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Intangible assets and goodwill - Movements in Identifiable Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance $ 214,254 $ 214,254
Additions 1,504 649
Amortization for the year (13,845) (8,374)
Impairment losses recognized in profit or loss for the year (34,857) (478)
Other increases / decreases for foreign currency exchange rates (159) 2,256
Decrease for classification as held for sale 0  
Transferred from available for sale 0 16
Other increases (decreases) 406 (188)
Subtotal (46,951) (6,119)
Closing balance 167,303 214,254
Gross carrying amount    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 273,484  
Closing balance 240,378 273,484
Accumulated depreciation and amortization    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance (59,230)  
Closing balance (73,075) (59,230)
Indeifinite intangible assets | Goodwill    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 34,596 34,596
Additions 0  
Impairment losses recognized in profit or loss for the year (33,629)  
Other increases / decreases for foreign currency exchange rates 0  
Decrease for classification as held for sale 0  
Transferred from available for sale 0  
Other increases (decreases) 0 (7,370)
Subtotal (33,629) (7,370)
Closing balance 967 34,596
Indeifinite intangible assets | Gross carrying amount | Goodwill    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 38,130  
Closing balance 4,501 38,130
Indeifinite intangible assets | Accumulated depreciation and amortization | Goodwill    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance (3,534)  
Closing balance (3,534) (3,534)
IT programs | Finite intangible assets    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 3,447 3,447
Additions 349 296
Amortization for the year (1,039) (1,716)
Impairment losses recognized in profit or loss for the year 0  
Other increases / decreases for foreign currency exchange rates (4) (17)
Decrease for classification as held for sale 0  
Transferred from available for sale 0  
Other increases (decreases) 496 58
Subtotal (198) (1,379)
Closing balance 3,249 3,447
IT programs | Gross carrying amount | Finite intangible assets    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 35,616  
Closing balance 36,457 35,616
IT programs | Accumulated depreciation and amortization | Finite intangible assets    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance (32,169)  
Closing balance (33,208) (32,169)
Mining rights | Finite intangible assets    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 149,532 149,532
Additions 1,141 344
Amortization for the year (8,482) (2,863)
Impairment losses recognized in profit or loss for the year (1,228) (48)
Other increases / decreases for foreign currency exchange rates 0 2,283
Decrease for classification as held for sale 0  
Transferred from available for sale 0 16
Other increases (decreases) (90) (246)
Subtotal (8,659) (514)
Closing balance 140,873 149,532
Mining rights | Gross carrying amount | Finite intangible assets    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 162,893  
Closing balance 162,716 162,893
Mining rights | Accumulated depreciation and amortization | Finite intangible assets    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance (13,361)  
Closing balance (21,843) (13,361)
Water rights and rights of way | Indeifinite intangible assets    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 4,909 4,909
Additions 0  
Impairment losses recognized in profit or loss for the year 0 (430)
Other increases / decreases for foreign currency exchange rates 0 (4)
Decrease for classification as held for sale 0  
Transferred from available for sale 0  
Other increases (decreases) 0  
Subtotal 0 (434)
Closing balance 4,909 4,909
Water rights and rights of way | Indeifinite intangible assets | Gross carrying amount    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 7,420  
Closing balance 7,420 7,420
Water rights and rights of way | Indeifinite intangible assets | Accumulated depreciation and amortization    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance (2,511)  
Closing balance (2,511) (2,511)
Water rights | Finite intangible assets    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 15,158 15,158
Additions 0  
Amortization for the year (3,789) (2,842)
Impairment losses recognized in profit or loss for the year 0  
Other increases / decreases for foreign currency exchange rates 0  
Decrease for classification as held for sale 0  
Transferred from available for sale 0  
Other increases (decreases) 0  
Subtotal (3,789) (2,842)
Closing balance 11,369 15,158
Water rights | Gross carrying amount | Finite intangible assets    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 18,000  
Closing balance 18,000 18,000
Water rights | Accumulated depreciation and amortization | Finite intangible assets    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance (2,842)  
Closing balance (6,631) (2,842)
Customer-related intangible assets | Finite intangible assets    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 0  
Additions 0  
Impairment losses recognized in profit or loss for the year 0  
Other increases / decreases for foreign currency exchange rates 0  
Decrease for classification as held for sale 0  
Transferred from available for sale 0  
Other increases (decreases) 0  
Subtotal 0  
Closing balance 0 0
Customer-related intangible assets | Gross carrying amount | Finite intangible assets    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 1,778  
Closing balance 1,778 1,778
Customer-related intangible assets | Accumulated depreciation and amortization | Finite intangible assets    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance (1,778)  
Closing balance (1,778) (1,778)
Intellectual property | Finite intangible assets    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 6,481 6,481
Additions 0  
Amortization for the year (476) (889)
Impairment losses recognized in profit or loss for the year 0  
Other increases / decreases for foreign currency exchange rates (155)  
Decrease for classification as held for sale 0  
Transferred from available for sale 0  
Other increases (decreases) 0 7,370
Subtotal (631) 6,481
Closing balance 5,850 6,481
Intellectual property | Gross carrying amount | Finite intangible assets    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 7,370  
Closing balance 7,215 7,370
Intellectual property | Accumulated depreciation and amortization | Finite intangible assets    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance (889)  
Closing balance (1,365) (889)
Other intangible assets | Finite intangible assets    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 131 131
Additions 14 9
Amortization for the year (59) (64)
Impairment losses recognized in profit or loss for the year 0  
Other increases / decreases for foreign currency exchange rates 0 (6)
Decrease for classification as held for sale 0  
Transferred from available for sale 0  
Other increases (decreases) 0  
Subtotal (45) (61)
Closing balance 86 131
Other intangible assets | Gross carrying amount | Finite intangible assets    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 2,277  
Closing balance 2,291 2,277
Other intangible assets | Accumulated depreciation and amortization | Finite intangible assets    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance (2,146)  
Closing balance $ (2,205) $ (2,146)