]	Year ended December 31, 2019 2018 Write down of UCM receivable (note 5) $ 25,978 $ - Regional costs 3,780 4,673 Pampacancha delivery obligation 7,499 7,218 Pension settlement loss (note 20) 96 2,163 Loss on disposal of property,plant & equipment 4,807 7,189 Closure cost adjustment 2,289 (425 ) Allocation of community costs 2,216 - Other 4,451 (1,747 ) $ 51,116 $ 19,071
Disclosure of detailed information about impairment [Table Text Block]	Arizona Pre-tax impairment to: Property, plant & equipment (note 12) 322,249 Tax impact - (recovery) (80,143 ) After-tax impairment charge $ 242,106
Disclosure of detailed information about employee benefits expense [Table Text Block]	Year ended December 31, 2019 2018 Current employee benefits $ 169,663 $ 176,571 Profit-sharing plan expense 1,510 9,228 Share-based payments (notes 6c, 19, 24) Cash-settled restricted share units 1,557 (496 ) Cash-settled deferred share units 1,157 (1,877 ) Employee share purchase plan 1,645 1,533 Post-employee pension benefits Defined benefit plans 10,643 12,295 Defined contribution plans 1,635 1,511 Past service costs - 383 Other post-retirement employee benefits 8,457 9,248 Termination benefits 628 1,206 $ 196,895 $ 209,602
Disclosure of detailed information about finance income and expenses [Table Text Block]	Year ended December 31, 2019 2018 Finance income $ (8,527 ) $ (8,450 ) Finance expenses Interest expense on long-term debt 78,265 77,783 Accretion on financial liabilities at amortized cost 1,222 1,244 Finance costs on deferred revenue (note 18) 69,772 64,921 Unwinding of discounts on provisions 4,392 4,684 Withholding taxes 8,100 9,424 Other finance expense 11,027 7,116 172,778 165,172 Interest capitalized (9,890 ) (13,172 ) 162,888 152,000 Other finance losses (gains) Net foreign exchange losses (gains) 1,388 (11,067 ) Change in fair value of financial assets and liabilities at fair value through profit or loss: Hudbay warrants - (6,748 ) Embedded derivatives 3,708 (1,514 ) Investments 4,539 3,798 9,635 (15,531 ) Net finance expense $ 163,996 $ 128,019

Cash and cash equivalents (Tabl

Cash and cash equivalents (Tables)	12 Months Ended
	Dec. 31, 2019
Cash and cash equivalents [abstract]
Disclosure of detailed information about cash and cash equivalents [Table Text Block]	Dec. 31, 2019 Dec. 31, 2018 Cash on hand and demand deposits $ 396,146 $ 515,497 Short-term money market instruments with maturities of of three months or less at acquisition date - - $ 396,146 $ 515,497

Trade and other receivables (Ta

Trade and other receivables (Tables)	12 Months Ended
	Dec. 31, 2019
Trade and other receivables [abstract]
Disclosure of detailed information about trade and other receivables [Table Text Block]	Dec. 31, 2019 Dec. 31, 2018 Current Trade receivables $ 87,332 $ 102,112 Statutory receivables 16,543 12,764 Other receivables 2,119 2,277 105,994 117,153 Non-current Taxes receivable 17,669 17,199 Receivable from joint venture partners (note 5) - 20,404 Other receivables 1,595 1,518 19,264 39,121 $ 125,258 $ 156,274

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2019
Disclosure Of Inventories [Abstract]
Disclosure of detailed information about inventories [Table Text Block]	Dec. 31, 2019 Dec. 31, 2018 Current Stockpile $ 10,396 $ 5,463 Work in progress 14,420 1,762 Finished goods 62,230 62,546 Materials and supplies 51,774 48,703 138,820 118,474 Non-current Stockpile 14,626 14,730 Materials and supplies 4,829 4,746 19,455 19,476 $ 158,275 $ 137,950

Other financial assets (Tables)

Other financial assets (Tables)	12 Months Ended
	Dec. 31, 2019
Other Financial Assets [Abstract]
Disclosure of detailed information about other financial assets [Table Text Block]	Dec. 31, 2019 Dec. 31, 2018 Current Derivative assets $ 1,712 $ 6,628 Restricted cash 337 3,738 2,049 10,366 Non-current Investments at fair value through profit or loss 11,287 15,159 $ 13,336 $ 25,525

Intangible assets - computer so

Intangible assets - computer software (Tables)	12 Months Ended
	Dec. 31, 2019
Disclosure of detailed information about intangible assets [abstract]
Disclosure of detailed information about intangible assets [Table Text Block]	Dec. 31, 2019 Dec. 31, 2018 Cost Balance, beginning of year 18,557 $ 19,169 Additions 2,325 590 Disposals (96 ) - Effects of movement in exchange rates 752 (1,202 ) Balance, end of year 21,538 18,557 Accumulated amortization Balance, beginning of year 14,395 13,594 Additions 1,606 1,793 Disposals (96 ) - Effects of movement in exchange rates 606 (992 ) Balance, end of year 16,511 14,395 Intangibles, net book value $ 5,027 $ 4,162

Property, plant and equipment (

Property, plant and equipment (Tables)	12 Months Ended
	Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [abstract]
Disclosure of detailed information about property, plant and equipment [Table Text Block]	Dec. 31, 2019 Exploration and evaluation assets Capital works in progress Mining properties Plant and equipment Plant and equipment- ROU assets Total Balance, Jan. 1, 2019 $ 52,206 $ 873,781 $ 1,998,439 $ 2,473,176 $ 180,151 $ 5,577,753 Additions 17,016 109,372 - 33,309 22,158 181,855 Acquisition (note 5) - 91,332 3,157 - 373 94,862 Capitalized stripping and development - - 103,108 - - 103,108 Decommissioning and restoration - 41 3,314 86,053 - 89,408 Interest capitalized - 9,890 - - - 9,890 Transfers and other movements - (30,000 ) 642 30,406 (1,048 ) - Impairment (note 6e) - (322,249 ) - - - (322,249 ) Disposals - (2,029 ) - (10,747 ) (1,533 ) (14,309 ) Effects of movements in exchange rates 681 1,528 41,080 38,452 1,793 83,534 Other - 2,208 (3,157 ) 3,103 78 2,232 Balance, Dec. 31, 2019 69,903 733,874 2,146,583 2,653,752 201,972 5,806,084 Accumulated depreciation Balance, Jan. 1, 2019 - - 780,754 872,330 89,877 1,742,961 Depreciation for the year - - 154,970 179,062 19,850 353,882 Disposals - - - (6,675 ) - (6,675 ) Effects of movement in exchange rates - - 27,806 24,970 581 53,357 Balance, Dec. 31, 2019 - - 963,530 1,069,687 110,308 2,143,525 Net book value $ 69,903 $ 733,874 $ 1,183,053 $ 1,584,065 $ 91,664 $ 3,662,559 Dec. 31, 2018 Exploration and evaluation assets Capital works in progress Mining properties Plant and equipment Plant and equipment- ROU assets 1 Total Balance, Dec. 31, 2017 $ 23,010 $ 933,531 $ 1,975,061 $ 2,536,019 $ - $ 5,467,621 Additions 9,950 88,920 - 16,689 - 115,559 Acquisitions 21,654 - - - - 21,654 Capitalized stripping and development - - 84,023 - - 84,023 Decommissioning and restoration - 15 1,711 7,272 - 8,998 Interest capitalized - 13,172 - - - 13,172 Transfers and other movements - (152,781 ) 2,132 150,649 - - Disposals (1,208 ) (4,034 ) - (9,749 ) - (14,991 ) Effects of movements in exchange rates (1,197 ) (3,873 ) (65,434 ) (62,757 ) - (133,261 ) Other (3 ) (1,169 ) 946 224 - (2 ) Balance, Dec. 31, 2018 52,206 873,781 1,998,439 2,638,347 - 5,562,773 IFRS 16 Adjustments 1 - - - (165,171 ) 180,151 14,980 Balance, Jan. 1, 2019 52,206 873,781 1,998,439 2,473,176 180,151 5,577,753 Accumulated depreciation Balance, Dec. 31, 2017 - - 683,183 820,205 - 1,503,388 Depreciation for the year - - 141,218 189,354 - 330,572 Disposals - - - (6,780 ) - (6,780 ) Effects of movement in exchange rates - - (43,469 ) (40,211 ) - (83,680 ) Other - - (178 ) (361 ) - (539 ) Balance, Dec. 31, 2018 - - 780,754 962,207 - 1,742,961 IFRS 16 Adjustments 1 - - - (89,877 ) 89,877 - Balance, Jan. 1, 2019 - - 780,754 872,330 89,877 1,742,961 Net book value, Dec.31, 2018 52,206 873,781 1,217,685 1,676,140 - 3,819,812 Net book value, Jan.1, 2019 $ 52,206 $ 873,781 $ 1,217,685 $ 1,600,846 $ 90,274 $ 3,834,792 1
Disclosure of detailed information about sensitivity analysis for property, plant and equipment [Table Text Block]	Decrease in FVLCD as at Change in key assumption Sep. 30, 2019 Decrease of 10% in the average LOM copper prices $ 308,148 1.0 percentage point increase in the real discount rate 135,733 One year additional delay in the start of project construction 76,921

Trade and other payables (Table

Trade and other payables (Tables)	12 Months Ended
	Dec. 31, 2019
Trade and other payables [abstract]
Disclosure of detailed information about trade and other payables [Table Text Block]	Dec. 31, 2019 Dec. 31, 2018 Trade payables $ 68,742 $ 61,395 Accruals and payables 80,375 68,386 Accrued interest 34,603 34,662 Exploration and evaluation payables 884 185 Statutory payables 7,800 7,324 $ 192,404 $ 171,952

Other liabilities (Tables)

Other liabilities (Tables)	12 Months Ended
	Dec. 31, 2019
Miscellaneous current liabilities [abstract]
Disclosure of detailed information about other current liabilities [Table Text Block]	Dec. 31, 2019 Dec. 31, 2018 Current Provisions (note 19) $ 33,575 $ 14,276 Pension liability (note 20) 12,015 11,854 Other employee benefits (note 21) 2,806 2,564 Unearned revenue 1,015 1,857 $ 49,411 $ 30,551

Other financial liabilities (Ta

Other financial liabilities (Tables)	12 Months Ended
	Dec. 31, 2019
Disclosure of financial liabilities [abstract]
Disclosure of detailed information about other financial liabilities [Table Text Block]	Dec. 31, 2019 Dec. 31, 2018 Current Derivative liabilities $ 10,295 $ 2,634 Other financial liabilities at amortized cost 8,707 2,590 Embedded derivatives (note 26c) 9,074 7,201 28,076 12,425 Non-current Deferred Rosemont acquisition consideration (note 5) 24,491 - Other financial liabilities at amortized cost 15,293 18,771 39,784 18,771 $ 67,860 $ 31,196

Lease Liability (Tables)

Lease Liability (Tables)	12 Months Ended
	Dec. 31, 2019
Lease liabilities [abstract]
Disclosure of detailed information about leasing activities for lessee [Table Text Block]	Dec. 31, 2019 Dec. 31, 2018 Total minimum lease payments - lease liabilities $ 88,096 $ 78,174 Effect of discounting (6,149 ) (3,939 ) Present value of minimum lease payments 81,947 74,235 Less: current portion (32,781 ) (20,472 ) $ 49,166 $ 53,763 Minimum payments under leases: Less than 12 months $ 27,557 $ 18,448 13 - 36 months 48,503 40,615 37 - 60 months 7,798 19,111 More than 60 months 4,238 - $ 88,096 $ 78,174
Disclosure of detailed information about expenses recognized to leases for which exemption applied [Table Text Block]	Year ended Dec. 31, 2019 Short-term leases $ 45,745 Low value leases 92 Variable leases 56,152 Total $ 101,989

Long-term debt (Tables)

Long-term debt (Tables)	12 Months Ended
	Dec. 31, 2019
Disclosure of detailed information about borrowings [line items]
Disclosure of borrowings [Table Text Block]	Dec. 31, 2019 Dec. 31, 2018 Senior unsecured notes (a) $ 991,558 $ 989,306 Less: Unamortized transaction costs - revolving credit facilities (b) (6,303 ) (8,276 ) $ 985,255 $ 981,030
Senior unsecured notes [Member]
Disclosure of detailed information about borrowings [line items]
Disclosure of detailed information about borrowings [Table Text Block]	Balance, January 1, 2018 $ 987,903 Change in fair value of embedded derivative (prepayment option) 316 Accretion of transaction costs and premiums 1,087 Balance, December 31, 2018 $ 989,306 Change in fair value of embedded derivative (prepayment option) 1,079 Accretion of transaction costs and premiums 1,173 Balance, December 31, 2019 $ 991,558
Unamortized transaction costs - revolving credit facilities [Member]
Disclosure of detailed information about borrowings [line items]
Disclosure of detailed information about unamortized transaction costs - revolving credit facilities [Table Text Block]	Balance, January 1, 2018 $ 8,328 Accretion of transaction costs (1,946 ) Transaction costs 1,894 Balance, December 31, 2018 $ 8,276 Accretion of transaction costs (2,342 ) Transaction costs 369 Balance, December 31, 2019 $ 6,303

Deferred revenue (Tables)

Deferred revenue (Tables)	12 Months Ended
	Dec. 31, 2019
Disclosure of deferred revenue [abstract]
Disclosure of detailed information about changes in deferred revenue [Table Text Block]	Balance, January 1, 2018 $ 601,930 Amortization of deferred revenue Liability drawdown (96,038 ) Variable consideration adjustment 2,655 Finance costs 64,921 Effects of changes in foreign exchange (7,390 ) Balance, December 31, 2018 $ 566,078 Amortization of deferred revenue Liability drawdown (92,398 ) Variable consideration adjustment 16,295 Finance costs (note 6g) Current year additions 63,725 Variable consideration adjustment 6,047 Effects of changes in foreign exchange 4,009 Balance, December 31, 2019 $ 563,756
Disclosure of detailed information about deferred revenue [Table Text Block]	Dec. 31, 2019 Dec. 31, 2018 Current $ 86,933 $ 86,256 Non-current 476,823 479,822 $ 563,756 $ 566,078

Provisions (Tables)

Provisions (Tables)	12 Months Ended
	Dec. 31, 2019
Disclosure of other provisions [abstract]
Disclosure of detailed information about changes in provisions [Table Text Block]	Decommis-sioning, restoration and similar liabilities Deferred share units (note 24a) Restricted share units 1 (note 24a) Other Total Balance, January 1, 2019 $ 202,024 $ 4,288 $ 12,201 $ 411 $ 218,924 Net additional provisions made 68,881 1,479 2,885 2,882 76,127 Amounts used (4,136 ) (1,668 ) (9,380 ) (341 ) (15,525 ) Unwinding of discount (note 6g) 4,392 - - - 4,392 Effect of change in discount rate 23,635 - - - 23,635 Effect of foreign exchange 7,320 99 225 4 7,648 Effect of change in share price - (322 ) (454 ) - (776 ) Balance, December 31, 2019 $ 302,116 $ 3,876 $ 5,477 $ 2,956 $ 314,425 1 Decommis-sioning, restoration and similar liabilities Deferred share units (note 24a) Restricted share units 1 Other Total Balance, January 1, 2018 $ 200,041 $ 6,623 $ 19,409 $ 1,435 $ 227,508 Net additional provisions made 9,031 973 7,493 - 17,497 Amounts used (188 ) - (6,435 ) (770 ) (7,393 ) Unwinding of discount (note 6g) 4,684 - - - 4,684 Effect of change in discount rate (462 ) - - - (462 ) Effect of foreign exchange (11,082 ) (458 ) (973 ) (74 ) (12,587 ) Effect of change in share price - (2,850 ) (7,293 ) (180 ) (10,323 ) Balance, December 31, 2018 $ 202,024 $ 4,288 $ 12,201 $ 411 $ 218,924 1
Disclosure of detailed information about provisions [Table Text Block]	December 31, 2019 Decommis-sioning, restoration and similar liabilities Deferred share units (note 24a) Restricted share units 1 (note 24a) Other Total Current (note 14) $ 23,621 $ 3,876 $ 4,468 $ 1,610 $ 33,575 Non-current 278,495 - 1,009 1,346 280,850 $ 302,116 $ 3,876 $ 5,477 $ 2,956 $ 314,425 December 31, 2018 Decommis-sioning, restoration and similar liabilities Deferred share units (note 24a) Restricted share units1 (note 24a) Other Total Current (note 14) $ 1,234 $ 4,288 $ 8,412 $ 342 $ 14,276 Non-current 200,790 - 3,789 69 204,648 $ 202,024 $ 4,288 $ 12,201 $ 411 $ 218,924

Pension obligations (Tables)

