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Intangible assets and goodwill - Movements in Identifiable Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance $ 156,832 $ 167,303
Additions 17,208 408
Amortization for the year (7,758) (10,601)
Impairment losses recognized in income for the year (10) (9)
Other increases / decreases for foreign currency exchange rates 3,629 3
Other increases (decreases) (985) (272)
Subtotal 12,084 (10,471)
Closing balance 168,916 156,832
Indefinite | Goodwill    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 958 967
Additions 0 0
Impairment losses recognized in income for the year (10) (9)
Other increases / decreases for foreign currency exchange rates 0 0
Other increases (decreases) 0 0
Subtotal (10) (9)
Closing balance 948 958
Historical cost    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 238,730  
Closing balance 259,148 238,730
Historical cost | Indefinite | Goodwill    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 4,492  
Closing balance 4,491 4,492
Accumulated amortization    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance (81,898)  
Closing balance (90,232) (81,898)
Accumulated amortization | Indefinite | Goodwill    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance (3,534)  
Closing balance (3,543) (3,534)
IT programs | Intangible assets other than goodwill    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 3,190 3,249
Additions 6,700 197
Amortization for the year (1,430) (1,451)
Impairment losses recognized in income for the year 0 0
Other increases / decreases for foreign currency exchange rates (41) 6
Other increases (decreases) 11 1,189
Subtotal 5,240 (59)
Closing balance 8,430 3,190
IT programs | Historical cost | Intangible assets other than goodwill    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 37,849  
Closing balance 43,851 37,849
IT programs | Accumulated amortization | Intangible assets other than goodwill    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance (34,659)  
Closing balance (35,421) (34,659)
Mining rights | Intangible assets other than goodwill    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 134,924 140,873
Additions 0 196
Amortization for the year (1,608) (4,684)
Impairment losses recognized in income for the year 0 0
Other increases / decreases for foreign currency exchange rates 3,694 0
Other increases (decreases) (3,891) (1,461)
Subtotal (1,805) (5,949)
Closing balance 133,119 134,924
Mining rights | Historical cost | Intangible assets other than goodwill    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 161,451  
Closing balance 162,492 161,451
Mining rights | Accumulated amortization | Intangible assets other than goodwill    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance (26,527)  
Closing balance (29,373) (26,527)
Water rights and rights of way | Indefinite    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 4,909 4,909
Additions 0 0
Impairment losses recognized in income for the year 0 0
Other increases / decreases for foreign currency exchange rates 0 0
Other increases (decreases) 0 0
Subtotal 0 0
Closing balance 4,909 4,909
Water rights and rights of way | Historical cost | Indefinite    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 7,420  
Closing balance 7,420 7,420
Water rights and rights of way | Accumulated amortization | Indefinite    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance (2,511)  
Closing balance (2,511) (2,511)
Water rights | Intangible assets other than goodwill    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 7,580 11,369
Additions 0 0
Amortization for the year (3,789) (3,789)
Impairment losses recognized in income for the year 0 0
Other increases / decreases for foreign currency exchange rates 0 0
Other increases (decreases) 0 0
Subtotal (3,789) (3,789)
Closing balance 3,791 7,580
Water rights | Historical cost | Intangible assets other than goodwill    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 18,000  
Closing balance 18,000 18,000
Water rights | Accumulated amortization | Intangible assets other than goodwill    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance (10,420)  
Closing balance (14,209) (10,420)
Intellectual property | Intangible assets other than goodwill    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 5,201 5,850
Additions 10,130 0
Amortization for the year (805) (649)
Impairment losses recognized in income for the year 0 0
Other increases / decreases for foreign currency exchange rates 0 0
Other increases (decreases) 235 0
Subtotal 9,560 (649)
Closing balance 14,761 5,201
Intellectual property | Historical cost | Intangible assets other than goodwill    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 7,215  
Closing balance 17,580 7,215
Intellectual property | Accumulated amortization | Intangible assets other than goodwill    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance (2,014)  
Closing balance (2,819) (2,014)
Other intangible assets | Intangible assets other than goodwill    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 70 86
Additions 378 15
Amortization for the year (126) (28)
Impairment losses recognized in income for the year 0 0
Other increases / decreases for foreign currency exchange rates (24) (3)
Other increases (decreases) 2,660 0
Subtotal 2,888 (16)
Closing balance 2,958 70
Other intangible assets | Historical cost | Intangible assets other than goodwill    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 2,303  
Closing balance 5,314 2,303
Other intangible assets | Accumulated amortization | Intangible assets other than goodwill    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance (2,233)  
Closing balance $ (2,356) $ (2,233)