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Property, plant and equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
IfrsStatementLineItems [Line Items]    
Cost, beginning $ 5,599,536 $ 5,135,969
Accumulated amortization and impairment, beginning (3,160,922) (2,840,694)
Balance at the beginning of the year 2,438,614 2,295,275
Additions 323,482 310,468
Disposals and write-offs (16,579) (4,089)
Depreciation (225,864) (219,011)
Impairment (loss) reversal of long-lived assets (42,404) (71,956)
Divestments (13,453)  
Foreign exchange effects (355,428) 117,078
Remeasurement (9,947) 11,654
Transfers (913) (805)
Balance at the end of the year 2,097,508 2,438,614
Cost, ending 5,018,137 5,599,536
Accumulated amortization and impairment, ending (2,920,629) (3,160,922)
Lands Dam And Buildings [Member]    
IfrsStatementLineItems [Line Items]    
Cost, beginning 1,710,083 1,512,360
Accumulated amortization and impairment, beginning (795,717) (671,028)
Balance at the beginning of the year 914,366  
Disposals and write-offs (23)  
Depreciation (104,929)  
Impairment (loss) reversal of long-lived assets 12,147  
Divestments (2,990)  
Foreign exchange effects (163,559)  
Transfers 243,150  
Balance at the end of the year 898,162 914,366
Cost, ending 1,673,095 1,710,083
Accumulated amortization and impairment, ending $ (774,933) $ (795,717)
Average annual depreciation rates 4.00% 4.00%
Machinery Equipment And Facilities [Member]    
IfrsStatementLineItems [Line Items]    
Cost, beginning $ 2,896,565 $ 2,636,582
Accumulated amortization and impairment, beginning (2,048,145) (1,870,591)
Balance at the beginning of the year 848,420 765,991
Additions 667 953
Disposals and write-offs (3,408) (212)
Depreciation (113,679) (121,004)
Impairment (loss) reversal of long-lived assets 964 (27,748)
Divestments (4,265)  
Foreign exchange effects (133,501) 43,495
Transfers 112,594 186,945
Balance at the end of the year 707,792 848,420
Cost, ending 2,515,318 2,896,565
Accumulated amortization and impairment, ending $ (1,807,526) $ (2,048,145)
Average annual depreciation rates 9.00% 9.00%
Construction in progress [member]    
IfrsStatementLineItems [Line Items]    
Cost, beginning $ 512,925 $ 521,191
Accumulated amortization and impairment, beginning (67,485) (65,386)
Balance at the beginning of the year 445,440 455,805
Additions 276,839 309,039
Disposals and write-offs (8,984) (3,834)
Impairment (loss) reversal of long-lived assets (7,149) (10,890)
Divestments (290)  
Foreign exchange effects (34,196) 18,088
Transfers (357,948) (322,768)
Balance at the end of the year 313,712 445,440
Cost, ending 381,216 512,925
Accumulated amortization and impairment, ending (67,504) (67,485)
Asset Retirement Obligation [Member]    
IfrsStatementLineItems [Line Items]    
Cost, beginning 219,449 200,665
Accumulated amortization and impairment, beginning (139,088) (125,118)
Balance at the beginning of the year 80,361 75,547
Additions 45,891 318
Depreciation (5,221) (5,165)
Impairment (loss) reversal of long-lived assets 1,495 (6,691)
Divestments (1,377)  
Foreign exchange effects (16,857) 4,698
Remeasurement (9,947) 11,654
Balance at the end of the year 94,345 80,361
Cost, ending 204,903 219,449
Accumulated amortization and impairment, ending (110,558) (139,088)
Asset Retirement Obligation [Member] | Gross carrying amount [member]    
IfrsStatementLineItems [Line Items]    
Cost, beginning 219,449  
Cost, ending   219,449
Mining assets [member]    
IfrsStatementLineItems [Line Items]    
Cost, beginning 215,913 221,077
Accumulated amortization and impairment, beginning (94,153) (92,652)
Balance at the beginning of the year 121,760 128,425
Disposals and write-offs (4,111)  
Depreciation (834) (1,372)
Impairment (loss) reversal of long-lived assets (50,197) (7,257)
Divestments (4,150)  
Foreign exchange effects (2,946) 1,502
Transfers 30 462
Balance at the end of the year 59,552 121,760
Cost, ending 208,627 215,913
Accumulated amortization and impairment, ending (149,075) (94,153)
Mining assets [member] | Gross carrying amount [member]    
IfrsStatementLineItems [Line Items]    
Cost, beginning 215,913  
Cost, ending   215,913
Other property, plant and equipment [member]    
IfrsStatementLineItems [Line Items]    
Cost, beginning 44,601 44,094
Accumulated amortization and impairment, beginning (16,334) (15,919)
Balance at the beginning of the year 28,267 28,175
Additions 85 45
Disposals and write-offs (53) (43)
Depreciation (1,201) (1,212)
Impairment (loss) reversal of long-lived assets 336 (2,513)
Divestments (381)  
Foreign exchange effects (4,369) 1,455
Transfers 1,261 2,360
Balance at the end of the year 23,945 28,267
Cost, ending 34,978 44,601
Accumulated amortization and impairment, ending (11,033) (16,334)
Dam And Buildings [Member]    
IfrsStatementLineItems [Line Items]    
Balance at the beginning of the year $ 914,366 841,332
Additions   113
Depreciation   (90,258)
Impairment (loss) reversal of long-lived assets   (16,857)
Foreign exchange effects   47,840
Transfers   132,196
Balance at the end of the year   $ 914,366