Pension obligations (Tables)	12 Months Ended
	Dec. 31, 2019
Pension Obligations [Abstract]
Disclosure of additional information about defined benefit plans [Table Text Block]	Year ended Dec. 31, 2019 Dec. 31, 2018 Opening defined benefit obligation: $ 211,512 $ 383,054 Current service costs 9,880 11,032 Past service cost related to the new collective bargaining agreement - 383 Interest cost 7,156 12,009 Benefits paid from plan (16,745 ) (29,499 ) Benefits paid from employer (934 ) (1,998 ) Participant contributions 64 98 Effects of movements in exchange rates 10,814 (32,015 ) Remeasurement actuarial (gains)/losses: Arising from changes in demographic assumptions - - Arising from changes in financial assumptions 30,455 (11,585 ) Arising from experience adjustments (2,258 ) (2,112 ) Settlement payments from plan assets (6,307 ) (120,018 ) Loss on settlement (note 6d) 96 2,163 Closing defined benefit obligation $ 243,733 $ 211,512
Disclosure of detailed information about defined benefit plans, balance by member group [Table Text Block]	Dec. 31, 2019 Dec. 31, 2018 Active members $ 231,959 $ 200,591 Deferred members 1,555 723 Retired members 10,219 10,198 Closing defined benefit obligation $ 243,733 $ 211,512
Disclosure of detailed information about changes in fair value of plan assets [Table Text Block]	Year ended Dec. 31, 2019 Dec. 31, 2018 Opening fair value of plan assets: $ 175,795 $ 341,432 Interest income 6,170 11,033 Remeasurements losses: Return on plan assets (excluding amounts included in net interest expense) 21,460 (15,296 ) Contributions from the employer 11,952 17,020 Employer direct benefit payments 934 1,998 Contributions from plan participants 64 98 Benefit payment from employer (934 ) (1,998 ) Administrative expenses paid from plan assets (82 ) (83 ) Benefits paid (16,745 ) (29,499 ) Settlement payments from plan assets (6,307 ) (120,018 ) Effects of changes in foreign exchange rates 9,812 (28,892 ) Closing fair value of plan assets $ 202,119 $ 175,795
Disclosure of detailed information about net defined benefit liability (asset) [Table Text Block]	Dec. 31, 2019 Dec. 31, 2018 Present value of funded defined benefit obligation $ 224,364 $ 195,283 Fair value of plan assets (202,119 ) (175,795 ) Present value of unfunded defined benefit obligation 19,369 16,229 Net liability arising from defined benefit obligation $ 41,614 $ 35,717
Disclosure of detailed information about pension obligation [Table Text Block]	Dec. 31, 2019 Dec. 31, 2018 Pension obligation - current (note 14) $ 12,015 $ 11,854 Pension obligation - non-current 29,599 23,863 Total pension obligation $ 41,614 $ 35,717
Disclosure of detailed information about pension expense [Table Text Block]	Dec. 31, 2019 Dec. 31, 2018 Service costs: Current service cost $ 9,880 $ 11,032 Past service cost - 383 Loss on settlement (note 6d) 96 2,163 Total service cost 9,976 13,578 Net interest expense 986 976 Administration cost 82 83 Defined benefit pension expense $ 11,044 $ 14,637 Defined contribution pension expense $ 1,639 $ 1,469
Disclosure of detailed information about remeasurement on the net defined benefit liability [Table Text Block]	Dec. 31, 2019 Dec. 31, 2018 (Return)/loss on plan assets (excluding amounts included in net interest expense) $ (21,460 ) $ 15,296 Actuarial gains arising from changes in demographic assumptions - - Actuarial losses/(gains) arising from changes in financial assumptions 29,609 (11,585 ) Actuarial gains arising from experience adjustments (2,258 ) (2,112 ) Defined benefit loss/(gain) related to remeasurement $ 5,891 $ 1,599 Total pension cost $ 18,574 $ 17,705
Disclosure of detailed information about defined benefit plan, assumptions used [Table Text Block]	2019 2018 Defined benefit cost: Discount rate - benefit obligations 3.73 % 3.45 % Discount rate - service cost 3.75 % 3.50 % Expected rate of salary increase 1 2.75 % 2.75 % Average longevity at retirement age for current pensioners (years) 2 Males 21.1 21.0 Females 23.9 23.7 Defined benefit obligation: Discount rate 3.08 % 3.73 % Expected rate of salary increase 1 2.75 % 2.75 % Average longevity at retirement age for current pensioners (years) 2 Males 21.2 21.1 Females 23.9 23.9 Average longevity at retirement age for current employees (future pensioners) (years) 2 Males 23.0 23.0 Females 25.6 25.6
Disclosure of fair value of plan assets [Table Text Block]	December 31, 2019 Level 1 Level 2 Level 3 Total Investments: Money market instruments $ 1,588 $ - $ - $ 1,588 Pooled equity funds 76,680 - - 76,680 Pooled fixed income funds - 103,646 - 103,646 Alternative investment funds - 19,438 - 19,438 Balanced funds - 767 - 767 $ 78,268 $ 123,851 $ - $ 202,119 December 31, 2018 Level 1 Level 2 Level 3 Total Investments: Money market instruments $ 3,072 $ - $ - $ 3,072 Pooled equity funds 53,329 - - 53,329 Pooled fixed income funds - 91,854 - 91,854 Alternative investment funds - 26,871 - 26,871 Balanced funds - 669 - 669 $ 56,401 $ 119,394 $ - $ 175,795

Other employee benefits (Tables

Other employee benefits (Tables)	12 Months Ended
	Dec. 31, 2019
Other Employee Benefits [Abstract]
Disclosure of detailed information about other employee benefit plans [Table Text Block]	Year ended Dec. 31, 2019 Dec. 31, 2018 Opening defined benefit obligation $ 93,528 $ 107,829 Current service cost 1 3,060 3,455 Past service cost - 255 Interest cost 3,600 3,683 Effects of movements in exchange rates 4,864 (8,587 ) Remeasurement actuarial (gains)/losses: Arising from changes in demographic assumptions - (9,996 ) Arising from changes in financial assumptions 14,094 2,809 Arising from experience adjustments 87 (3,472 ) Benefits paid (2,537 ) (2,448 ) Closing defined benefit obligation $ 116,696 $ 93,528 1
Disclosure of detailed information about other employee benefit plans, balance by member group [Table Text Block]	Dec. 31, 2019 Dec. 31, 2018 Active members $ 60,801 $ 47,249 Inactive members 55,895 46,279 Closing defined benefit obligation $ 116,696 $ 93,528
Disclosure of detailed information about changes in fair value of assets of other employee benefits plan [Table Text Block]	Dec. 31, 2019 Dec. 31, 2018 Employer contributions $ 2,537 $ 2,448 Benefits paid (2,537 ) (2,448 ) Closing fair value of assets $ - $ -
Disclosure of detailed information about net benefit liability for other employee benefits [Table Text Block]	Dec. 31, 2019 Dec. 31, 2018 Unfunded benefit obligation $ 116,696 $ 93,528 Vacation accrual and other - non-current 2,888 2,664 Net liability $ 119,584 $ 96,192
Disclosure of detailed information about other employee benefits plan [Table Text Block]	Dec. 31, 2019 Dec. 31, 2018 Other employee benefits liability - current (note 14) $ 2,806 $ 2,564 Other employee benefits liability - non-current 116,778 93,628 Net liability $ 119,584 $ 96,192
Disclosure of detailed information about employee future benefit expense [Table Text Block]	Dec. 31, 2019 Dec. 31, 2018 Current service cost 1 $ 3,060 $ 3,710 Net interest cost 3,600 3,683 Components recognized in consolidated income statements $ 6,660 $ 7,393 1
Disclosure of detailed information about remeasurement of other long term employee benefits [Table Text Block]	Dec. 31, 2019 Dec. 31, 2018 Remeasurement on the net defined benefit liability: Actuarial (gains)/losses arising from changes in demographic assumptions $ - $ (9,996 ) Actuarial (gains)/losses arising from changes in financial assumptions 14,094 2,809 Actuarial gains arising from changes experience adjustments 87 (3,472 ) Components recognized in statements of comprehensive income $ 14,181 $ (10,659 ) Total other employee future benefit cost $ 20,841 $ (3,266 )
Disclosure of detailed information about other employee benefit plan, assumptions used [Table Text Block]	Dec. 31, 2019 Dec. 31, 2018 Defined benefit cost: Discount rate 3.88 % 3.64 % Initial weighted average health care trend rate 5.74 % 5.97 % Ultimate weighted average health care trend rate 4.00 % 4.00 % Average longevity at retirement age for current pensioners (years) 1 Males 21.1 21.0 Females 23.9 23.7 Dec. 31, 2019 Dec. 31, 2018 Defined benefit obligation: Discount rate 3.17 % 3.88 % Initial weighted average health care trend rate 5.68 % 5.74 % Ultimate weighted average health care trend rate 4.00 % 4.00 % Average longevity at retirement age for current pensioners (years) 1 Males 21.2 21.1 Females 23.9 23.9 Average longevity at retirement age for current employees (future pensioners) (years) 1 Males 23.1 23.0 Females 25.6 25.6 1

Income and mining taxes (Tables

Income and mining taxes (Tables)	12 Months Ended
	Dec. 31, 2019
Major components of tax expense (income) [abstract]
Disclosure of detailed information about effective income tax expense recovery [Table Text Block]	Year ended December 31, 2019 2018 Current: Income taxes Canada $ 11,196 $ 5,251 Peru 13,723 19,103 Mining taxes Canada 341 9,085 Peru 4,379 11,030 Adjustments in respect of prior years 6,273 707 35,912 45,176 Deferred: Income taxes (recoveries) - origination, revaluation and/or and reversal of temporary differences Canada (59,082 ) 25,811 Peru (6,280 ) 10,780 United States (68,106 ) 3,170 Mining taxes (recoveries) - origination, revaluation and/or reversal of temporary difference Canada (10,266 ) 414 Peru (1,948 ) (621 ) Adjustments in respect of prior years 817 691 (144,865 ) 40,245 $ (108,953 ) $ 85,421
Disclosure of detailed information about deferred taxes [Table Text Block]	Dec. 31, 2019 Dec. 31, 2018 Deferred income tax asset Canada $ 69,950 $ 15,513 Deferred income tax liability Peru (191,611 ) (196,452 ) United States (41,607 ) (110,861 ) Deferred mining tax asset (liability) Canada 5,095 (5,119 ) Peru (9,709 ) (11,658 ) (237,832 ) (324,090 ) Net deferred tax liability balance, end of year $ (167,882 ) $ (308,577 )
Disclosure of detailed information about changes in deferred tax assets and liabilities [Table Text Block]	Year ended Dec. 31, 2019 Year ended Dec. 31, 2018 Net deferred tax liability balance, beginning of year $ (308,577 ) $ (277,466 ) Deferred tax recovery (expense) 144,865 (40,245 ) OCI transactions 1,878 520 Foreign currency translation on the deferred tax liability (6,048 ) 8,614 Net deferred tax liability balance, end of year $ (167,882 ) $ (308,577 )
Disclosure of detailed information about reconciliation to statutory tax rate [Table Text Block]	Year ended December 31, 2019 2018 Statutory tax rate 27.00 % 27.00 % Tax expense at statutory rate $ (122,246 ) $ 46,126 Effect of: Deductions related to mining taxes (1,493 ) (5,976 ) Adjusted income taxes (123,739 ) 40,150 Mining tax (recovery) expense (6,674 ) 19,214 (130,413 ) 59,364 Permanent differences related to: Capital items 3,270 (2,903 ) Other income taxes permanent differences 1,747 (454 ) Impact of remeasurement on decommissioning liability (16,265 ) 3,898 Temporary income tax differences not recognized 6,219 4,449 Non-deductible impairment on UCM receivable 7,041 - Withholding tax on dividend 6,826 - Impact related to differences in tax rates in foreign operations 20,338 9,594 Impact of changes in statutory tax rates (259 ) 45 Foreign exchange on non-monetary items (6,633 ) 11,408 Impact related to tax assessment and tax return amendments (824 ) 20 Tax (recovery) expense $ (108,953 ) $ 85,421
Disclosure of temporary differences recognized [Table Text Block]	Balance sheet Income Statement Dec.31, 2019 Dec. 31, 2018 Dec.31, 2019 Dec. 31, 2018 Deferred income tax (liability) asset/expense (recovery) Property, plant and equipment $ (96,841 ) $ (83,407 ) $ 13,434 $ (18,646 ) Pension obligation 11,332 7,817 (1,115 ) 2,739 Other employee benefits 16,837 13,488 (3,349 ) 3,254 Decommissioning and restoration obligation 41,208 7,817 (33,391 ) (2,055 ) Non-capital losses 90,446 72,470 (17,976 ) 19,025 Share issuance and debt costs 6,540 10,896 4,361 4,807 Deferred revenue (112 ) (7,622 ) (7,510 ) 5,096 Other 540 (5,946 ) (12,839 ) 4,640 Deferred income tax asset/expense (recovery) 69,950 15,513 (58,385 ) 18,860 Deferred income tax liability (assets)/(recovery) expense Property, plant and equipment 259,145 339,037 (79,892 ) 25,456 Other employee benefits (80 ) 240 (320 ) 48 Asset retirement obligations (833 ) (918 ) 85 (129 ) Non-capital losses (28,643 ) (27,374 ) (1,269 ) 165 Other 3,629 (3,672 ) 7,302 (3,439 ) Deferred income tax liability/(recovery) expense 233,218 307,313 (74,094 ) 22,101 Deferred income tax liability/(recovery) expense $ (163,268 ) $ (291,800 ) $ (132,479 ) $ 40,961
Disclosure of detailed information about temporary differences not recognized [Table Text Block]	Dec. 31, 2019 Dec. 31, 2018 Property, plant and equipment $ 33,269 $ - Capital losses 159,545 200,455 Other employee benefits 68,866 77,166 Asset retirement obligations 146,679 175,091 Non-capital losses 122,979 116,542 Temporary differences not recognized $ 531,338 $ 569,254
Disclosure of detailed information about temporary differences - deferred mining tax assets and liabilities [Table Text Block]	Dec. 31, 2019 Dec. 31, 2018 Canada Property, plant and equipment $ 5,095 $ (5,119 ) Dec. 31, 2019 Dec. 31, 2018 Peru Property, plant and equipment $ (9,710 ) $ (11,658 )

Share capital (Tables)

Share capital (Tables)	12 Months Ended
	Dec. 31, 2019
Disclosure of classes of share capital [abstract]
Disclosure of detailed information about shares, activity [Table Text Block]	Year ended Dec. 31, 2019 Year ended Dec. 31, 2018 Common shares Amount Common shares Amount Balance, beginning of year 261,272,151 $ 1,777,340 261,271,188 $ 1,777,409 Share issue costs, net of tax - - - (80 ) Warrants exercised - - 963 11 Balance, end of year 261,272,151 $ 1,777,340 261,272,151 $ 1,777,340

Share-based payment (Tables)

Share-based payment (Tables)	12 Months Ended
	Dec. 31, 2019
Disclosure of terms and conditions of share-based payment arrangement [line items]
Disclosure of detailed information about number and weighted average exercise prices of share options [Table Text Block]	Year ended Year ended Dec. 31, 2019 Dec. 31, 2018 Number of shares subject to option Weighted-average exercise price C$ Number of shares subject to option Weighted average exercise price C$ Balance, beginning of year - $ - 523,352 $ 15.86 Forfeited - $ - - $ - Expired - $ - (523,352 ) $ 15.86 Balance, end of year - $ - - $ -
Deferred Share Unit [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Disclosure of detailed information about number and weighted average exercise prices of other equity instruments [Table Text Block]	Year ended Dec. 31, 2019 Dec. 31, 2018 Granted during the year: Number of units 337,999 158,886 Weighted average price (C$/unit) $ 5.89 $ 7.91 Expenses (gain) recognized during the year 1 $ 1,157 $ (1,877 ) Payments made during the year (note 19) $ 1,668 $ - 1
Restricted Share Unit [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Disclosure of detailed information about number and weighted average exercise prices of other equity instruments [Table Text Block]	Year ended Dec. 31, 2019 Dec. 31, 2018 Number of units, beginning of year 3,666,867 3,405,713 Number of units granted during the year 1,080,741 1,031,701 Credits for dividends 7,554 9,724 Number of units forfeited during the year (573,914 ) (21,190 ) Number of units vested (1,957,249 ) (759,081 ) Number of units, end of year 1 2,223,999 3,666,867 Weighted average price - granted (C$/unit) $ 8.98 $ 10.33 Expenses (gain) recognized during the year 2 $ 1,557 $ (496 ) Payments made during the year (note 19) $ 9,380 $ 6,435 1 2

Financial instruments (Tables)

