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Income tax and deferred taxes - Reconciliation of Changes in Deferred Tax Liabilities (Assets) (Details) - USD ($)
$ in Thousands
 12 Months Ended
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)