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Income tax and deferred taxes - Reconciliation of Changes in Deferred Tax Liabilities (Assets) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Statement [Line Items] |  |
Deferred tax assets and liabilities, net opening balance | $ 110,416 | $ 156,101
Increase (decrease) in deferred taxes in profit or loss | (430,978) | (27,763)
Deferred taxes related to items credited (charged) directly to equity | 5,916 | (17,922)
Total increases (decreases) in deferred tax liabilities (assets) | (425,062) | (45,685)
Deferred tax assets and liabilities, net end of period | (314,646) | 110,416
Unrealized loss |  |
Statement [Line Items] |  |
Deferred tax assets and liabilities, net opening balance | (144,181) | (90,585)
Increase (decrease) in deferred taxes in profit or loss | (511,514) | (53,596)
Deferred taxes related to items credited (charged) directly to equity | 0 | 0
Total increases (decreases) in deferred tax liabilities (assets) | (511,514) | (53,596)
Deferred tax assets and liabilities, net end of period | (655,695) | (144,181)
Property, plant and equipment and capitalized interest |  |
Statement [Line Items] |  |
Deferred tax assets and liabilities, net opening balance | 189,073 | 187,168
Increase (decrease) in deferred taxes in profit or loss | 55,487 | 1,905
Deferred taxes related to items credited (charged) directly to equity | 0 | 0
Total increases (decreases) in deferred tax liabilities (assets) | 55,487 | 1,905
Deferred tax assets and liabilities, net end of period | 244,560 | 189,073
Restoration and rehabilitation provision |  |
Statement [Line Items] |  |
Deferred tax assets and liabilities, net opening balance | (6,567) |
Increase (decrease) in deferred taxes in profit or loss | 1,882 |
Deferred taxes related to items credited (charged) directly to equity | 0 |
Total increases (decreases) in deferred tax liabilities (assets) | 1,882 |
Deferred tax assets and liabilities, net end of period | (4,685) | (6,567)
Facility closure provision |  |
Statement [Line Items] |  |
Deferred tax assets and liabilities, net opening balance | (6,567) | (6,597)
Increase (decrease) in deferred taxes in profit or loss |  | 30
Deferred taxes related to items credited (charged) directly to equity |  | 0
Total increases (decreases) in deferred tax liabilities (assets) |  | 30
Deferred tax assets and liabilities, net end of period |  | (6,567)
Manufacturing expenses |  |
Statement [Line Items] |  |
Deferred tax assets and liabilities, net opening balance | 108,181 | 107,215
Increase (decrease) in deferred taxes in profit or loss | 31,202 | 966
Deferred taxes related to items credited (charged) directly to equity | 0 | 0
Total increases (decreases) in deferred tax liabilities (assets) | 31,202 | 966
Deferred tax assets and liabilities, net end of period | 139,383 | 108,181
Employee benefits and unemployment insurance |  |
Statement [Line Items] |  |
Deferred tax assets and liabilities, net opening balance | 7,486 | 6,669
Increase (decrease) in deferred taxes in profit or loss | 2,779 | 687
Deferred taxes related to items credited (charged) directly to equity | (1,270) | 130
Total increases (decreases) in deferred tax liabilities (assets) | 1,509 | 817
Deferred tax assets and liabilities, net end of period | 8,995 | 7,486
Vacation accrual |  |
Statement [Line Items] |  |
Deferred tax assets and liabilities, net opening balance | (6,039) | (6,138)
Increase (decrease) in deferred taxes in profit or loss | (1,611) | 99
Deferred taxes related to items credited (charged) directly to equity | 0 | 0
Total increases (decreases) in deferred tax liabilities (assets) | (1,611) | 99
Deferred tax assets and liabilities, net end of period | (7,650) | (6,039)
Inventory provision |  |
Statement [Line Items] |  |
Deferred tax assets and liabilities, net opening balance | (20,557) | (22,200)
Increase (decrease) in deferred taxes in profit or loss | (6,955) | 1,643
Deferred taxes related to items credited (charged) directly to equity | 0 | 0
Total increases (decreases) in deferred tax liabilities (assets) | (6,955) | 1,643
Deferred tax assets and liabilities, net end of period | (27,512) | (20,557)
Materials provision |  |
Statement [Line Items] |  |
Deferred tax assets and liabilities, net opening balance | (10,554) | (8,812)
Increase (decrease) in deferred taxes in profit or loss | (1,361) | (1,742)
Deferred taxes related to items credited (charged) directly to equity | 0 | 0
Total increases (decreases) in deferred tax liabilities (assets) | (1,361) | (1,742)
Deferred tax assets and liabilities, net end of period | (11,915) | (10,554)
Derivative financial instruments |  |
Statement [Line Items] |  |
Deferred tax assets and liabilities, net opening balance | 0 | 0