Financial instruments (Tables)	12 Months Ended
	Dec. 31, 2019
Financial Instruments [Abstract]
Disclosure of fair value measurement [Table Text Block]	Dec. 31, 2019 Dec. 31, 2018 FV CV FV CV Financial assets at amortized cost Cash and cash equivalents 1 $ 396,146 $ 396,146 $ 515,497 $ 515,497 Restricted cash 1 337 337 3,738 3,738 Fair value through profit or loss Trade and other receivables 1, 2 91,046 91,046 126,311 126,311 Non-hedge derivative assets 3 1,712 1,712 6,628 6,628 Prepayment option - embedded derivatives 7 2,585 2,585 3,664 3,664 Investments at FVTPL 4 11,287 11,287 15,159 15,159 Total financial assets 503,113 503,113 670,997 670,997 Financial liabilities at amortized cost Trade and other payables 1, 2 184,604 184,604 164,628 164,628 Deferred Rosemont acquisition consideration 8 24,491 24,491 - - Other financial liabilities 5 21,338 24,000 17,425 21,361 Senior unsecured notes 6 1,050,126 994,143 988,294 992,970 Fair value through profit or loss - - - - Embedded derivatives 3 9,074 9,074 7,201 7,201 Non-hedge derivative liabilities 3 10,295 10,295 2,634 2,634 Total financial liabilities 1,299,928 1,246,607 1,180,182 1,188,794 Net financial liability $ (796,815 ) $ (743,494 ) $ (509,185 ) $ (517,797 ) 1 2 3 4 5 6 7 8
Disclosure of detailed information about significant unobservable inputs used in fair value measurement of assets and liabilities [Table Text Block]	December 31, 2019 Level 1 Level 2 Level 3 Total Financial assets measured at fair value Financial assets at FVTPL: Non-hedge derivatives $ - $ 1,712 $ - $ 1,712 Investments at FVTPL 11,287 - - 11,287 Prepayment option embedded derivative - 2,585 - 2,585 $ 11,287 $ 4,297 $ - $ 15,584 Financial liabilities measured at fair value Financial liabilities at FVTPL: Embedded derivatives $ - $ 9,074 $ - $ 9,074 Non-hedge derivatives - 10,295 - 10,295 $ - $ 19,369 $ - $ 19,369 December 31, 2018 Level 1 Level 2 Level 3 Total Financial assets measured at fair value Financial assets at FVTPL: Non-hedge derivatives $ - $ 6,628 $ - $ 6,628 Investments at FVTPL 15,159 - - 15,159 Prepayment option embedded derivative - 3,664 - 3,664 $ 15,159 $ 10,292 $ - $ 25,451 Financial liabilities measured at fair value Financial liabilities at FVTPL: Embedded derivatives $ - $ 7,201 $ - $ 7,201 Non-hedge derivatives - 2,634 - 2,634 $ - $ 9,835 $ - $ 9,835
Disclosure of detailed information about net position of contracts awaiting final pricing [Table Text Block]	Sales awaiting final pricing Average YTD price ($/unit) Metal in concentrate Unit Dec. 31, 2019 Dec. 31, 2018 Dec. 31, 2019 Dec. 31, 2018 Copper tonnes 33,102 30,519 2.80 2.69 Zinc tonnes - 199 - 1.13 Gold oz 16,152 15,528 1,522 1,279 Silver oz 124,371 96,646 17.86 15.45
Disclosure of detailed information about foreign currency risk [Table Text Block]	Dec. 31, 2019 Dec. 31, 2018 CAD 1 USD 2 PEN 3 CAD 1 USD 2 PEN 3 Cash and cash equivalent $ 8,394 $ 21,217 $ 7,617 $ 11,498 $ 29,740 $ 13,934 Trade and other receivables 374 56,998 25,413 711 42,056 1,272 Other financial assets 11,287 - - 15,159 - - Trade and other payables (5,719 ) (435 ) (22,618 ) (5,341 ) (3,133 ) (19,513 ) Other financial liabilities - - (24,000 ) - - (21,361 ) $ 14,336 $ 77,780 $ (13,588 ) $ 22,027 $ 68,663 $ (25,668 ) 1 2 3
Disclosure of detailed information about sensitivity analysis for foreign currency risk [Table Text Block]	December 31, 2019 Change of: Would have changed 2019 after-tax profit by: USD/CAD exchange rate 1 + 10% $ 3.4 million USD/CAD exchange rate 1 - 10% (4.1 ) million USD/PEN exchange rate 2 + 10% 0.8 million USD/PEN exchange rate 2 - 10% (1.0 ) million December 31, 2018 Change of: Would have changed 2018 after-tax profit by: USD/CAD exchange rate 1 + 10% $ 5.0 million USD/CAD exchange rate 1 - 10% (6.0 ) million USD/PEN exchange rate 2 + 10% 1.5 million USD/PEN exchange rate 2 - 10% (1.8 ) million
Disclosure of detailed information about commodity price risk [Table Text Block]	December 31, 2019 Change of: Would have changed 2019 after-tax profit by: Copper prices ($/lb) 3 + $ 0.30 $ (2.0 ) million Copper prices ($/lb) 3 - $ 0.30 2.0 million Zinc prices ($/lb) 4 + $ 0.10 1.0 million Zinc prices ($/lb) 4 - $ 0.10 (1.0 ) million December 31, 2018 Change of: Would have changed 2018 after-tax profit by: Copper prices ($/lb) 3 + $ 0.30 $ (3.1) million Copper prices ($/lb) 3 - 3.1 million Zinc prices ($/lb) 4 + $ 0.10 0.5 million Zinc prices ($/lb) 4 - (0.5) million 3 4
Disclosure of detailed information about share price risk [Table Text Block]	December 31, 2019 Change of: Would have changed 2019 after-tax profit by: Share prices + 25% $ 2.8 million Share prices - 25% (2.8 ) million December 31, 2018 Change of: Would have changed 2018 after-tax profit by: Share prices + 25% $ 3.8 million Share prices - 25% (3.8) million
Disclosure of detailed information about interest rate risk [Table Text Block]	December 31, 2019 Change of: Would have changed 2019 after-tax profit by: Interest rates + 2.00% $ 2.3 million Interest rates - 2.00% (2.6 ) million December 31, 2018 Change of: Would have changed 2018 after-tax profit by: Interest rates + 2.00% $ (3.3) million Interest rates - 3.2 million
Disclosure of detailed information about liquidity risk [Table Text Block]	Dec. 31, 2019 Carrying amount Contractual cash flows 12 months or less 13 - 36 months 37 - 60 months More than 60 months Assets used to manage liquidity risk Cash and cash equivalents $ 396,146 $ 396,146 $ 396,146 $ - $ - $ - Restricted cash 337 337 337 - - - Trade and other receivables 91,046 91,046 89,451 - - 1,595 Non-hedge derivative assets 1,712 1,712 1,712 - - - $ 489,241 $ 489,241 $ 487,646 $ - $ - $ 1,595 Non-derivative financial liabilities Trade and other payables, including embedded derivatives $ (184,604 ) $ (184,604 ) $ (184,604 ) $ - $ - $ - Other financial liabilities (24,000 ) (33,723 ) (6,672 ) (4,811 ) (4,734 ) (17,506 ) Deferred Rosemont acquisition consideration (24,491 ) (30,000 ) - (10,000 ) (20,000 ) - Long-term debt, including embedded derivatives (991,558 ) (1,350,540 ) (72,165 ) (149,500 ) (1,128,875 ) - $ (1,224,653 ) $ (1,598,867 ) $ (263,441 ) $ (164,311 ) $ (1,153,609 ) $ (17,506 ) Derivative financial liabilities Embedded derivative (9,074 ) (9,074 ) (9,074 ) - - - Non hedge derivative contracts (10,295 ) (10,295 ) (10,295 ) - - - (19,369 ) (19,369 ) (19,369 ) - - - Dec. 31, 2018 Carrying amount Contractual cash flows 12 months or less 13 - 36 months 37 - 60 months More than 60 months Assets used to manage liquidity risk Cash and cash equivalents $ 515,497 $ 515,497 $ 515,497 $ - $ - $ - Trade and other receivables 126,311 136,913 112,258 11,440 13,215 - Non-hedge derivative assets 6,628 6,628 6,628 - - - $ 648,436 $ 659,038 $ 634,383 $ 11,440 $ 13,215 $ - Non-derivative financial liabilities Trade and other payables, including embedded derivatives $ (164,628 ) $ (164,628 ) $ (164,628 ) $ - $ - $ - Other financial liabilities (21,361 ) (31,854 ) (3,719 ) (4,757 ) (3,068 ) (20,310 ) Long-term debt, including embedded derivatives (981,030 ) (1,439,821 ) (79,263 ) (156,933 ) (535,000 ) (668,625 ) $ (1,167,019 ) $ (1,636,303 ) $ (247,610 ) $ (161,690 ) $ (538,068 ) $ (688,935 ) Derivative financial liabilities Non-hedge derivative contracts (2,634 ) (2,634 ) (2,634 ) - - - $ (2,634 ) $ (2,634 ) $ (2,634 ) $ - $ - $ -

Commitments and contingencies (

Commitments and contingencies (Tables)	12 Months Ended
	Dec. 31, 2019
Disclosure Of Commitments And Contingent Liabilities Abstract
Disclosure of maturity analysis of operating lease payments [Table Text Block]	2019 Within one year $ 57,860 After one year but not more than five years 26,395 More than five years - $ 84,255

Related parties (Tables)

Related parties (Tables)	12 Months Ended
	Dec. 31, 2019
Disclosure of transactions between related parties [abstract]
Disclosure of subsidiaries [Table Text Block]	Beneficial ownership of ultimate controlling party (Hudbay Minerals Inc.) Name Jurisdiction Business Entity's Parent 2019 2018 HudBay Marketing & Sales Inc Canada Marketing and sales HMI 100% 100% HudBay Peru Inc British Columbia Holding company HMI 100% 100% HudBay Peru S.A.C. Peru Exploration/development Peru Inc. 100% 100% HudBay (BVI) Inc. British Virgin Islands Precious metals sales Peru Inc. 100% 100% Hudbay Arizona Inc. British Columbia Holding company HMI 100% 100% Rosemont Copper Company Arizona Exploration/development HudBay Arizona (US) Holding Corporation 100% 100%
Disclosure of information about key management personnel [Table Text Block]	2019 2018 Short-term employee benefits 1 $ 8,319 $ 8,652 Post-employment benefits 762 762 Long-term share-based awards 6,966 5,970 $ 16,047 $ 15,384 1

Supplementary cash flow infor_2

Supplementary cash flow information (Tables)	12 Months Ended
	Dec. 31, 2018
Supplementary Cash Flow Information [Abstract]
Disclosure of detailed information about supplemental cash flow information [Table Text Block]	Year ended December 31, 2019 2018 Change in: Trade and other receivables $ 3,252 $ 16,198 Other financial assets/liabilities 12,540 (17,290 ) Inventories (11,759 ) (32 ) Prepaid expenses (3,484 ) (38 ) Trade and other payables 5,613 (19,608 ) Provisions and other liabilities (2,591 ) (1,030 ) $ 3,572 $ (21,800 )

Segmented information (Tables)

Segmented information (Tables)	12 Months Ended
	Dec. 31, 2019
Disclosure of operating segments [abstract]
Disclosure of segments [Table Text Block]	Year ended December 31, 2019 Manitoba Peru Arizona Corporate and other activities Total Revenue from external customers $ 537,421 $ 700,018 $ - $ - $ 1,237,439 Cost of sales Mine operating costs 385,159 356,183 - - 741,342 Depreciation and amortization 135,429 209,126 - - 344,555 Gross profit 16,833 134,709 - - 151,542 Selling and administrative expenses - - - 36,170 36,170 Exploration and evaluation expenses 18,476 5,804 - 6,494 30,774 Other operating expenses 8,201 14,022 28,149 744 51,116 Impairment loss - - 322,249 - 322,249 Results from operating activities $ (9,844 ) $ 114,883 $ (350,398 ) $ (43,408 ) $ (288,767 ) Finance income (8,527 ) Finance expenses 162,888 Other finance losses 9,635 Loss before tax (452,763 ) Tax recovery (108,953 ) Loss for the year $ (343,810 ) Year ended December 31, 2018 Manitoba Peru Arizona Corporate and other activities Total Revenue from external customers $ 667,322 $ 805,044 $ - $ - $ 1,472,366 Cost of sales Mine operating costs 412,760 353,199 - - 765,959 Depreciation and amortization 121,515 211,152 - - 332,667 Gross profit 133,047 240,693 - - 373,740 Selling and administrative expenses - - - 27,243 27,243 Exploration and evaluation expenses 12,302 5,640 - 10,628 28,570 Other operating expenses 5,433 11,739 539 1,360 19,071 Results from operating activities $ 115,312 $ 223,314 $ (539 ) $ (39,231 ) $ 298,856 Finance income (8,450 ) Finance expenses 152,000 Other finance gain (15,531 ) Profit before tax 170,837 Tax expense 85,421 Profit for the year $ 85,416
Disclosure of segments, assets and liabilities [Table Text Block]	December 31, 2019 Manitoba Peru Arizona Corporate and other activities Total Total assets $ 774,800 $ 2,556,895 $ 700,799 $ 423,467 $ 4,455,961 Total liabilities 551,171 926,642 78,988 1,051,037 2,607,838 Property, plant and equipment 1 684,679 2,253,404 691,538 32,938 3,662,559 1 December 31, 2018 Manitoba Peru Arizona Corporate and other activities Total Total assets $ 621,253 $ 2,751,525 $ 896,693 $ 416,164 $ 4,685,635 Total liabilities 424,576 921,773 115,470 1,044,960 2,506,779 Property, plant and equipment 572,947 2,353,229 868,921 24,715 3,819,812
Disclosure of segments, additions to property, plant and equipment [Table Text Block]	December 31, 2019 Manitoba Peru Arizona Corporate and other activities Total Additions to property, plant and equipment $ 143,418 $ 101,717 $ 38,923 $ 905 $ 284,963 December 31, 2018 Manitoba Peru Arizona Corporate and other activities Total Additions to property, plant and equipment $ 123,896 $ 55,818 $ 19,846 $ 22 $ 199,582
Disclosure of geographical areas, revenue by customer location [Table Text Block]	2019 2018 Revenue by customer location 1 Canada $ 418,636 $ 553,411 United States 209,382 211,681 Switzerland 162,167 253,165 Germany 10,731 52,530 China 158,795 140,440 Peru 110,411 65,721 Philippines 71,506 84,687 United Kingdom 62,462 68,346 Other 33,349 42,385 $ 1,237,439 $ 1,472,366 1

Basis of preparation (Narrative

Basis of preparation (Narrative) (Details)	Apr. 25, 2019
United Copper & Moly LLC ("UCM") [Member] | Rosemont Project [Member]
Basis Of Presentation [Line Items]
Percentage of voting equity interests acquired	7.95%

New standards (Narrative) (Deta

New standards (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Disclosure of changes in accounting estimates [line items]
Right of use assets and lease liabilities		$ 14,980
Bottom of range [Member]
Disclosure of changes in accounting estimates [line items]
Percentage of lease liabilities	1.95%
Top of range [Member]
Disclosure of changes in accounting estimates [line items]
Percentage of lease liabilities	5.13%

Acquisition of remaining inte_3

Acquisition of remaining interest in the Rosemont project (Narrative) (Details) - Agreement with United Copper & Moly LLC ("UCM") [Member] - Rosemont Project [Member] $ in Thousands	Apr. 25, 2019USD ($)
Disclosure of detailed information about business combination [line items]
Percentage of voting equity interests acquired	7.95%
Upfront cash consideration paid	$ 45,000
Commitment to pay three annual installments of per year, commencing July 1, 2022	10,000
Loan receivable balance written off	$ 25,978
Percentage of ownership interest held	100.00%

Revenue and expenses (Narrative

Revenue and expenses (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disclosure Of Revenue And Expenses [Line Items]
Employee share purchase plan, matching contribution, percentage	75.00%	75.00%
Impairment loss recognised in profit or loss, property, plant and equipment	$ 322,249
Bottom of range [member]
Disclosure Of Revenue And Expenses [Line Items]
Employee share purchase plan, contributions, percentage of pre-tax base salary	1.00%	1.00%
Top of range [Member]
Disclosure Of Revenue And Expenses [Line Items]
Employee share purchase plan, contributions, percentage of pre-tax base salary	10.00%	10.00%
Manitoba [Member]
Disclosure Of Revenue And Expenses [Line Items]
Profit sharing plan, percentage	10.00%	10.00%
Peru [Member]
Disclosure Of Revenue And Expenses [Line Items]
Profit sharing plan, percentage	8.00%	8.00%

Inventories (Narrative) (Detail

Inventories (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disclosure Of Inventories [Abstract]
Cost of inventories recognised as expense during period	$ 978,810	$ 975,354

Intangibles and other assets (N

Intangibles and other assets (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Disclosure of detailed information about intangible assets [abstract]
Intangibles and other assets	$ 10,411	$ 4,162
Other assets	5,384
Intangibles assets	$ 5,027	$ 4,162

Property, plant and equipment_2

Property, plant and equipment (Narrative) (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019USD ($)$ / lb	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)$ / lb
Disclosure of detailed information about property, plant and equipment [line items]
Impairment loss		$ 322,249
Cash generating units [Member] | Arizona [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Impairment loss		$ 322,249
Estimated period of time prior to commencement of construction	approximately three years		approximately one year
Explanation of period over which management has projected cash flows	24 years		22 years
Discount rate applied to cash flow projections	9.50%		7.50%
Cash Flow Calculations Utilized Long-Term Copper Price | $ / lb	3.10		3.10
Cash Flow Calculations Utilized Molybdenum Long-Term Prices | $ / lb	11		11
Estimated value of mineral resources not included in LOM	$ 74,969		$ 287,900
Recoverable amount of asset or cash-generating unit	615,368
Amount by which unit's recoverable amount exceeds its carrying amount	$ 242,106

Lease Liability (Narrative) (De

Lease Liability (Narrative) (Details) - Finance lease obligations [Member]	Dec. 31, 2019
Bottom of range [Member]
Disclosure of quantitative information about right-of-use assets [line items]
Borrowings, interest rate	1.95%
Top of range [Member]
Disclosure of quantitative information about right-of-use assets [line items]
Borrowings, interest rate	5.13%

Long-term debt (Narrative) (Det

Long-term debt (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Senior unsecured notes [Member]
Disclosure of detailed information about borrowings [line items]
Face amount of debt instruments	$ 1,000,000
Senior Notes Due 2023 [Member]
Disclosure of detailed information about borrowings [line items]
Face amount of debt instruments	$ 400,000
Borrowings, interest rate	7.25%
Senior Notes Due 2025 [Member]
Disclosure of detailed information about borrowings [line items]
Face amount of debt instruments	$ 600,000
Borrowings, interest rate	7.625%
Senior secured revolving credit facilities [Member] | Peru [Member]
Disclosure of detailed information about borrowings [line items]
Surety bonds issued to support reclamation obligations	$ 40,000
Letters of credit issued to support reclamation or pension obligations	43,509
Letters Of Credit	45,000
Senior secured revolving credit facilities [Member] | Arizona [Member]
Disclosure of detailed information about borrowings [line items]
Surety bonds issued to support reclamation obligations	8,591
Senior secured revolving credit facilities [Member] | Manitoba [Member]
Disclosure of detailed information about borrowings [line items]
Letters of credit issued to support reclamation or pension obligations	$ 85,927

Deferred revenue (Narrative) (D

Deferred revenue (Narrative) (Details) $ in Thousands	15 Months Ended
	Nov. 04, 2013USD ($)
Disclosure of deferred revenue [abstract]
Deposits from customers	$ 885,000
Description of additional deposit payments	In addition to the deposit payments, as gold and silver is delivered to Wheaton, the Group receives cash payments equal to the lesser of (i) the market price and (ii) $400 per ounce (for gold) and $5.90 per ounce (for silver), subject to 1% annual escalation after three years, from the inception of the agreement.

