v3.26.1
Property, plant and equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
IfrsStatementLineItems [Line Items]    
Balance at the beginning of the year $ 2,097,508 $ 2,438,614
Cost, beginning 4,974,216 5,599,536
Accumulated amortization and impairment, beginning (2,876,708) (3,160,922)
Additions 360,173 323,482
Disposals and write-offs (3,316) (16,579)
Depreciation (193,275) (225,864)
Impairment (loss) reversal of long-lived assets 7,863 (42,404)
Foreign exchange effects 159,741 (355,428)
Remeasurement 3,093 (9,947)
Effect of new subsidiary acquisition 854  
Transfers 1,031 (913)
Balance at the end of the year 2,433,672 2,097,508
Cost, ending 5,449,822 4,974,216
Accumulated amortization and impairment, ending (3,016,150) (2,876,708)
Divestments   (13,453)
Lands Dam And Buildings [Member]    
IfrsStatementLineItems [Line Items]    
Balance at the beginning of the year 898,162 914,366
Cost, beginning 1,673,095 1,710,083
Accumulated amortization and impairment, beginning (774,933) (795,717)
Disposals and write-offs (46) (23)
Depreciation (72,746) (104,929)
Impairment (loss) reversal of long-lived assets 2,761 12,147
Foreign exchange effects 75,273 (163,559)
Effect of new subsidiary acquisition 571  
Transfers 156,214 243,150
Balance at the end of the year 1,060,189 898,162
Cost, ending 1,942,174 1,673,095
Accumulated amortization and impairment, ending $ (881,985) $ (774,933)
Average annual depreciation rates 4.00% 4.00%
Divestments   $ (2,990)
Machinery Equipment And Facilities [Member]    
IfrsStatementLineItems [Line Items]    
Balance at the beginning of the year $ 707,792 848,420
Cost, beginning 2,487,702 2,896,565
Accumulated amortization and impairment, beginning (1,779,910) (2,048,145)
Additions 2 667
Disposals and write-offs (2,337) (3,408)
Depreciation (110,002) (113,679)
Impairment (loss) reversal of long-lived assets (1,415) 964
Foreign exchange effects 60,144 (133,501)
Effect of new subsidiary acquisition 55  
Transfers 52,087 112,594
Balance at the end of the year 706,326 707,792
Cost, ending 2,586,948 2,487,702
Accumulated amortization and impairment, ending $ (1,880,622) $ (1,779,910)
Average annual depreciation rates 11.00% 9.00%
Divestments   $ (4,265)
Construction in progress [member]    
IfrsStatementLineItems [Line Items]    
Balance at the beginning of the year $ 313,712 445,440
Cost, beginning 381,216 512,925
Accumulated amortization and impairment, beginning (67,504) (67,485)
Additions 351,857 276,839
Disposals and write-offs (851) (8,984)
Impairment (loss) reversal of long-lived assets (3,963) (7,149)
Foreign exchange effects 11,260 (34,196)
Transfers (202,601) (357,948)
Balance at the end of the year 469,414 313,712
Cost, ending 542,522 381,216
Accumulated amortization and impairment, ending (73,108) (67,504)
Divestments   (290)
Asset Retirement Obligation [Member]    
IfrsStatementLineItems [Line Items]    
Balance at the beginning of the year 94,345 80,361
Cost, beginning 188,759 219,449
Accumulated amortization and impairment, beginning (94,414) (139,088)
Additions 8,304 45,891
Depreciation (8,785) (5,221)
Impairment (loss) reversal of long-lived assets 9,331 1,495
Foreign exchange effects 10,522 (16,857)
Remeasurement 3,093 (9,947)
Balance at the end of the year 116,810 94,345
Cost, ending 213,674 188,759
Accumulated amortization and impairment, ending (96,864) (94,414)
Divestments   (1,377)
Mining assets [member]    
IfrsStatementLineItems [Line Items]    
Balance at the beginning of the year 59,552 121,760
Cost, beginning 208,627 215,913
Accumulated amortization and impairment, beginning (149,075) (94,153)
Disposals and write-offs   (4,111)
Depreciation (1,020) (834)
Impairment (loss) reversal of long-lived assets 1,143 (50,197)
Foreign exchange effects 710 (2,946)
Transfers (4,707) 30
Balance at the end of the year 55,678 59,552
Cost, ending 126,979 208,627
Accumulated amortization and impairment, ending (71,301) (149,075)
Divestments   (4,150)
Other property, plant and equipment [member]    
IfrsStatementLineItems [Line Items]    
Balance at the beginning of the year 23,945 28,267
Cost, beginning 34,817 44,601
Accumulated amortization and impairment, beginning (10,872) (16,334)
Additions 10 85
Disposals and write-offs (82) (53)
Depreciation (722) (1,201)
Impairment (loss) reversal of long-lived assets 6 336
Foreign exchange effects 1,832 (4,369)
Effect of new subsidiary acquisition 228  
Transfers 38 1,261
Balance at the end of the year 25,255 23,945
Cost, ending 37,525 34,817
Accumulated amortization and impairment, ending $ (12,270) (10,872)
Average annual depreciation rates 8.00%  
Divestments   $ (381)