Increase (decrease) in deferred taxes in profit or loss | (7,172) | 14,246
Deferred taxes related to items credited (charged) directly to equity | 7,172 | (14,246)
Total increases (decreases) in deferred tax liabilities (assets) | 0 | 0
Deferred tax assets and liabilities, net end of period | 0 | 0
Other employee benefits |  |
Statement [Line Items] |  |
Deferred tax assets and liabilities, net opening balance | (929) | 0
Increase (decrease) in deferred taxes in profit or loss | (248) | (929)
Deferred taxes related to items credited (charged) directly to equity | 0 | 0
Total increases (decreases) in deferred tax liabilities (assets) | (248) | (929)
Deferred tax assets and liabilities, net end of period | (1,177) | (929)
Research and development expenses |  |
Statement [Line Items] |  |
Deferred tax assets and liabilities, net opening balance | 5,387 | 3,581
Increase (decrease) in deferred taxes in profit or loss | 6,907 | 1,806
Deferred taxes related to items credited (charged) directly to equity | 0 | 0
Total increases (decreases) in deferred tax liabilities (assets) | 6,907 | 1,806
Deferred tax assets and liabilities, net end of period | 12,294 | 5,387
Bad debt provision |  |
Statement [Line Items] |  |
Deferred tax assets and liabilities, net opening balance | (2,708) | (5,072)
Increase (decrease) in deferred taxes in profit or loss | 1,993 | 2,364
Deferred taxes related to items credited (charged) directly to equity | 0 | 0
Total increases (decreases) in deferred tax liabilities (assets) | 1,993 | 2,364
Deferred tax assets and liabilities, net end of period | (715) | (2,708)
Provision for legal complaints and expenses |  |
Statement [Line Items] |  |
Deferred tax assets and liabilities, net opening balance | (334) | (19,637)
Increase (decrease) in deferred taxes in profit or loss | (6,493) | 19,303
Deferred taxes related to items credited (charged) directly to equity | 0 | 0
Total increases (decreases) in deferred tax liabilities (assets) | (6,493) | 19,303
Deferred tax assets and liabilities, net end of period | (6,827) | (334)
Loan approval expenses |  |
Statement [Line Items] |  |
Deferred tax assets and liabilities, net opening balance | 8,967 | 5,212
Increase (decrease) in deferred taxes in profit or loss | (174) | 3,755
Deferred taxes related to items credited (charged) directly to equity | 0 | 0
Total increases (decreases) in deferred tax liabilities (assets) | (174) | 3,755
Deferred tax assets and liabilities, net end of period | 8,793 | 8,967
Junior mining companies valued based on stock price |  |
Statement [Line Items] |  |
Deferred tax assets and liabilities, net opening balance | (5,243) | 3,929
Increase (decrease) in deferred taxes in profit or loss | 0 | (5,354)
Deferred taxes related to items credited (charged) directly to equity | 17 | (3,818)
Total increases (decreases) in deferred tax liabilities (assets) | 17 | (9,172)
Deferred tax assets and liabilities, net end of period | (5,226) | (5,243)
Royality |  |
Statement [Line Items] |  |
Deferred tax assets and liabilities, net opening balance | 4,545 | 3,012
Increase (decrease) in deferred taxes in profit or loss | 1,257 | 1,521
Deferred taxes related to items credited (charged) directly to equity | (3) | 12
Total increases (decreases) in deferred tax liabilities (assets) | 1,254 | 1,533
Deferred tax assets and liabilities, net end of period | 5,799 | 4,545
Tax loss benefit |  |
Statement [Line Items] |  |
Deferred tax assets and liabilities, net opening balance | (7,113) | (844)
Increase (decrease) in deferred taxes in profit or loss | (1,502) | (6,269)
Deferred taxes related to items credited (charged) directly to equity | 0 | 0
Total increases (decreases) in deferred tax liabilities (assets) | (1,502) | (6,269)
Deferred tax assets and liabilities, net end of period | (8,615) | (7,113)
Other |  |
Statement [Line Items] |  |
Deferred tax assets and liabilities, net opening balance | (8,862) | (1,454)
Increase (decrease) in deferred taxes in profit or loss | (7,187) | (7,408)
Deferred taxes related to items credited (charged) directly to equity | 0 | 0
Total increases (decreases) in deferred tax liabilities (assets) | (7,187) | (7,408)
Deferred tax assets and liabilities, net end of period | (16,049) | (8,862)
Foreign items (other) |  |
Statement [Line Items] |  |
Deferred tax assets and liabilities, net opening balance | (136) | 654
Increase (decrease) in deferred taxes in profit or loss | 11,732 | (790)
Deferred taxes related to items credited (charged) directly to equity | 0 | 0
Total increases (decreases) in deferred tax liabilities (assets) | 11,732 | (790)
Deferred tax assets and liabilities, net end of period | $ 11,596 | $ (136)

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