Provisions (Narrative) (Details

Provisions (Narrative) (Details)	Dec. 31, 2019	Dec. 31, 2018
Bottom of range [member]
Disclosure of other provisions [line items]
Provision estimates, discount rate used	1.59%	1.80%
Top of range [Member]
Disclosure of other provisions [line items]
Provision estimates, discount rate used	2.39%	3.02%

Pension obligations (Narrative)

Pension obligations (Narrative) (Details) - Pension obligations [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)Year	Dec. 31, 2018USD ($)Year
Pension Obligations [Line Items]
Settlement payments from plan assets	$ (6,307)	$ (120,018)
Estimate of contributions expected to be paid to plan for next annual reporting period	$ 12,070
Weighted average duration of defined benefit obligation | Year	19.3	17.3
Return on plan assets, percentage	15.10%	(2.60%)
Active members [Member]
Pension Obligations [Line Items]
Weighted average duration of defined benefit obligation | Year	19.7	17.6
Deferred members [Member]
Pension Obligations [Line Items]
Weighted average duration of defined benefit obligation | Year	22	14
Retired members [Member]
Pension Obligations [Line Items]
Weighted average duration of defined benefit obligation | Year	10.5	10.4
Actuarial assumption of discount rates [Member]
Pension Obligations [Line Items]
Reasonably possible increase in actuarial assumption, basis points	50
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption	$ (21,290)
Reasonably possible decrease in actuarial assumption, basis points	50
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption	$ 24,435
Actuarial assumption of expected rates of salary increases [Member]
Pension Obligations [Line Items]
Percentage of reasonably possible increase in actuarial assumption	1.00%
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption	$ 3,476
Percentage of reasonably possible decrease in actuarial assumption	1.00%
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption	$ (3,125)
Actuarial assumptions of life expectancy [Member]
Pension Obligations [Line Items]
Reasonably possible increase in life expectancy (years) | Year	1
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption	$ 2,386
Reasonably possible decrease in life expectancy (years) | Year	1
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption	$ (2,446)

Other employee benefits (Narrat

Other employee benefits (Narrative) (Details) - Other employee benefits [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)Year	Dec. 31, 2018Year
Other Employee Benefits [Line Items]
Weighted average duration of non-pension post employment obligation | Year	19.6	18.6
Actuarial assumption of discount rates [Member]
Other Employee Benefits [Line Items]
Reasonably possible increase in actuarial assumption, basis points	50
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption	$ (10,259)
Reasonably possible decrease in actuarial assumption, basis points	50
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption	$ 11,831
Actuarial assumption of health care cost trend rates [Member]
Other Employee Benefits [Line Items]
Percentage of reasonably possible increase in actuarial assumption	1.00%
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption	$ 24,123
Percentage of reasonably possible decrease in actuarial assumption	1.00%
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption	$ (18,581)
Actuarial assumptions of life expectancy [Member]
Other Employee Benefits [Line Items]
Reasonably possible increase in life expectancy (years) | Year	1
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption	$ 4,556
Reasonably possible decrease in life expectancy (years) | Year	1
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption	$ (4,498)
Active members [Member]
Other Employee Benefits [Line Items]
Weighted average duration of non-pension post employment obligation | Year	24.9	23.7
Inactive members [Member]
Other Employee Benefits [Line Items]
Weighted average duration of non-pension post employment obligation | Year	13.9	13.4

Income and mining taxes (Narrat

Income and mining taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deductible temporary differences for which no deferred tax asset is recognised	$ 531,338	$ 569,254
Description of expiry date of deductible temporary differences, unused tax losses and unused tax credits	The Canadian non-capital losses were incurred between 2006 and 2019 and expire between 2026 and 2039. The Group incurred United Stated net operating losses between 2004 and 2019 which have a twenty year carry forward period. Peruvian net operating losses were incurred from 2014 to 2016 which have a four year carry forward period.
Mining tax effect of temporary differences recognized [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deductible temporary differences for which no deferred tax asset is recognised	$ 5,361	$ 8,469

Share capital (Narrative) (Deta

Share capital (Narrative) (Details) $ / shares in Units, $ in Thousands, $ in Thousands	1 Months Ended					12 Months Ended
	Feb. 20, 2020$ / shares	Sep. 27, 2019USD ($)	Mar. 29, 2019USD ($)	Sep. 28, 2018USD ($)	Mar. 29, 2018USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2019$ / shares	Dec. 31, 2018USD ($)	Mar. 27, 2020CAD ($)
Disclosure of classes of share capital [line items]
Dividends declared, amount per share | $ / shares							$ 0.01
Dividends paid | $		$ 1,972	$ 1,955	$ 2,019	$ 2,026	$ 3,927		$ 4,045
Dividends declared after reporting period [Member]
Disclosure of classes of share capital [line items]
Dividends declared, amount per share | $ / shares	$ 0.01
Dividends declared | $									$ 2,613

Share-based payments (Narrative

Share-based payments (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disclosure of terms and conditions of share-based payment arrangement [line items]
Liability related to deferred share unit plan	$ 3,876	$ 4,288
Liability related to restricted share unit plan	$ 5,477	$ 12,201
Restricted share units vested, but unreleased and unpaid	616,397	1,842,837
Stock option plan [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Description of stock option plan, number of options authorized	Under the amended Plan, the Group may grant to employees, officers, directors or consultants of the Group or its affiliates options to purchase up to a maximum of 13 million common shares of the Group. As of December 31, 2018, all options had either been exercised, or expired.
Maximum number of common shares purchaseable under stock option plan	13,000,000

Capital management (Narrative)

Capital management (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of objectives, policies and processes for managing capital [abstract]
Long-term debt	$ 985,255	$ 981,030
Cash and cash equivalents	$ 396,146	$ 515,497	$ 356,499

Financial instruments (Narrativ

Financial instruments (Narrative) (Details) $ in Thousands	Dec. 31, 2019USD ($)Tonne$ / lb	Dec. 31, 2018USD ($)Tonne$ / lb
Disclosure of risk management strategy related to hedge accounting [line items]
Tonnes of copper fixed for floating swaps | Tonne	30,000
Average price recorded for copper fixed for floating swaps | $ / lb	2.67
Tonnes of zinc forward sales contracts | Tonne	5,755	2,925
Derivative financial assets	$ 1,712	$ 6,628
Derivative financial liabilities	10,295	2,634
Aggregate fair value of other embedded derivatives	9,074	7,201
Prepayment option - embedded derivative	$ 2,585	$ 3,664
Deposits and other investments with Schedule 1 Canadian banks, as a percentage of total cash and cash equivalents	92.00%	74.00%
Percentage of entity's trade receivables that are insured	96.00%	95.00%
Credit insurance deductible	10.00%
Percentage of receivables that represent largest customers	63.00%	78.00%
Copper fixed for floating swaps [Member]
Disclosure of risk management strategy related to hedge accounting [line items]
Derivative financial assets		$ 4,171
Derivative financial liabilities	$ 8,362
Non-hedge derivative zinc contracts [Member]
Disclosure of risk management strategy related to hedge accounting [line items]
Derivative financial liabilities	$ 221	$ 177
Non-hedge derivative zinc contracts [Member] | Bottom of range [member]
Disclosure of risk management strategy related to hedge accounting [line items]
Range of zinc forward sales contracts prices | $ / lb	1	1.09
Non-hedge derivative zinc contracts [Member] | Top of range [Member]
Disclosure of risk management strategy related to hedge accounting [line items]
Range of zinc forward sales contracts prices | $ / lb	1.15	1.45
Provisional pricing - copper and zinc [Member]
Disclosure of risk management strategy related to hedge accounting [line items]
Derivative financial assets	$ 10,165
Derivative financial liabilities		$ 6,351
Pampacancha Delivery Obligation [Member]
Disclosure of risk management strategy related to hedge accounting [line items]
Aggregate fair value of other embedded derivatives	$ 9,074	$ 7,201

Commitments and contingencies_2

Commitments and contingencies (Narrative) (Details) $ in Thousands	Dec. 31, 2019USD ($)
Canada [Member]
Disclosure of contingent liabilities [line items]
Capital commitments	$ 3,681
Canada [Member] | Amounts which can be terminated [Member]
Disclosure of contingent liabilities [line items]
Capital commitments	1,897
Peru [Member]
Disclosure of contingent liabilities [line items]
Capital commitments	34,617
Rosemont project in Arizona [Member]
Disclosure of contingent liabilities [line items]
Capital commitments	180,440
Rosemont project in Arizona [Member] | Amounts which can be terminated [Member]
Disclosure of contingent liabilities [line items]
Capital commitments	$ 89,370

Supplementary cash flow infor_3

Supplementary cash flow information (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Apr. 25, 2019
Supplementary Cash Flow Information [Line Items]
Increase to property, plant and equipment assets due to remeasurements of decommissioning and restoration liabilities	$ 89,408	$ 8,998
Agreement with United Copper & Moly LLC ("UCM") [Member] | Rosemont Project [Member]
Supplementary Cash Flow Information [Line Items]
Loan receivable balance written off			$ 25,978
Cost [Member]
Supplementary Cash Flow Information [Line Items]
Increase to property, plant and equipment assets due to remeasurements of decommissioning and restoration liabilities	89,408	8,998
Additions	181,855	115,559
Plant and equipment- ROU assets [Member] | Cost [Member]
Supplementary Cash Flow Information [Line Items]
Additions	$ 22,158	$ 0

Segmented information (Narrativ

Segmented information (Narrative) (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Customer 1 [Member]
Disclosure of operating segments [line items]
Percentage of entity's revenue	24.00%	26.00%
Customer 2 [Member]
Disclosure of operating segments [line items]
Percentage of entity's revenue	9.00%	9.00%
Customer 3 [Member]
Disclosure of operating segments [line items]
Percentage of entity's revenue	9.00%	8.00%
Customer 4 [Member]
Disclosure of operating segments [line items]
Percentage of entity's revenue	8.00%	7.00%
Customer 5 [Member]
Disclosure of operating segments [line items]
Percentage of entity's revenue	5.00%	5.00%
Customer 6 [Member]
Disclosure of operating segments [line items]
Percentage of entity's revenue	5.00%	5.00%

Significant accounting polici_3

Significant accounting policies (Schedule of detailed information about estimated useful life or depreciation rate explanatory) (Details)	12 Months Ended
	Dec. 31, 2019
Equipment [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Useful lives or depreciation rates, property, plant and equipment	straight-line over 1 to 20 years
Other plant assets [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Useful lives or depreciation rates, property, plant and equipment	straight-line over 1 to 20 years / unit-of-production
ROU Assets [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Useful lives or depreciation rates, property, plant and equipment	straight-line over 1 to 23 years

New standards (Schedule of new

New standards (Schedule of new standards adopted, impact summary consolidated balance sheet) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Disclosure of changes in accounting estimates [line items]
Property, plant & equipment, carrying value	$ 3,662,559	$ 3,819,812
Lease Liability (current)	32,781	20,472
Lease Liability (non-current)	$ 49,166	53,763
Adjustment [Member]
Disclosure of changes in accounting estimates [line items]
Property, plant & equipment, carrying value		14,980
Lease Liability (current)		4,949
Lease Liability (non-current)		10,031
Revised opening balance after adjustment [Member]
Disclosure of changes in accounting estimates [line items]
Property, plant & equipment, carrying value		3,834,792
Lease Liability (current)		25,421
Lease Liability (non-current)		$ 63,794

New standards (Schedule of ne_2

New standards (Schedule of new standards adopted, change in opening lease liability balances) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2019
Disclosure of changes in accounting estimates [line items]
Total minimum lease payments - lease liabilities	$ 78,174	$ 88,096
Newly capitalized leases, IFRS 16	17,708
Effect of discounting	(3,939)	(6,149)
Present value of minimum lease payments	74,235	81,947
Less: current portion	(20,472)	(32,781)
Minimum finance lease payments payable noncurrent	53,763	$ 49,166
Revised opening balance after adjustment [Member]
Disclosure of changes in accounting estimates [line items]
Total minimum lease payments - lease liabilities	95,882
Effect of discounting	(6,667)
Present value of minimum lease payments	89,215
Less: current portion	(25,421)
Minimum finance lease payments payable noncurrent	$ 63,794

New standards (Schedule of ne_3

New standards (Schedule of new standards adopted, reconciliation of operating leases in IAS 17 to IFRS 16) (Details) $ in Thousands	Dec. 31, 2018USD ($)
Disclosure of changes in accounting estimates [abstract]
Operating lease commitments	$ 63,448
Less: short term leases - expedient	(3,663)
Less: low value leases - expedient	(10)
Less: variable consideration leases	(46,120)
Add: inclusion of non - lease components (election) and expected term extensions	4,053
Lease commitments - capitalizable leases	17,708
Effect of discounting	(2,728)
Newly capitalized leases	$ 14,980

Acquisition of remaining inte_4

Acquisition of remaining interest in the Rosemont project (Schedule of detailed information about consideration paid) (Details) - Agreement with United Copper & Moly LLC ("UCM") [Member] - Rosemont Project [Member] $ in Thousands	Apr. 25, 2019USD ($)
Disclosure of detailed information about business combination [line items]
Cash	$ 45,000
Present value of future cash installments	23,557
Total consideration	$ 68,557

Acquisition of remaining inte_5

Acquisition of remaining interest in the Rosemont project (Schedule of detailed information about assets acquired and liabilities assumed) (Details) - Agreement with United Copper & Moly LLC ("UCM") [Member] - Rosemont Project [Member] $ in Thousands	Apr. 25, 2019USD ($)
Disclosure of detailed information about business combination [line items]
Current assets	$ 343
Non-current assets	68,904
Liabilities	(690)
Net assets acquired	$ 68,557

Revenue and expenses (Schedule

Revenue and expenses (Schedule of detailed information about revenue) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Analysis of income and expense [abstract]
Copper	$ 786,332	$ 963,063
Zinc	284,897	357,396
Gold	152,394	149,043
Silver	89,685	85,808
Molybdenum	31,270	20,995
Other	4,760	4,726
Revenue from sale of goods	1,349,338	1,581,031
Variable consideration adjustment	(16,295)	(2,655)
Pricing and volume adjustments	(12,123)	(4,101)
Revenue excluding treatment and refining charges	1,320,920	1,574,275
Treatment and refining charges	(83,481)	(101,909)
Revenue	$ 1,237,439	$ 1,472,366

Revenue and expenses (Schedul_2

Revenue and expenses (Schedule of depreciation and amortization expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Revenue And Expenses [Line Items]
Depreciation and amortization	$ 346,634	$ 333,144
Cost of sales [Member]
Revenue And Expenses [Line Items]
Depreciation and amortization	344,555	332,667
Selling and administrative expenses [Member]
Revenue And Expenses [Line Items]
Depreciation and amortization	$ 2,079	$ 477

Revenue and expenses (Schedul_3

Revenue and expenses (Schedule of detailed information about share-based expense (recoveries)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Revenue And Expenses [Line Items]
Share-based expenses (recoveries)	$ 2,714	$ (2,373)
Cost of sales [Member]
Revenue And Expenses [Line Items]
Share-based expenses (recoveries)	400	160
Selling and administrative expenses [Member]
Revenue And Expenses [Line Items]
Share-based expenses (recoveries)	2,085	(2,579)
Other operating [Member]
Revenue And Expenses [Line Items]
Share-based expenses (recoveries)	229	46
RSUs [Member]
Revenue And Expenses [Line Items]
Share-based expenses (recoveries)	1,557	(496)
RSUs [Member] | Cost of sales [Member]
Revenue And Expenses [Line Items]
Share-based expenses (recoveries)	400	160
RSUs [Member] | Selling and administrative expenses [Member]
Revenue And Expenses [Line Items]
Share-based expenses (recoveries)	928	(702)
RSUs [Member] | Other operating [Member]
Revenue And Expenses [Line Items]
Share-based expenses (recoveries)	229	46
DSUs [Member]
Revenue And Expenses [Line Items]
Share-based expenses (recoveries)	1,157	(1,877)
DSUs [Member] | Cost of sales [Member]
Revenue And Expenses [Line Items]
Share-based expenses (recoveries)	0	0
DSUs [Member] | Selling and administrative expenses [Member]
Revenue And Expenses [Line Items]
Share-based expenses (recoveries)	1,157	(1,877)
DSUs [Member] | Other operating [Member]
Revenue And Expenses [Line Items]
Share-based expenses (recoveries)	$ 0	$ 0

