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Information by business segment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
IfrsStatementLineItems [Line Items]      
Net revenues $ 2,766,481 $ 2,573,233 $ 3,033,990
Cost of sales (2,228,410) (2,274,357) (2,393,936)
Gross profit 538,071 298,876 640,054
Impairment loss of long-lived assets 32,870 114,643 32,512
Other income and expenses, net (33,511) (110,584) (2,674)
Adjusted EBITDA 714,080 406,041 763,205
Change in fair value of energy forward contracts 81 (15,663)
Other restoration obligations 6,960
Divestment and restructuring (9,028)
Share in the results of associates 21,223 23,536 1,885
(Loss) income before income tax (71,851) (296,084) 227,971
Impairment of other assets (9,302)
Operating segments [member]      
IfrsStatementLineItems [Line Items]      
Net revenues 2,766,481 2,573,233 3,033,990
Cost of sales (2,228,410) (2,274,357) (2,393,936)
Gross profit 538,071 298,876 640,054
Selling, general and administrative (127,328) (126,599) (145,170)
Mineral exploration and project evaluation (67,976) (99,612) (98,801)
Impairment loss of long-lived assets (32,870) (114,643) (32,512)
Other income and expenses, net (33,511) (110,584) (2,674)
Operating (loss) income 276,386 (152,562) 360,897
Depreciation and amortization 330,198 310,475 292,140
Miscellaneous adjustments 107,496 248,128 110,168
Adjusted EBITDA 714,080 406,041 763,205
Operating segments [member] | Mining Segment [Member]      
IfrsStatementLineItems [Line Items]      
Net revenues 1,349,666 1,090,276 1,248,027
Cost of sales (1,011,742) (1,026,178) (904,370)
Gross profit 337,924 64,098 343,657
Selling, general and administrative (66,307) (61,690) (64,219)
Mineral exploration and project evaluation (60,939) (90,238) (88,867)
Impairment loss of long-lived assets (32,870) (109,347) (32,276)
Other income and expenses, net (41,714) (67,876) (32,787)
Operating (loss) income 136,094 (265,053) 125,508
Depreciation and amortization 243,111 229,153 206,540
Miscellaneous adjustments 84,866 196,529 110,993
Adjusted EBITDA 464,071 160,629 443,041
Operating segments [member] | Smelting Segment [Member]      
IfrsStatementLineItems [Line Items]      
Net revenues 1,997,341 1,946,661 2,466,967
Cost of sales (1,799,773) (1,726,271) (2,190,530)
Gross profit 197,568 220,390 276,437
Selling, general and administrative (57,197) (61,097) (60,287)
Mineral exploration and project evaluation (7,887) (9,374) (9,934)
Impairment loss of long-lived assets   (5,296) (236)
Other income and expenses, net 7,984 (26,412) 43,049
Operating (loss) income 140,468 118,211 249,029
Depreciation and amortization 86,458 80,471 77,904
Miscellaneous adjustments 22,630 51,599 (825)
Adjusted EBITDA 249,556 250,281 326,108
Operating segments [member] | Adjustment [Member]      
IfrsStatementLineItems [Line Items]      
Impairment loss of long-lived assets (32,870) (114,643) (32,512)
Miscellaneous adjustments (107,496) (248,128) (110,168)
Changes in fair value of offtake agreement (102) 2,268 24,267
Impairment (reversal) of other assets (307)    
Aripuana ramp up impacts (25,158)    
Loss on sale of property, plant and equipment (16,183) (3,734) (698)
Remeasurement in estimates of asset retirement obligations 5,310 3,125 6,182
Remeasurement adjustment of streaming agreement (21,084) (10,121) (10,565)
Change in fair value of energy forward contracts 81 (15,663)  
Other restoration obligations (1,026) (6,960)  
Divestment and restructuring 9,028    
Dividends received in cash (25,185)    
Depreciation and amortization (330,198) (310,475) (292,140)
Share in the results of associates 21,223 23,536 1,885
Net financial results (369,460) (167,058) (134,811)
(Loss) income before income tax (71,851) (296,084) 227,971
Ramp-up expenses of greenfield projects Aripuana   (15,494) (87,540)
Tax voluntary disclosure   (86,906)  
Impairment of other assets     (9,302)
Elimination of intersegment amounts [member]      
IfrsStatementLineItems [Line Items]      
Net revenues (604,034) (468,250) (683,583)
Cost of sales 604,034 468,250 683,583
Material reconciling items [member]      
IfrsStatementLineItems [Line Items]      
Net revenues 23,508 4,546 2,579
Cost of sales (20,929) 9,842 17,381
Gross profit 2,579 14,388 19,960
Selling, general and administrative (3,824) (3,812) (20,664)
Mineral exploration and project evaluation 850    
Other income and expenses, net 219 (16,296) (12,936)
Operating (loss) income (176) (5,720) (13,640)
Depreciation and amortization 629 851 7,696
Adjusted EBITDA $ 453 $ (4,869) $ (5,944)