Revenue and expenses (Schedul_4

Revenue and expenses (Schedule of other operating expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Revenue And Expenses [Line Items]
Other operating expenses (income)	$ 51,116	$ 19,071
Write down of UCM receivable [Member]
Revenue And Expenses [Line Items]
Other operating expenses (income)	25,978	0
Regional costs [Member]
Revenue And Expenses [Line Items]
Other operating expenses (income)	3,780	4,673
Pampacancha delivery obligation [Member]
Revenue And Expenses [Line Items]
Other operating expenses (income)	7,499	7,218
Pension settlement loss [Member]
Revenue And Expenses [Line Items]
Other operating expenses (income)	96	2,163
Loss on disposal of property,plant & equipment [Member]
Revenue And Expenses [Line Items]
Other operating expenses (income)	4,807	7,189
Closure cost adjustment [Member]
Revenue And Expenses [Line Items]
Other operating expenses (income)	2,289	(425)
Allocation of community costs [Member]
Revenue And Expenses [Line Items]
Other operating expenses (income)	2,216	0
Other [Member]
Revenue And Expenses [Line Items]
Other operating expenses (income)	$ 4,451	$ (1,747)

Revenue and expenses (Schedul_5

Revenue and expenses (Schedule of detailed information about impairment) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Statements [Line Items]
Property, plant & equipment	$ 322,249
Arizona [Member]
Statements [Line Items]
Property, plant & equipment	322,249
Tax impact - (recovery)	(80,143)
After-tax impairment charge	$ 242,106

Revenue and expenses (Schedul_6

Revenue and expenses (Schedule of detailed information about employee benefits expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Revenue And Expenses [Line Items]
Current employee benefits	$ 169,663	$ 176,571
Profit-sharing plan expense	1,510	9,228
Share-based payments	2,714	(2,373)
Employee share purchase plan	1,645	1,533
Defined benefit plans	10,643	12,295
Defined contribution plans	1,635	1,511
Past service costs		383
Other post-retirement employee benefits	8,457	9,248
Termination benefits	628	1,206
Employee benefits expense	196,895	209,602
Restricted Share Unit [Member]
Revenue And Expenses [Line Items]
Share-based payments	1,557	(496)
Deferred Share Unit [Member]
Revenue And Expenses [Line Items]
Share-based payments	$ 1,157	$ (1,877)

Revenue and expenses (Schedul_7

Revenue and expenses (Schedule of Finance income and expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Analysis of income and expense [abstract]
Finance income	$ (8,527)	$ (8,450)
Interest expense on long-term debt	78,265	77,783
Accretion on financial liabilities at amortized cost	1,222	1,244
Finance costs on deferred revenue	69,772	64,921
Unwinding of discounts on provisions	4,392	4,684
Withholding taxes	8,100	9,424
Other finance expense	11,027	7,116
Gross finance expense	172,778	165,172
Interest capitalized	(9,890)	(13,172)
Total Finance expense	162,888	152,000
Net foreign exchange losses (gains)	(1,388)	11,067
Hudbay warrants		(6,748)
Embedded derivatives	3,708	(1,514)
Investments	4,539	3,798
Total other finance (gains) losses	9,635	(15,531)
Net finance expense	$ 163,996	$ 128,019

Cash and cash equivalents (Sche

Cash and cash equivalents (Schedule of detailed information about cash and cash equivalents) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash and cash equivalents [abstract]
Cash on hand and demand deposits	$ 396,146	$ 515,497
Short-term money market instruments with maturities of three months or less at acquisition date	0	0
Cash and cash equivalents	$ 396,146	$ 515,497	$ 356,499

Trade and other receivables (Sc

Trade and other receivables (Schedule of detailed information about trade and other receivables explanatory) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current
Trade receivables	$ 87,332	$ 102,112
Statutory receivables	16,543	12,764
Other receivables	2,119	2,277
Total current trade and other receivables	105,994	117,153
Non-current
Taxes receivable	17,669	17,199
Receivable from joint venture partners	0	20,404
Other receivables	1,595	1,518
Trade and other non-current receivables	19,264	39,121
Trade and other receivables	$ 125,258	$ 156,274

Inventories (Schedule of detail

Inventories (Schedule of detailed information about inventories) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current
Stockpile	$ 10,396	$ 5,463
Work in progress	14,420	1,762
Finished goods	62,230	62,546
Materials and supplies	51,774	48,703
Current inventories	138,820	118,474
Non-current
Stockpile	14,626	14,730
Materials and supplies	4,829	4,746
Non current inventories	19,455	19,476
Total inventories	$ 158,275	$ 137,950

Other financial assets (Schedul

Other financial assets (Schedule of other financial assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current
Derivative assets	$ 1,712	$ 6,628
Restricted cash	337	3,738
Other current financial assets	2,049	10,366
Non-current
Investments at fair value through profit or loss	11,287	15,159
Total other financial assets	$ 13,336	$ 25,525

Intangibles and other assets (S

Intangibles and other assets (Schedule of detailed information about intangible assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disclosure of reconciliation of changes in goodwill [line items]
Balance, beginning of year	$ 4,162
Balance, end of year	5,027	$ 4,162
Cost [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Balance, beginning of year	18,557	19,169
Additions	2,325	590
Disposals	(96)	0
Effects of movement in exchange rates	752	(1,202)
Balance, end of year	21,538	18,557
Accumulated amortization [Member]
Disclosure of reconciliation of changes in goodwill [line items]
Balance, beginning of year	14,395	13,594
Additions	1,606	1,793
Disposals	(96)	0
Effects of movement in exchange rates	606	(992)
Balance, end of year	$ 16,511	$ 14,395

Property, plant and equipment_3

Property, plant and equipment (Schedule of detailed information about property, plant and equipment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [line items]
Balance, beginning of year	$ 3,819,812
Decommissioning and restoration	89,408	$ 8,998
Interest capitalised	9,890	13,172
Impairment	(322,249)
Balance, end of year	3,662,559	3,819,812
Increase (decrease) due to application of IFRS 16 [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance, beginning of year	14,980
Balance, end of year		14,980
Revised opening balance after adjustment [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance, beginning of year	3,834,792
Balance, end of year		3,834,792
Cost [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance, beginning of year	5,562,773	5,467,621
Additions	181,855	115,559
Acquisitions	94,862	21,654
Capitalized stripping and development	103,108	84,023
Decommissioning and restoration	89,408	8,998
Interest capitalised	9,890	13,172
Transfers and other movements	0	0
Impairment	(322,249)
Disposals	(14,309)	(14,991)
Pre-production revenue		(133,261)
Effects of movement in exchange rates	83,534
Other	2,232	(2)
Balance, end of year	5,806,084	5,562,773
Cost [Member] | Increase (decrease) due to application of IFRS 16 [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Increase (decrease) due to adoption of new accounting standard		14,980
Cost [Member] | Revised opening balance after adjustment [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance, beginning of year	5,577,753
Balance, end of year		5,577,753
Accumulated depreciation [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance, beginning of year	1,742,961	1,503,388
Depreciation for the year	353,882	330,572
Disposals	(6,675)	(6,780)
Effects of movement in exchange rates	53,357	(83,680)
Other		(539)
Balance, end of year	2,143,525	1,742,961
Accumulated depreciation [Member] | Increase (decrease) due to application of IFRS 16 [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Increase (decrease) due to adoption of new accounting standard		0
Accumulated depreciation [Member] | Revised opening balance after adjustment [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance, beginning of year	1,742,961
Balance, end of year		1,742,961
Exploration and evaluation assets [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance, beginning of year	52,206
Balance, end of year	69,903	52,206
Exploration and evaluation assets [Member] | Revised opening balance after adjustment [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance, beginning of year	52,206
Balance, end of year		52,206
Exploration and evaluation assets [Member] | Cost [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance, beginning of year	52,206	23,010
Additions	17,016	9,950
Acquisitions	0	21,654
Capitalized stripping and development	0	0
Decommissioning and restoration	0	0
Interest capitalised	0	0
Transfers and other movements	0	0
Impairment	0
Disposals	0	(1,208)
Pre-production revenue		(1,197)
Effects of movement in exchange rates	681
Other	0	(3)
Balance, end of year	69,903	52,206
Exploration and evaluation assets [Member] | Cost [Member] | Increase (decrease) due to application of IFRS 16 [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Increase (decrease) due to adoption of new accounting standard		0
Exploration and evaluation assets [Member] | Cost [Member] | Revised opening balance after adjustment [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance, beginning of year	52,206
Balance, end of year		52,206
Exploration and evaluation assets [Member] | Accumulated depreciation [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance, beginning of year	0	0
Depreciation for the year	0	0
Disposals	0	0
Effects of movement in exchange rates	0	0
Other		0
Balance, end of year	0	0
Exploration and evaluation assets [Member] | Accumulated depreciation [Member] | Increase (decrease) due to application of IFRS 16 [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Increase (decrease) due to adoption of new accounting standard		0
Exploration and evaluation assets [Member] | Accumulated depreciation [Member] | Revised opening balance after adjustment [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance, beginning of year	0
Balance, end of year		0
Capital works in progress [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance, beginning of year	873,781
Balance, end of year	733,874	873,781
Capital works in progress [Member] | Revised opening balance after adjustment [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance, beginning of year	873,781
Balance, end of year		873,781
Capital works in progress [Member] | Cost [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance, beginning of year	873,781	933,531
Additions	109,372	88,920
Acquisitions	91,332	0
Capitalized stripping and development	0	0
Decommissioning and restoration	41	15
Interest capitalised	9,890	13,172
Transfers and other movements	(30,000)	(152,781)
Impairment	(322,249)
Disposals	(2,029)	(4,034)
Pre-production revenue		(3,873)
Effects of movement in exchange rates	1,528
Other	2,208	(1,169)
Balance, end of year	733,874	873,781
Capital works in progress [Member] | Cost [Member] | Increase (decrease) due to application of IFRS 16 [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Increase (decrease) due to adoption of new accounting standard		0
Capital works in progress [Member] | Cost [Member] | Revised opening balance after adjustment [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance, beginning of year	873,781
Balance, end of year		873,781
Capital works in progress [Member] | Accumulated depreciation [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance, beginning of year	0	0
Depreciation for the year	0	0
Disposals	0	0
Effects of movement in exchange rates	0	0
Other		0
Balance, end of year	0	0
Capital works in progress [Member] | Accumulated depreciation [Member] | Increase (decrease) due to application of IFRS 16 [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Increase (decrease) due to adoption of new accounting standard		0
Capital works in progress [Member] | Accumulated depreciation [Member] | Revised opening balance after adjustment [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance, beginning of year	0
Balance, end of year		0
Mining properties [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance, beginning of year	1,217,685
Balance, end of year	1,183,053	1,217,685
Mining properties [Member] | Revised opening balance after adjustment [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance, beginning of year	1,217,685
Balance, end of year		1,217,685
Mining properties [Member] | Cost [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance, beginning of year	1,998,439	1,975,061
Additions	0	0
Acquisitions	3,157	0
Capitalized stripping and development	103,108	84,023
Decommissioning and restoration	3,314	1,711
Interest capitalised	0	0
Transfers and other movements	642	2,132
Impairment	0
Disposals	0	0
Pre-production revenue		(65,434)
Effects of movement in exchange rates	41,080
Other	(3,157)	946
Balance, end of year	2,146,583	1,998,439
Mining properties [Member] | Cost [Member] | Increase (decrease) due to application of IFRS 16 [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Increase (decrease) due to adoption of new accounting standard		0
Mining properties [Member] | Cost [Member] | Revised opening balance after adjustment [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance, beginning of year	1,998,439
Balance, end of year		1,998,439
Mining properties [Member] | Accumulated depreciation [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance, beginning of year	780,754	683,183
Depreciation for the year	154,970	141,218
Disposals	0	0
Effects of movement in exchange rates	27,806	(43,469)
Other		(178)
Balance, end of year	963,530	780,754
Mining properties [Member] | Accumulated depreciation [Member] | Increase (decrease) due to application of IFRS 16 [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Increase (decrease) due to adoption of new accounting standard		0
Mining properties [Member] | Accumulated depreciation [Member] | Revised opening balance after adjustment [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance, beginning of year	780,754
Balance, end of year		780,754
Plant and equipment [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance, beginning of year	1,676,140
Balance, end of year	1,584,065	1,676,140
Plant and equipment [Member] | Revised opening balance after adjustment [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance, beginning of year	1,600,846
Balance, end of year		1,600,846
Plant and equipment [Member] | Cost [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance, beginning of year	2,638,347	2,536,019
Additions	33,309	16,689
Acquisitions	0	0
Capitalized stripping and development	0	0
Decommissioning and restoration	86,053	7,272
Interest capitalised	0	0
Transfers and other movements	30,406	150,649
Impairment	0
Disposals	(10,747)	(9,749)
Pre-production revenue		(62,757)
Effects of movement in exchange rates	38,452
Other	3,103	224
Balance, end of year	2,653,752	2,638,347
Plant and equipment [Member] | Cost [Member] | Increase (decrease) due to application of IFRS 16 [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Increase (decrease) due to adoption of new accounting standard		(165,171)
Plant and equipment [Member] | Cost [Member] | Revised opening balance after adjustment [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance, beginning of year	2,473,176
Balance, end of year		2,473,176
Plant and equipment [Member] | Accumulated depreciation [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance, beginning of year	962,207	820,205
Depreciation for the year	179,062	189,354
Disposals	(6,675)	(6,780)
Effects of movement in exchange rates	24,970	(40,211)
Other		(361)
Balance, end of year	1,069,687	962,207
Plant and equipment [Member] | Accumulated depreciation [Member] | Increase (decrease) due to application of IFRS 16 [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Increase (decrease) due to adoption of new accounting standard		(89,877)
Plant and equipment [Member] | Accumulated depreciation [Member] | Revised opening balance after adjustment [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance, beginning of year	872,330
Balance, end of year		872,330
Plant and equipment- ROU assets [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance, beginning of year	0
Balance, end of year	91,664	0
Plant and equipment- ROU assets [Member] | Revised opening balance after adjustment [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance, beginning of year	90,274
Balance, end of year		90,274
Plant and equipment- ROU assets [Member] | Cost [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance, beginning of year	0	0
Additions	22,158	0
Acquisitions	373	0
Capitalized stripping and development	0	0
Interest capitalised	0	0
Transfers and other movements	(1,048)	0
Impairment	0
Disposals	(1,533)	0
Pre-production revenue		0
Effects of movement in exchange rates	1,793
Other	78	0
Balance, end of year	201,972	0
Plant and equipment- ROU assets [Member] | Cost [Member] | Increase (decrease) due to application of IFRS 16 [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Increase (decrease) due to adoption of new accounting standard		180,151
Plant and equipment- ROU assets [Member] | Cost [Member] | Revised opening balance after adjustment [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance, beginning of year	180,151
Balance, end of year		180,151
Plant and equipment- ROU assets [Member] | Accumulated depreciation [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance, beginning of year	89,877	0
Depreciation for the year	19,850	0
Disposals	0	0
Effects of movement in exchange rates	581	0
Other		0
Balance, end of year	110,308	89,877
Plant and equipment- ROU assets [Member] | Accumulated depreciation [Member] | Increase (decrease) due to application of IFRS 16 [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Increase (decrease) due to adoption of new accounting standard		89,877
Plant and equipment- ROU assets [Member] | Accumulated depreciation [Member] | Revised opening balance after adjustment [Member]
Disclosure of detailed information about property, plant and equipment [line items]
Balance, beginning of year	$ 89,877
Balance, end of year		$ 89,877

Property, plant and equipment_4

Property, plant and equipment (Schedule of changes in key assumptions) (Details) - Cash-generating units [Member] - Arizona [Member] $ in Thousands	9 Months Ended
	Sep. 30, 2019USD ($)
Disclosure of detailed information about property, plant and equipment [line items]
Decrease in FVLCD on decrease in average LOM copper price	$ 308,148
Decrease in FVLCD on increase in real discount rate	135,733
Decrease in FVLCD on one year additional delay in the start of project construction	$ 76,921
Decrease in average LOM copper price	10.00%
Increase in real discount rate, number of percentage points	1

Trade and other payables (Sched

Trade and other payables (Schedule of detailed information about trade and other payables) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Trade and other payables [abstract]
Trade payables	$ 68,742	$ 61,395
Accruals and payables	80,375	68,386
Accrued interest	34,603	34,662
Exploration and evaluation payables	884	185
Statutory payables	7,800	7,324
Trade and other payables	$ 192,404	$ 171,952

Other liabilities (Schedule of

Other liabilities (Schedule of other current liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Miscellaneous current liabilities [abstract]
Provisions	$ 33,575	$ 14,276
Pension liability	12,015	11,854
Other employee benefits	2,806	2,564
Unearned revenue	1,015	1,857
Other liabilities	$ 49,411	$ 30,551

Other financial liabilities (Sc

Other financial liabilities (Schedule of detailed information about other financial liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current
Derivative liabilities	$ 10,295	$ 2,634
Other financial liabilities at amortized cost	8,707	2,590
Embedded derivatives	9,074	7,201
Other current financial liabilities	28,076	12,425
Non-current
Deferred Rosemont acquisition consideration	24,491	0
Other financial liabilities at amortized cost	15,293	18,771
Other non-current financial liabilities	39,784	18,771
Other financial liabilities	$ 67,860	$ 31,196

Lease Liability (Schedule of ad

Lease Liability (Schedule of additional information about leasing activities for lessee) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Disclosure of quantitative information about right-of-use assets [line items]
Total minimum lease payments	$ 88,096	$ 78,174
Effect of discounting	(6,149)	(3,939)
Present value of minimum lease payments	81,947	74,235
Less: current portion	(32,781)	(20,472)
Minimum finance lease payments payable noncurrent	49,166	53,763
Less than 12 months [Member]
Disclosure of quantitative information about right-of-use assets [line items]
Total minimum lease payments	27,557	18,448
13-36 months [Member]
Disclosure of quantitative information about right-of-use assets [line items]
Total minimum lease payments	48,503	40,615
37-60 months [Member]
Disclosure of quantitative information about right-of-use assets [line items]
Total minimum lease payments	7,798	19,111
More than 60 months [Member]
Disclosure of quantitative information about right-of-use assets [line items]
Total minimum lease payments	$ 4,238	$ 0

Lease Liability (Schedule of ex

Lease Liability (Schedule of expenses recognized to leases for which exemption applied) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Lease liabilities [abstract]
Short-term leases	$ 45,745
Low value leases	92
Variable leases	56,152
Total	$ 101,989

Long-term debt (Schedule of bor

Long-term debt (Schedule of borrowings) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about borrowings [line items]
Long-term debt	$ 985,255	$ 981,030
Senior unsecured notes [Member]
Disclosure of detailed information about borrowings [line items]
Long-term debt	991,558	989,306	$ 987,903
Unamortized transaction costs - revolving credit facilities [Member]
Disclosure of detailed information about borrowings [line items]
Less: Unamortized transaction costs - revolving credit facilities	$ (6,303)	$ (8,276)	$ (8,328)

Long-term debt (Schedule of det

Long-term debt (Schedule of detailed information about borrowings) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disclosure of detailed information about borrowings [line items]
Borrowings, beginning balance	$ 981,030
Borrowings, ending balance	985,255	$ 981,030
Senior unsecured notes [Member]
Disclosure of detailed information about borrowings [line items]
Borrowings, beginning balance	989,306	987,903
Change in fair value of embedded derivative (prepayment option)	1,079	316
Accretion of transaction costs and premiums	1,173	1,087
Borrowings, ending balance	$ 991,558	$ 989,306

Long-term debt (Schedule of d_2

Long-term debt (Schedule of detailed information about unamortized transaction costs - revolving credit facilities) (Details) - Unamortized transaction costs - revolving credit facilities [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disclosure of detailed information about borrowings [line items]
Unamortized transaction costs, beginning balance	$ 8,276	$ 8,328
Accretion of transaction costs	(2,342)	(1,946)
New transaction costs	(369)	(1,894)
Unamortized transaction costs, ending balance	$ 6,303	$ 8,276

Deferred revenue (Schedule of c

Deferred revenue (Schedule of changes in deferred revenue) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disclosure of deferred revenue [abstract]
Stream accounting - Deferred revenue, beginning balance	$ 566,078	$ 601,930
Amortization of deferred revenue
Liability drawdown	(92,398)	(96,038)
Variable consideration adjustment	16,295	2,655
Finance costs		64,921
Finance costs
Current year additions	63,725
Variable consideration adjustment	6,047
Effects of changes in foreign exchange	4,009	(7,390)
Stream accounting - Deferred revenue, ending balance	$ 563,756	$ 566,078

Deferred revenue (Schedule of d

Deferred revenue (Schedule of detailed information about deferred revenue) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of deferred revenue [abstract]
Current	$ 86,933	$ 86,256
Non-current	476,823	479,822
Deferred revenue	$ 563,756	$ 566,078	$ 601,930

Provisions (Schedule of changes

Provisions (Schedule of changes in provisions) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disclosure of other provisions [line items]
Provisions, beginning balance	$ 218,924	$ 227,508
Net additional provisions made	76,127	17,497
Amounts used	(15,525)	(7,393)
Unwinding of discount	4,392	4,684
Effect of change in discount rate	23,635	(462)
Effect of foreign exchange	7,648	(12,587)
Effect of change in share price	(776)	(10,323)
Provisions, ending balance	314,425	218,924
Decommissioning, restoration and similar liabilities [Member]
Disclosure of other provisions [line items]
Provisions, beginning balance	202,024	200,041
Net additional provisions made	68,881	9,031
Amounts used	(4,136)	(188)
Unwinding of discount	4,392	4,684
Effect of change in discount rate	23,635	(462)
Effect of foreign exchange	7,320	(11,082)
Effect of change in share price	0	0
Provisions, ending balance	302,116	202,024
Deferred share units [Member]
Disclosure of other provisions [line items]
Provisions, beginning balance	4,288	6,623
Net additional provisions made	1,479	973
Amounts used	(1,668)	0
Unwinding of discount	0	0
Effect of change in discount rate	0	0
Effect of foreign exchange	99	(458)
Effect of change in share price	(322)	(2,850)
Provisions, ending balance	3,876	4,288
Restricted share units [Member]
Disclosure of other provisions [line items]
Provisions, beginning balance	12,201	19,409
Net additional provisions made	2,885	7,493
Amounts used	(9,380)	(6,435)
Unwinding of discount	0	0
Effect of change in discount rate	0	0
Effect of foreign exchange	225	(973)
Effect of change in share price	(454)	(7,293)
Provisions, ending balance	5,477	12,201
Other [Member]
Disclosure of other provisions [line items]
Provisions, beginning balance	411	1,435
Net additional provisions made	2,882	0
Amounts used	(341)	(770)
Unwinding of discount	0	0
Effect of change in discount rate	0	0
Effect of foreign exchange	4	(74)
Effect of change in share price	0	(180)
Provisions, ending balance	$ 2,956	$ 411

Provisions (Schedule of detaile

Provisions (Schedule of detailed information about provisions) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of other provisions [line items]
Current	$ 33,575	$ 14,276
Non-current	280,850	204,648
Total provisions	314,425	218,924	$ 227,508
Decommissioning, restoration and similar liabilities [Member]
Disclosure of other provisions [line items]
Current	23,621	1,234
Non-current	278,495	200,790
Total provisions	302,116	202,024	200,041
Deferred share units [Member]
Disclosure of other provisions [line items]
Current	3,876	4,288
Non-current	0	0
Total provisions	3,876	4,288	6,623
Restricted share units [Member]
Disclosure of other provisions [line items]
Current	4,468	8,412
Non-current	1,009	3,789
Total provisions	5,477	12,201	19,409
Other [Member]
Disclosure of other provisions [line items]
Current	1,610	342
Non-current	1,346	69
Total provisions	$ 2,956	$ 411	$ 1,435

Pension obligations (Schedule o

Pension obligations (Schedule of additional information about defined benefit plans) - (Details) - Pension obligations [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Pension Obligations [Line Items]
Opening defined benefit obligation	$ 211,512	$ 383,054
Current service cost	9,880	11,032
Past service cost related to the new collective bargaining agreement	0	383
Interest cost	7,156	12,009
Benefits paid from plan	(16,745)	(29,499)
Benefits paid from employer	(934)	(1,998)
Participant contributions	64	98
Effects of movements in exchange rates	10,814	(32,015)
Arising from changes in demographic assumptions	0	0
Arising from changes in financial assumptions	30,455	(11,585)
Arising from experience adjustments	(2,258)	(2,112)
Settlement payments from plan assets	(6,307)	(120,018)
Loss on settlement	96	2,163
Closing defined benefit obligation	$ 243,733	$ 211,512

Pension obligations (Schedule_2

Pension obligations (Schedule of additional information about defined benefit plans, balance by member group) - (Details) - Pension obligations [Member] - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Pension Obligations [Line Items]
Closing defined benefit obligation	$ 243,733	$ 211,512	$ 383,054
Active members [Member]
Pension Obligations [Line Items]
Closing defined benefit obligation	231,959	200,591
Deferred members [Member]
Pension Obligations [Line Items]
Closing defined benefit obligation	1,555	723
Retired members [Member]
Pension Obligations [Line Items]
Closing defined benefit obligation	$ 10,219	$ 10,198

Pension obligations (Schedule_3

Pension obligations (Schedule of changes in fair value of plan assets) - (Details) - Pension obligations [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Pension Obligations [Line Items]
Opening fair value of plan assets	$ 175,795	$ 341,432
Interest income	6,170	11,033
Return on plan assets (excluding amounts included in net interest expense)	21,460	(15,296)
Contributions from the employer	11,952	17,020
Employer direct benefit payments	934	1,998
Contributions from plan participants	64	98
Benefit payment from employer	(934)	(1,998)
Administrative expenses paid from plan assets	(82)	(83)
Benefits paid	(16,745)	(29,499)
Settlement payments from plan assets	(6,307)	(120,018)
Effects of changes in foreign exchange rates	9,812	(28,892)
Closing fair value of plan assets	$ 202,119	$ 175,795

Pension obligations (Schedule_4

Pension obligations (Schedule of net defined benefit liability (asset)) - (Details) - Pension obligations [Member] - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Pension Obligations [Line Items]
Present value of funded defined benefit obligation	$ 224,364	$ 195,283
Fair value of plan assets	(202,119)	(175,795)	$ (341,432)
Present value of unfunded defined benefit obligation	19,369	16,229
Net liability arising from defined benefit obligation	$ 41,614	$ 35,717

Pension obligations (Schedule_5

Pension obligations (Schedule of detailed information about pension obligation) - (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Pension obligations [Member]
Pension Obligations [Line Items]
Pension obligation - current	$ 12,015	$ 11,854
Pension obligation - non-current	29,599	23,863
Net liability	41,614	35,717
Pension obligation - non-current	$ 29,599	$ 23,863

Pension obligations (Schedule_6

Pension obligations (Schedule of detailed information about pension expense) - (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Pension Obligations [Line Items]
Defined benefit pension expense	$ 10,643	$ 12,295
Defined contribution pension expense	1,635	1,511
Pension obligations [Member]
Pension Obligations [Line Items]
Current service cost	9,880	11,032
Past service cost and loss from settlements	0	383
Loss on settlement	96	2,163
Total service cost	9,976	13,578
Net interest expense	986	976
Administration cost	82	83
Defined benefit pension expense	11,044	14,637
Defined contribution pension expense	$ 1,639	$ 1,469

Pension obligations (Schedule_7

Pension obligations (Schedule of detailed information about remeasurement on net defined benefit liability) - (Details) - Pension obligations [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Pension Obligations [Line Items]
(Return)/loss on plan assets (excluding amounts included in net interest expense)	$ (21,460)	$ 15,296
Actuarial gains arising from changes in demographic assumptions	0	0
Actuarial losses/(gains) arising from changes in financial assumptions	29,609	(11,585)
Actuarial gains arising from experience adjustments	(2,258)	(2,112)
Defined benefit loss/(gain) related to remeasurement	5,891	1,599
Total pension cost	$ 18,574	$ 17,705

Pension obligations (Schedule_8

Pension obligations (Schedule of defined benefit plan, assumptions used) - (Details) - Pension obligations [Member] - Year	Dec. 31, 2019	Dec. 31, 2018
Defined benefit cost [Member]
Pension Obligations [Line Items]
Expected rate of salary increase	2.75%	2.75%
Defined benefit cost [Member] | Benefit obligations [Member]
Pension Obligations [Line Items]
Discount rate	3.73%	3.45%
Defined benefit cost [Member] | Service cost [Member]
Pension Obligations [Line Items]
Discount rate	3.75%	3.50%
Defined benefit cost [Member] | Males [Member]
Pension Obligations [Line Items]
Average longevity at retirement age for current pensioners (years)	21.1	21
Defined benefit cost [Member] | Females [Member]
Pension Obligations [Line Items]
Average longevity at retirement age for current pensioners (years)	23.9	23.7
Defined benefit obligation [Member]
Pension Obligations [Line Items]
Discount rate	3.08%	3.73%
Expected rate of salary increase	2.75%	2.75%
Defined benefit obligation [Member] | Males [Member]
Pension Obligations [Line Items]
Average longevity at retirement age for current pensioners (years)	21.2	21.1
Average longevity at retirement age for current employees (future pensioners) (years)	23	23
Defined benefit obligation [Member] | Females [Member]
Pension Obligations [Line Items]
Average longevity at retirement age for current pensioners (years)	23.9	23.9
Average longevity at retirement age for current employees (future pensioners) (years)	25.6	25.6

Pension obligations (Schedule_9

Pension obligations (Schedule of fair value of plan assets) - (Details) - Pension obligations [Member] - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Pension Obligations [Line Items]
Plan assets, at fair value	$ 202,119	$ 175,795	$ 341,432
Level 1 [Member]
Pension Obligations [Line Items]
Plan assets, at fair value	78,268	56,401
Level 2 [Member]
Pension Obligations [Line Items]
Plan assets, at fair value	123,851	119,394
Level 3 [Member]
Pension Obligations [Line Items]
Plan assets, at fair value	0	0
Money market instruments [Member]
Pension Obligations [Line Items]
Cash and cash equivalents, amount contributed to fair value of plan assets	1,588	3,072
Money market instruments [Member] | Level 1 [Member]
Pension Obligations [Line Items]
Cash and cash equivalents, amount contributed to fair value of plan assets	1,588	3,072
Money market instruments [Member] | Level 2 [Member]
Pension Obligations [Line Items]
Cash and cash equivalents, amount contributed to fair value of plan assets	0	0
Money market instruments [Member] | Level 3 [Member]
Pension Obligations [Line Items]
Cash and cash equivalents, amount contributed to fair value of plan assets	0	0
Pooled equity funds [Member]
Pension Obligations [Line Items]
Investment funds, amount contributed to fair value of plan assets	76,680	53,329
Pooled equity funds [Member] | Level 1 [Member]
Pension Obligations [Line Items]
Investment funds, amount contributed to fair value of plan assets	76,680	53,329
Pooled equity funds [Member] | Level 2 [Member]
Pension Obligations [Line Items]
Investment funds, amount contributed to fair value of plan assets	0	0
Pooled equity funds [Member] | Level 3 [Member]
Pension Obligations [Line Items]
Investment funds, amount contributed to fair value of plan assets	0	0
Pooled fixed income funds [Member]
Pension Obligations [Line Items]
Investment funds, amount contributed to fair value of plan assets	103,646	91,854
Pooled fixed income funds [Member] | Level 1 [Member]
Pension Obligations [Line Items]
Investment funds, amount contributed to fair value of plan assets	0	0
Pooled fixed income funds [Member] | Level 2 [Member]
Pension Obligations [Line Items]
Investment funds, amount contributed to fair value of plan assets	103,646	91,854
Pooled fixed income funds [Member] | Level 3 [Member]
Pension Obligations [Line Items]
Investment funds, amount contributed to fair value of plan assets	0	0
Alternative investment funds [Member]
Pension Obligations [Line Items]
Investment funds, amount contributed to fair value of plan assets	19,438	26,871
Alternative investment funds [Member] | Level 1 [Member]
Pension Obligations [Line Items]
Investment funds, amount contributed to fair value of plan assets	0	0
Alternative investment funds [Member] | Level 2 [Member]
Pension Obligations [Line Items]
Investment funds, amount contributed to fair value of plan assets	19,438	26,871
Alternative investment funds [Member] | Level 3 [Member]
Pension Obligations [Line Items]
Investment funds, amount contributed to fair value of plan assets	0	0
Balanced Fund Member
Pension Obligations [Line Items]
Investment funds, amount contributed to fair value of plan assets	767	669
Balanced Fund Member | Level 1 [Member]
Pension Obligations [Line Items]
Investment funds, amount contributed to fair value of plan assets	0	0
Balanced Fund Member | Level 2 [Member]
Pension Obligations [Line Items]
Investment funds, amount contributed to fair value of plan assets	767	669
Balanced Fund Member | Level 3 [Member]
Pension Obligations [Line Items]
Investment funds, amount contributed to fair value of plan assets	$ 0	$ 0

Other employee benefits (Schedu

Other employee benefits (Schedule of additional information about other employee benefit plans) - (Details) - Other employee benefits [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Other Employee Benefits [Line Items]
Opening defined benefit obligation	$ 93,528	$ 107,829
Current service cost	3,060	3,455
Past service cost	0	255
Interest cost	3,600	3,683
Effects of movements in exchange rates	4,864	(8,587)
Remeasurement actuarial (gains)/losses:
Arising from changes in demographic assumptions	0	(9,996)
Arising from changes in financial assumptions	14,094	2,809
Arising from experience adjustments	87	(3,472)
Benefits paid	(2,537)	(2,448)
Closing defined benefit obligation	$ 116,696	$ 93,528

Other employee benefits (Sche_2

Other employee benefits (Schedule of additional information about other employee benefit plans, balance by member group) - (Details) - Other employee benefits [Member] - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Employee Benefits [Line Items]
Closing defined benefit obligation	$ 116,696	$ 93,528	$ 107,829
Active members [Member]
Other Employee Benefits [Line Items]
Closing defined benefit obligation	60,801	47,249
Inactive members [Member]
Other Employee Benefits [Line Items]
Closing defined benefit obligation	$ 55,895	$ 46,279

Other employee benefits (Sche_3

Other employee benefits (Schedule of changes in fair value of assets of other employee benefits plan) - (Details) - Other employee benefits [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Other Employee Benefits [Line Items]
Employer contributions	$ 2,537	$ 2,448
Benefits paid	(2,537)	(2,448)
Plan assets, at fair value	$ 0	$ 0

Other employee benefits (Sche_4

Other employee benefits (Schedule of net benefit liability for other employee benefits - (Details) - Other employee benefits [Member] - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Employee Benefits [Line Items]
Unfunded benefit obligation	$ 116,696	$ 93,528	$ 107,829
Vacation accrual and other - non-current	2,888	2,664
Net liability	$ 119,584	$ 96,192

Other employee benefits (Sche_5

Other employee benefits (Schedule of detailed information about other employee benefits plan) - (Details) - Other employee benefits [Member] - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Other Employee Benefits [Line Items]
Other employee benefits liability - current	$ 2,806	$ 2,564
Other employee benefits liability - non-current	116,778	93,628
Net liability	$ 119,584	$ 96,192

Other employee benefits (Sche_6

Other employee benefits (Schedule of detailed information about employee future benefit expense) - (Details) - Other employee benefits [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Other Employee Benefits [Line Items]
Current service cost	$ 3,060	$ 3,710
Net interest cost	3,600	3,683
Components recognized in consolidated income statements	$ 6,660	$ 7,393

Other employee benefits (Sche_7

Other employee benefits (Schedule of detailed information about remeasurement of other long term employee benefits) - (Details) - Other employee benefits [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Remeasurement on the net defined benefit liability:
Actuarial (gains)/losses arising from changes in demographic assumptions	$ 0	$ (9,996)
Actuarial (gains)/losses arising from changes in financial assumptions	14,094	2,809
Actuarial gains arising from experience adjustments	87	(3,472)
Defined benefit loss/(gain) related to remeasurement	14,181	(10,659)
Total other employee future benefit cost	$ 20,841	$ (3,266)

Other employee benefits (Sche_8

Other employee benefits (Schedule of other employee benefit plan, assumptions used (Details) - Other employee benefits [Member] - Year	Dec. 31, 2019	Dec. 31, 2018
Defined benefit cost [Member]
Other Employee Benefits [Line Items]
Discount rate	3.88%	3.64%
Defined benefit cost [Member] | Initial [Member]
Other Employee Benefits [Line Items]
Weighted average health care trend rate	5.74%	5.97%
Defined benefit cost [Member] | Ultimate [Member]
Other Employee Benefits [Line Items]
Weighted average health care trend rate	4.00%	4.00%
Defined benefit cost [Member] | Males [Member]
Other Employee Benefits [Line Items]
Average longevity at retirement age for current pensioners (years)	21.1	21
Defined benefit cost [Member] | Females [Member]
Other Employee Benefits [Line Items]
Average longevity at retirement age for current pensioners (years)	23.9	23.7
Defined benefit obligation [Member]
Other Employee Benefits [Line Items]
Discount rate	3.17%	3.88%
Defined benefit obligation [Member] | Initial [Member]
Other Employee Benefits [Line Items]
Weighted average health care trend rate	5.68%	5.74%
Defined benefit obligation [Member] | Ultimate [Member]
Other Employee Benefits [Line Items]
Weighted average health care trend rate	4.00%	4.00%
Defined benefit obligation [Member] | Males [Member]
Other Employee Benefits [Line Items]
Average longevity at retirement age for current pensioners (years)	21.2	21.1
Average longevity at retirement age for current employees (future pensioners) (years)	23.1	23
Defined benefit obligation [Member] | Females [Member]
Other Employee Benefits [Line Items]
Average longevity at retirement age for current pensioners (years)	23.9	23.9
Average longevity at retirement age for current employees (future pensioners) (years)	25.6	25.6

Income and mining taxes (Schedu

Income and mining taxes (Schedule of detailed information about effective income tax expense recovery) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Major components of tax expense (income) [abstract]
Current income taxes (Canada)	$ 11,196	$ 5,251
Current income taxes (Peru)	13,723	19,103
Current mining taxes (Canada)	341	9,085
Current mining taxes (Peru)	4,379	11,030
Adjustments in respect of prior years	6,273	707
Current tax expense (income) and adjustments for current tax of prior periods	35,912	45,176
Deferred income taxes (recoveries) - origination, revaluation and/or reversal of temporary differences (Canada)	(59,082)	25,811
Deferred income taxes (recoveries) - origination, revaluation and/or reversal of temporary differences (Peru)	(6,280)	10,780
Deferred income taxes (recoveries) - origination, revaluation and/or reversal of temporary differences (United States)	(68,106)	3,170
Deferred mining taxes (recoveries) - origination, revaluation and/or reversal of temporary difference (Canada)	(10,266)	414
Deferred mining taxes (recoveries) - origination, revaluation and/or reversal of temporary difference (Peru)	(1,948)	(621)
Adjustments in respect of prior years	817	691
Deferred tax expense (income)	(144,865)	40,245
Tax (recovery) expense	$ (108,953)	$ 85,421

Income and mining taxes (Sche_2

Income and mining taxes (Schedule of deferred taxes) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred tax assets	$ 69,950	$ 15,513
Deferred income tax liability	(237,832)	(324,090)
Net deferred tax liability balance	(167,882)	(308,577)	$ (277,466)
Income tax effect of temporary differences [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net deferred tax liability balance	(163,268)	(291,800)
Income tax effect of temporary differences [Member] | Canada [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred tax assets	69,950	15,513
Income tax effect of temporary differences [Member] | Peru [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred income tax liability	(191,611)	(196,452)
Income tax effect of temporary differences [Member] | United States [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred income tax liability	(41,607)	(110,861)
Mining tax effect of temporary differences recognized [Member] | Canada [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred tax assets	5,095
Deferred income tax liability		(5,119)
Net deferred tax liability balance	5,095	(5,119)
Mining tax effect of temporary differences recognized [Member] | Peru [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred income tax liability	(9,709)	(11,658)
Net deferred tax liability balance	$ (9,710)	$ (11,658)

Income and mining taxes (Sche_3

Income and mining taxes (Schedule of changes in deferred tax assets and liabilities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Major components of tax expense (income) [abstract]
Net deferred tax liability balance, beginning of period	$ (308,577)	$ (277,466)
Deferred tax recovery (expense)	144,865	(40,245)
OCI transactions	1,878	520
Foreign currency translation on the deferred tax liability	(6,048)	8,614
Net deferred tax liability balance, end of year	$ (167,882)	$ (308,577)

Income and mining taxes (Sche_4

Income and mining taxes (Schedule of reconciliation to statutory tax rate) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Major components of tax expense (income) [abstract]
Statutory tax rate	27.00%	27.00%
Tax expense at statutory rate	$ (122,246)	$ 46,126
Effect of Deductions related to mining taxes	(1,493)	(5,976)
Adjusted income taxes	(123,739)	40,150
Mining tax (recovery) expense	(6,674)	19,214
Adjusted income tax expense after mining tax expense (recovery)	(130,413)	59,364
Permanent differences related to capital items	3,270	(2,903)
Permanent differences related to other income tax permanent differences	1,747	(454)
Impact of remeasurement on decommissioning liability	(16,265)	3,898
Temporary income tax differences not recognized	6,219	4,449
Non-deductible impairment on UCM receivable	7,041	0
Withholding tax on dividend	6,826	0
Impact related to differences in tax rates in foreign operations	20,338	9,594
Impact of changes in statutory tax rates	(259)	45
Foreign exchange on non-monetary items	(6,633)	11,408
Impact related to tax assessments and tax return amendments	(824)	20
Tax (recovery) expense	$ (108,953)	$ 85,421

Income and mining taxes (Sche_5

Income and mining taxes (Schedule of temporary differences recognized) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred income tax (liability) asset	$ (167,882)	$ (308,577)	$ (277,466)
Property, plant and equipment [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred income tax asset	(96,841)	(83,407)
Deferred income tax (recovery) expense	13,434	(18,646)
Deferred income tax liability	259,145	339,037
Deferred income tax expense (recovery)	(79,892)	25,456
Pension obligation [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred income tax asset	11,332	7,817
Deferred income tax (recovery) expense	(1,115)	2,739
Other employee benefits [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred income tax asset	16,837	13,488
Deferred income tax (recovery) expense	(3,349)	3,254
Deferred income tax liability	(80)	240
Deferred income tax expense (recovery)	(320)	48
Decommissioning And Restoration Obligation [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred income tax asset	41,208	7,817
Deferred income tax (recovery) expense	(33,391)	(2,055)
Asset retirement obligations [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred income tax liability	(833)	(918)
Deferred income tax expense (recovery)	85	(129)
Non-capital losses [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred income tax asset	90,446	72,470
Deferred income tax (recovery) expense	(17,976)	19,025
Deferred income tax liability	(28,643)	(27,374)
Deferred income tax expense (recovery)	(1,269)	165
Share issuance and debt costs [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred income tax asset	6,540	10,896
Deferred income tax (recovery) expense	4,361	4,807
Deferred Revenue [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred income tax asset	(112)	(7,622)
Deferred income tax (recovery) expense	(7,510)	5,096
Other [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred income tax asset	540	(5,946)
Deferred income tax (recovery) expense	(12,839)	4,640
Deferred income tax liability	3,629	(3,672)
Deferred income tax expense (recovery)	7,302	(3,439)
Income tax effect of temporary differences [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Deferred income tax asset	69,950	15,513
Deferred income tax (recovery) expense	(58,385)	18,860
Deferred income tax liability	233,218	307,313
Deferred income tax expense (recovery)	(74,094)	22,101
Deferred income tax (liability) asset	(163,268)	(291,800)
Net deferred income tax expense (recovery)	$ (132,479)	$ 40,961

Income and mining taxes (Sche_6

Income and mining taxes (Schedule of temporary differences not recognized) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Temporary differences not recognized	$ 531,338	$ 569,254
Property, plant and equipment [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Temporary differences not recognized	33,269	0
Capital losses [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Temporary differences not recognized	159,545	200,455
Other employee benefits [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Temporary differences not recognized	68,866	77,166
Asset retirement obligations [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Temporary differences not recognized	146,679	175,091
Non-capital losses [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Temporary differences not recognized	$ 122,979	$ 116,542

Income and mining taxes (Sche_7

Income and mining taxes (Schedule of temporary differences - deferred mining tax assets and liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net deferred tax asset (liability)	$ (167,882)	$ (308,577)	$ (277,466)
Mining property plant and equipment tax effect of temporary differences recognized [Member] | Canada [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net deferred tax asset (liability)	5,095	(5,119)
Mining property plant and equipment tax effect of temporary differences recognized [Member] | Peru [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Net deferred tax asset (liability)	$ (9,710)	$ (11,658)

Share capital (Schedule of deta

Share capital (Schedule of detailed information about shares activity) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disclosure of classes of share capital [line items]
Beginning Balance	$ 2,178,856	$ 2,112,345
Warrants exercised	0	11
Ending Balance	$ 1,848,123	$ 2,178,856
Share capital [Member]
Disclosure of classes of share capital [line items]
Number of shares issued and fully paid, beginning balance	261,271,188	261,271,188
Beginning Balance	$ 1,777,340	$ 1,777,409
Share issue costs, net of tax (in shares)	0	0
Share issue costs, net of tax	$ 0	$ (80)
Warrants exercised (in shares)	0	963
Warrants exercised	$ 0	$ 11
Number of shares issued and fully paid, ending balance	261,272,151	261,271,188
Ending Balance	$ 1,777,340	$ 1,777,340

Share-based payment (Schedule o

Share-based payment (Schedule of number and weighted average exercise prices of other equity instruments) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)Share	Dec. 31, 2019CAD ($)Share	Dec. 31, 2018USD ($)Share	Dec. 31, 2018CAD ($)Share
Deferred Share Unit [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of units granted during the year	337,999	337,999	158,886	158,886
Weighted average price (C$/unit) | $		$ 5.89		$ 7.91
Expenses (gain) recognized during the year | $	$ 1,157		$ (1,877)
Payments made during the year | $	$ 1,668		$ 0
Restricted Share Unit [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of restricted share units, beginning of year	3,666,867	3,666,867	3,405,713	3,405,713
Number of units granted during the year	1,080,741	1,080,741	1,031,701	1,031,701
Credits for dividends	7,554	7,554	9,724	9,724
Number of units forfeited during the year	(573,914)	(573,914)	(21,190)	(21,190)
Number of units vested	(1,957,249)	(1,957,249)	(759,081)	(759,081)
Number of restricted share units, end of year	2,223,999	2,223,999	3,666,867	3,666,867
Weighted average price (C$/unit) | $		$ 8.98		$ 10.33
Expenses (gain) recognized during the year | $	$ 1,557		$ (496)
Payments made during the year | $	$ 9,380		$ 6,435

Share-based payment (Schedule_2

Share-based payment (Schedule of number and weighted average exercise prices of share options) (Details)	12 Months Ended
	Dec. 31, 2019CAD ($)Share	Dec. 31, 2018CAD ($)Share
Disclosure of terms and conditions of share-based payment arrangement [abstract]
Number of shares subject to option, beginning of year | Share	0	523,352
Weighted average exercise price of share options outstanding in share-based payment arrangement, beginning of year | $	$ 0	$ 15.86
Number of shares subject to option, forfeited | Share	0	0
Weighted average exercise price of options forfeited | $	$ 0	$ 0
Number of shares subject to option, expired | Share	0	(523,352)
Weighted average exercise price of options expired | $	$ 0	$ 15.86
Number of shares subject to option, end of year | Share	0	0
Weighted average exercise price of share options outstanding in share-based payment arrangement, end of year | $	$ 0	$ 0

Financial instruments (Schedule

Financial instruments (Schedule of fair value measurement) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of fair value measurement of assets [line items]
Cash and cash equivalents	$ 396,146	$ 515,497	$ 356,499
Non-hedge derivative assets	1,712	6,628
Prepayment option - embedded derivative	2,585	3,664
Investments at FVTPL	11,287	15,159
Deferred Rosemont acquisition consideration	24,491	0
Other financial liabilities	67,860	31,196
Embedded derivatives	9,074	7,201
Non-hedge derivative liabilities	10,295	2,634
Fair value [Member]
Disclosure of fair value measurement of assets [line items]
Cash and cash equivalents	396,146	515,497
Restricted cash	337	3,738
Trade and other receivables	91,046	126,311
Non-hedge derivative assets	1,712	6,628
Prepayment option - embedded derivative	2,585	3,664
Investments at FVTPL	11,287	15,159
Total financial assets	503,113	670,997
Trade and other payables	184,604	164,628
Deferred Rosemont acquisition consideration	24,491
Other financial liabilities	21,338	17,425
Senior unsecured notes	1,050,126	988,294
Embedded derivatives	9,074	7,201
Non-hedge derivative liabilities	10,295	2,634
Total financial liabilities	1,299,928	1,180,182
Net financial liability	(796,815)	(509,185)
Carrying Amounts [Member]
Disclosure of fair value measurement of assets [line items]
Cash and cash equivalents	396,146	515,497
Restricted cash	337	3,738
Trade and other receivables	91,046	126,311
Non-hedge derivative assets	1,712	6,628
Prepayment option - embedded derivative	2,585	3,664
Investments at FVTPL	11,287	15,159
Total financial assets	503,113	670,997
Trade and other payables	184,604	164,628
Deferred Rosemont acquisition consideration	24,491
Other financial liabilities	24,000	21,361
Senior unsecured notes	994,143	992,970
Embedded derivatives	9,074	7,201
Non-hedge derivative liabilities	10,295	2,634
Total financial liabilities	1,246,607	1,188,794
Net financial liability	$ (743,494)	$ (517,797)

Financial instruments (Schedu_2

Financial instruments (Schedule of significant unobservable inputs used in fair value measurement of assets and liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Disclosure of fair value measurement of assets [line items]
Non-hedge derivatives	$ 1,712	$ 6,628
Investments at FVTPL	11,287	15,159
Prepayment option embedded derivative	2,585	3,664
Financial assets measured at fair value	15,584	25,451
Embedded derivatives	9,074	7,201
Non-hedge derivatives	10,295	2,634
Financial liabilities measured at fair value	19,369	9,835
Level 1 [Member]
Disclosure of fair value measurement of assets [line items]
Non-hedge derivatives	0	0
Investments at FVTPL	11,287	15,159
Prepayment option embedded derivative	0	0
Financial assets measured at fair value	11,287	15,159
Embedded derivatives	0	0
Non-hedge derivatives	0	0
Financial liabilities measured at fair value	0	0
Level 2 [Member]
Disclosure of fair value measurement of assets [line items]
Non-hedge derivatives	1,712	6,628
Investments at FVTPL	0	0
Prepayment option embedded derivative	2,585	3,664
Financial assets measured at fair value	4,297	10,292
Embedded derivatives	9,074	7,201
Non-hedge derivatives	10,295	2,634
Financial liabilities measured at fair value	19,369	9,835
Level 3 [Member]
Disclosure of fair value measurement of assets [line items]
Non-hedge derivatives	0	0
Investments at FVTPL	0	0
Prepayment option embedded derivative	0	0
Financial assets measured at fair value	0	0
Embedded derivatives	0	0
Non-hedge derivatives	0	0
Financial liabilities measured at fair value	$ 0	$ 0

Financial instruments (Schedu_3

Financial instruments (Schedule of net position consisted of contracts awaiting final pricing) (Details) - Embedded Derivatives [Member]	Dec. 31, 2019Toz$ / Tonne$ / OZ	Dec. 31, 2018Toz$ / Tonne$ / OZ
Copper [Member]
Disclosure of risk management strategy related to hedge accounting [line items]
Sales awaiting final pricing | T	33,102	30,519
Average YTD price ($/unit) | $ / Tonne	2.80	2.69
Zinc [Member]
Disclosure of risk management strategy related to hedge accounting [line items]
Sales awaiting final pricing | T	0	199
Average YTD price ($/unit) | $ / Tonne	0	1.13
Gold [Member]
Disclosure of risk management strategy related to hedge accounting [line items]
Sales awaiting final pricing | oz	16,152	15,528
Average YTD price ($/unit) | $ / OZ	1,522	1,279
Silver [Member]
Disclosure of risk management strategy related to hedge accounting [line items]
Sales awaiting final pricing | oz	124,371	96,646
Average YTD price ($/unit) | $ / OZ	17.86	15.45

Financial instruments (Schedu_4

Financial instruments (Schedule of detailed information about foreign currency risk) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of risk management strategy related to hedge accounting [line items]
Cash and cash equivalents	$ 396,146	$ 515,497	$ 356,499
Other financial asset	13,336	25,525
Other financial liabilities	(67,860)	(31,196)
Currency risk [Member] | Amounts Held In CAD [Member]
Disclosure of risk management strategy related to hedge accounting [line items]
Cash and cash equivalents	8,394	11,498
Trade and other receivables	374	711
Other financial asset	11,287	15,159
Trade and other payables	(5,719)	(5,341)
Other financial liabilities	0	0
Net financial liability	14,336	22,027
Currency risk [Member] | Amounts Held In USD [Member]
Disclosure of risk management strategy related to hedge accounting [line items]
Cash and cash equivalents	21,217	29,740
Trade and other receivables	56,998	42,056
Other financial asset	0	0
Trade and other payables	(435)	(3,133)
Other financial liabilities	0	0
Net financial liability	77,780	68,663
Currency risk [Member] | Amounts Held In PEN [Member]
Disclosure of risk management strategy related to hedge accounting [line items]
Cash and cash equivalents	7,617	13,934
Trade and other receivables	25,413	1,272
Other financial asset	0	0
Trade and other payables	(22,618)	(19,513)
Other financial liabilities	(24,000)	(21,361)
Net financial liability	$ (13,588)	$ (25,668)

Financial instruments (Schedu_5

Financial instruments (Schedule of foreign currency risk) (Details) - Currency risk [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
USD / CAD exchange rate [Member]
Disclosure of risk management strategy related to hedge accounting [line items]
Sensitivity analysis, variance, percentage	10.00%	10.00%
Effect of variance increase on after-tax profit	$ 3.4	$ 5
Effect of variance decrease on after-tax profit	$ (4.1)	$ (6)
USD / PEN exchange rate [Member]
Disclosure of risk management strategy related to hedge accounting [line items]
Sensitivity analysis, variance, percentage	10.00%	10.00%
Effect of variance increase on after-tax profit	$ 0.8	$ 1.5
Effect of variance decrease on after-tax profit	$ (1)	$ (1.8)

Financial instruments (Schedu_6

Financial instruments (Schedule of commodity price risk) (Details) - Commodity price risk [Member] $ in Millions	12 Months Ended
	Dec. 31, 2019USD ($)$ / lb	Dec. 31, 2018USD ($)$ / lb
Copper prices [Member]
Disclosure of risk management strategy related to hedge accounting [line items]
Sensitivity analysis, variance, price | $ / lb	0.30	0.30
Effect of variance increase on after-tax profit	$ (2)	$ (3.1)
Effect of variance decrease on after-tax profit	$ 2	$ 3.1
Zinc prices [Member]
Disclosure of risk management strategy related to hedge accounting [line items]
Sensitivity analysis, variance, price | $ / lb	0.10	0.10
Effect of variance increase on after-tax profit	$ 1	$ 0.5
Effect of variance decrease on after-tax profit	$ (1)	$ (0.5)

Financial instruments (Schedu_7

Financial instruments (Schedule of share price risk explanatory) (Details) - Share price risk [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disclosure of risk management strategy related to hedge accounting [line items]
Sensitivity analysis, variance, percentage	25.00%	25.00%
Effect of variance increase on after-tax profit	$ 2.8	$ 3.8
Effect of variance decrease on after-tax profit	$ (2.8)	$ (3.8)

Financial instruments (Schedu_8

Financial instruments (Schedule of interest rate risk) (Details) - Interest rate risk [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disclosure of risk management strategy related to hedge accounting [line items]
Sensitivity analysis, variance, percentage	2.00%	2.00%
Effect of variance increase on after-tax profit	$ 2.3	$ (3.3)
Effect of variance decrease on after-tax profit	$ (2.6)	$ 3.2

Financial instruments (Schedu_9

Financial instruments (Schedule of liquidity risk) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of risk management strategy related to hedge accounting [line items]
Cash and cash equivalents	$ 396,146	$ 515,497	$ 356,499
Non-hedge derivative assets	1,712	6,628
Other financial liabilities	(67,860)	(31,196)
Long-term debt, including embedded derivative	(985,255)	(981,030)
Embedded derivatives	9,074	7,201
Derivative financial liabilities	10,295	2,634
12 months or less
Disclosure of risk management strategy related to hedge accounting [line items]
Cash and cash equivalents	396,146	515,497
Restricted cash	337
Trade and other receivables	89,451	112,258
Non-hedge derivative assets	1,712	6,628
Assets used to manage liquidity risk	487,646	634,383
Trade and other payables, including embedded derivative	(184,604)	(164,628)
Other financial liabilities	(6,672)	(3,719)
Deferred Rosemont acquisition consideration	0
Long-term debt, including embedded derivative	(72,165)	(79,263)
Non-derivative financial liabilities	(263,441)	(247,610)
Embedded derivatives	(9,074)
Non-hedge derivative contracts	(10,295)	(2,634)
Derivative financial liabilities	(19,369)	(2,634)
13-36 months [Member]
Disclosure of risk management strategy related to hedge accounting [line items]
Cash and cash equivalents	0	0
Restricted cash	0
Trade and other receivables	0	11,440
Non-hedge derivative assets	0	0
Assets used to manage liquidity risk	0	11,440
Trade and other payables, including embedded derivative	0	0
Other financial liabilities	(4,811)	(4,757)
Deferred Rosemont acquisition consideration	(10,000)
Long-term debt, including embedded derivative	(149,500)	(156,933)
Non-derivative financial liabilities	(164,311)	(161,690)
Embedded derivatives	0
Non-hedge derivative contracts	0	0
Derivative financial liabilities	0	0
37-60 months
Disclosure of risk management strategy related to hedge accounting [line items]
Cash and cash equivalents	0	0
Restricted cash	0
Trade and other receivables	0	13,215
Non-hedge derivative assets	0	0
Assets used to manage liquidity risk	0	13,215
Trade and other payables, including embedded derivative	0	0
Other financial liabilities	(4,734)	(3,068)
Deferred Rosemont acquisition consideration	(20,000)
Long-term debt, including embedded derivative	(1,128,875)	(535,000)
Non-derivative financial liabilities	(1,153,609)	(538,068)
Embedded derivatives	0
Non-hedge derivative contracts	0	0
Derivative financial liabilities	0	0
More than 60 months [Member]
Disclosure of risk management strategy related to hedge accounting [line items]
Cash and cash equivalents	0	0
Restricted cash	0
Trade and other receivables	1,595	0
Non-hedge derivative assets	0	0
Assets used to manage liquidity risk	1,595	0
Trade and other payables, including embedded derivative	0	0
Other financial liabilities	(17,506)	(20,310)
Deferred Rosemont acquisition consideration	0
Long-term debt, including embedded derivative	0	(668,625)
Non-derivative financial liabilities	(17,506)	(688,935)
Embedded derivatives	0
Non-hedge derivative contracts	0	0
Derivative financial liabilities	0	0
Carrying amount [Member]
Disclosure of risk management strategy related to hedge accounting [line items]
Cash and cash equivalents	396,146	515,497
Restricted cash	337
Trade and other receivables	91,046	126,311
Non-hedge derivative assets	1,712	6,628
Assets used to manage liquidity risk	489,241	648,436
Trade and other payables, including embedded derivative	(184,604)	(164,628)
Other financial liabilities	(24,000)	(21,361)
Deferred Rosemont acquisition consideration	(24,491)
Long-term debt, including embedded derivative	(991,558)	(981,030)
Non-derivative financial liabilities	(1,224,653)	(1,167,019)
Embedded derivatives	(9,074)
Non-hedge derivative contracts	(10,295)	(2,634)
Derivative financial liabilities	(19,369)	(2,634)
Contractual cash flows [Member]
Disclosure of risk management strategy related to hedge accounting [line items]
Cash and cash equivalents	396,146	515,497
Restricted cash	337
Trade and other receivables	91,046	136,913
Non-hedge derivative assets	1,712	6,628
Assets used to manage liquidity risk	489,241	659,038
Trade and other payables, including embedded derivative	(184,604)	(164,628)
Other financial liabilities	(33,723)	(31,854)
Deferred Rosemont acquisition consideration	(30,000)
Long-term debt, including embedded derivative	(1,350,540)	(1,439,821)
Non-derivative financial liabilities	(1,598,867)	(1,636,303)
Embedded derivatives	(9,074)
Non-hedge derivative contracts	(10,295)	(2,634)
Derivative financial liabilities	$ (19,369)	$ (2,634)

Commitments and contingencies_3

Commitments and contingencies (Schedule of maturity analysis of operating lease payments) (Details) $ in Thousands	Dec. 31, 2019USD ($)
Disclosure of maturity analysis of operating lease payments [line items]
Minimum lease payments payable under non-cancellable operating lease	$ 84,255
Within one year [Member]
Disclosure of maturity analysis of operating lease payments [line items]
Minimum lease payments payable under non-cancellable operating lease	57,860
After one year but not more than five years [Member]
Disclosure of maturity analysis of operating lease payments [line items]
Minimum lease payments payable under non-cancellable operating lease	26,395
More than five years [Member]
Disclosure of maturity analysis of operating lease payments [line items]
Minimum lease payments payable under non-cancellable operating lease	$ 0

Related parties (Schedule of su

Related parties (Schedule of subsidiaries) (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
HudBay Marketing & Sales Inc. [Member]
Disclosure of transactions between related parties [line items]
Beneficial ownership of ultimate controlling party (HudBay Minerals Inc.)	100.00%	100.00%
HudBay Peru Inc. [Member]
Disclosure of transactions between related parties [line items]
Beneficial ownership of ultimate controlling party (HudBay Minerals Inc.)	100.00%	100.00%
HudBay Peru S.A.C. [Member]
Disclosure of transactions between related parties [line items]
Beneficial ownership of ultimate controlling party (HudBay Minerals Inc.)	100.00%	100.00%
HudBay (BVI) Inc. [Member]
Disclosure of transactions between related parties [line items]
Beneficial ownership of ultimate controlling party (HudBay Minerals Inc.)	100.00%	100.00%
Hudbay Arizona Inc. [Member]
Disclosure of transactions between related parties [line items]
Beneficial ownership of ultimate controlling party (HudBay Minerals Inc.)	100.00%	100.00%
Rosemont Copper Company [Member]
Disclosure of transactions between related parties [line items]
Beneficial ownership of ultimate controlling party (HudBay Minerals Inc.)	100.00%	100.00%

Related parties (Schedule of in

Related parties (Schedule of information about key management personnel) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disclosure of transactions between related parties [abstract]
Short-term employee benefits	$ 8,319	$ 8,652
Post-employment benefits	762	762
Long-term share-based awards	6,966	5,970
Total key management personnel compensation	$ 16,047	$ 15,384

Supplementary cash flow infor_4

Supplementary cash flow information (Schedule of change in non-cash working capital) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Supplementary Cash Flow Information [Abstract]
Trade and other receivables	$ 3,252	$ 16,198
Other financial assets/liabilities	12,540	(17,290)
Inventories	(11,759)	(32)
Prepaid expenses	(3,484)	(38)
Trade and other payables	5,613	(19,608)
Provisions and other liabilities	(2,591)	(1,030)
Change in non-cash working capital	$ 3,572	$ (21,800)

Segmented information (Schedule

Segmented information (Schedule of segments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disclosure of operating segments [line items]
Revenue from external customers	$ 1,237,439	$ 1,472,366
Cost of sales
Mine operating costs	741,342	765,959
Depreciation and amortization	344,555	332,667
Gross profit	151,542	373,740
Selling and administrative expenses	36,170	27,243
Exploration and evaluation	30,774	28,570
Other operating expenses	51,116	19,071
Impairment loss	322,249
Results from operating activities	(288,767)	298,856
Finance income	(8,527)	(8,450)
Finance expenses	162,888	152,000
Other finance (gain) losses	9,635	(15,531)
Loss before tax	(452,763)	170,837
Tax recovery	(108,953)	85,421
(Loss) profit for the year	(343,810)	85,416
Manitoba [Member]
Disclosure of operating segments [line items]
Revenue from external customers	537,421	667,322
Cost of sales
Mine operating costs	385,159	412,760
Depreciation and amortization	135,429	121,515
Gross profit	16,833	133,047
Selling and administrative expenses	0	0
Exploration and evaluation	18,476	12,302
Other operating expenses	8,201	5,433
Impairment loss	0
Results from operating activities	(9,844)	115,312
Peru [Member]
Disclosure of operating segments [line items]
Revenue from external customers	700,018	805,044
Cost of sales
Mine operating costs	356,183	353,199
Depreciation and amortization	209,126	211,152
Gross profit	134,709	240,693
Selling and administrative expenses	0	0
Exploration and evaluation	5,804	5,640
Other operating expenses	14,022	11,739
Results from operating activities	114,883	223,314
Arizona [Member]
Disclosure of operating segments [line items]
Revenue from external customers	0	0
Cost of sales
Mine operating costs	0	0
Depreciation and amortization	0	0
Gross profit	0	0
Selling and administrative expenses	0	0
Exploration and evaluation	0	0
Other operating expenses	28,149	539
Impairment loss	322,249
Results from operating activities	(350,398)	(539)
Corporate and other activities [Member]
Disclosure of operating segments [line items]
Revenue from external customers	0	0
Cost of sales
Mine operating costs	0	0
Depreciation and amortization	0	0
Gross profit	0	0
Selling and administrative expenses	36,170	27,243
Exploration and evaluation	6,494	10,628
Other operating expenses	744	1,360
Impairment loss	0
Results from operating activities	$ (43,408)	$ (39,231)

Segmented information (Schedu_2

Segmented information (Schedule of segments, assets and liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Disclosure of operating segments [line items]
Total assets	$ 4,455,961	$ 4,685,635
Total liabilities	2,607,838	2,506,779
Property, plant and equipment	3,662,559	3,819,812
Manitoba [Member]
Disclosure of operating segments [line items]
Total assets	774,800	621,253
Total liabilities	551,171	424,576
Property, plant and equipment	684,679	572,947
Peru [Member]
Disclosure of operating segments [line items]
Total assets	2,556,895	2,751,525
Total liabilities	926,642	921,773
Property, plant and equipment	2,253,404	2,353,229
Arizona [Member]
Disclosure of operating segments [line items]
Total assets	700,799	896,693
Total liabilities	78,988	115,470
Property, plant and equipment	691,538	868,921
Corporate and other activities [Member]
Disclosure of operating segments [line items]
Total assets	423,467	416,164
Total liabilities	1,051,037	1,044,960
Property, plant and equipment	32,938	$ 24,715
Corporate and other activities [Member] | Nevada [Member]
Disclosure of operating segments [line items]
Property, plant and equipment	$ 27,300

Segmented information (Schedu_3

Segmented information (Schedule of segments, additions to property, plant and equipment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disclosure of operating segments [line items]
Additions to property, plant and equipment	$ 284,963	$ 199,582
Manitoba [Member]
Disclosure of operating segments [line items]
Additions to property, plant and equipment	143,418	123,896
Peru [Member]
Disclosure of operating segments [line items]
Additions to property, plant and equipment	101,717	55,818
Arizona [Member]
Disclosure of operating segments [line items]
Additions to property, plant and equipment	38,923	19,846
Corporate and other activities [Member]
Disclosure of operating segments [line items]
Additions to property, plant and equipment	$ 905	$ 22

Segmented information (Schedu_4

Segmented information (Schedule of geographical areas, revenue by customer location) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disclosure of operating segments [line items]
Revenue from external customers	$ 1,237,439	$ 1,472,366
Canada [Member]
Disclosure of operating segments [line items]
Revenue from external customers	418,636	553,411
United States [Member]
Disclosure of operating segments [line items]
Revenue from external customers	209,382	211,681
Switzerland [Member]
Disclosure of operating segments [line items]
Revenue from external customers	162,167	253,165
Germany [Member]
Disclosure of operating segments [line items]
Revenue from external customers	10,731	52,530
China [Member]
Disclosure of operating segments [line items]
Revenue from external customers	158,795	140,440
Peru [Member]
Disclosure of operating segments [line items]
Revenue from external customers	110,411	65,721
Philippines [Member]
Disclosure of operating segments [line items]
Revenue from external customers	71,506	84,687
United Kingdom [Member]
Disclosure of operating segments [line items]
Revenue from external customers	62,462	68,346
Other [Member]
Disclosure of operating segments [line items]
Revenue from external customers	$ 33,349	$ 42,385