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Intangible assets and goodwill (Details 4) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance $ 223,084 $ 224,216
Additions 10,255 2,856
Other increases / decreases for foreign currency exchange rates 6 (6)
Decreases through sale (136) (1,314)
Impairment losses recognized in profit for the year (1,798) (1,053)
Other increases (decreases) 309 2,479
Amortization (11,347) (4,094)
Total increases (decreases) (2,711) (1,132)
Closing balance 220,373 223,084
Gross carrying amount [member]    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 260,317 256,049
Additions 10,255 2,856
Other increases / decreases for foreign currency exchange rates 6 (9)
Decreases through sale (136) (1,314)
Other increases (decreases) 311 2,735
Total increases (decreases) 10,436 4,268
Closing balance 270,753 260,317
Accumulated depreciation and amortisation [member]    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance (37,233) (31,833)
Other increases / decreases for foreign currency exchange rates 0 3
Impairment losses recognized in profit for the year (1,798) (1,053)
Other increases (decreases) (2) (256)
Amortization (11,347) (4,094)
Total increases (decreases) (13,147) (5,400)
Closing balance (50,380) (37,233)
Indeifinite Intangible assets [Member] | Goodwill [Member]    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 34,726 34,866
Additions 7,380 0
Other increases / decreases for foreign currency exchange rates 0 0
Decreases through sale 0 0
Impairment losses recognized in profit for the year (140) (140)
Other increases (decreases) 0 0
Amortization 0 0
Total increases (decreases) 7,240 (140)
Closing balance 41,966 34,726
Indeifinite Intangible assets [Member] | Gross carrying amount [member] | Goodwill [Member]    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 38,120 38,120
Additions 7,380 0
Other increases / decreases for foreign currency exchange rates 0 0
Other increases (decreases) 0 0
Total increases (decreases) 7,380 0
Closing balance 45,500 38,120
Indeifinite Intangible assets [Member] | Accumulated depreciation and amortisation [member] | Goodwill [Member]    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance (3,394) (3,254)
Other increases / decreases for foreign currency exchange rates 0 0
Impairment losses recognized in profit for the year (140) (140)
Other increases (decreases) 0 0
Amortization 0 0
Total increases (decreases) (140) (140)
Closing balance (3,534) (3,394)
IT programs [member] | Finite intangible assets [Member]    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 6,011 4,568
Additions 508 2,606
Other increases / decreases for foreign currency exchange rates 5 (4)
Decreases through sale 0 0
Impairment losses recognized in profit for the year (14) 0
Other increases (decreases) 297 2,479
Amortization (1,981) (3,638)
Total increases (decreases) (1,185) 1,443
Closing balance 4,826 6,011
IT programs [member] | Gross carrying amount [member] | Finite intangible assets [Member]    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 34,471 29,137
Additions 508 2,606
Other increases / decreases for foreign currency exchange rates 5 (7)
Decreases through sale 0 0
Other increases (decreases) 297 2,735
Total increases (decreases) 810 5,334
Closing balance 35,281 34,471
IT programs [member] | Accumulated depreciation and amortisation [member] | Finite intangible assets [Member]    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance (28,460) (24,569)
Other increases / decreases for foreign currency exchange rates 0 3
Impairment losses recognized in profit for the year (14) 0
Other increases (decreases) 0 (256)
Amortization (1,981) (3,638)
Total increases (decreases) (1,995) (3,891)
Closing balance (30,455) (28,460)
Mining rights [Member] | Finite intangible assets [Member]    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 157,570 159,256
Additions 2,295 227
Other increases / decreases for foreign currency exchange rates 0 0
Decreases through sale (136) (1,314)
Impairment losses recognized in profit for the year (654) (481)
Other increases (decreases) (2) 0
Amortization (9,027) (118)
Total increases (decreases) (7,524) (1,686)
Closing balance 150,046 157,570
Mining rights [Member] | Gross carrying amount [member] | Finite intangible assets [Member]    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 158,337 159,424
Additions 2,295 227
Other increases / decreases for foreign currency exchange rates 0 0
Decreases through sale (136) (1,314)
Other increases (decreases) 0 0
Total increases (decreases) 2,159 (1,087)
Closing balance 160,496 158,337
Mining rights [Member] | Accumulated depreciation and amortisation [member] | Finite intangible assets [Member]    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance (767) (168)
Other increases / decreases for foreign currency exchange rates 0 0
Impairment losses recognized in profit for the year (654) (481)
Other increases (decreases) (2) 0
Amortization (9,027) (118)
Total increases (decreases) (9,683) (599)
Closing balance (10,450) (767)
Water rights and rights of way [member] | Indeifinite Intangible assets [Member]    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 23,342 23,776
Additions 0 0
Other increases / decreases for foreign currency exchange rates 1 (2)
Decreases through sale 0
Impairment losses recognized in profit for the year 0 (432)
Other increases (decreases) 0 0
Amortization 0 0
Total increases (decreases) 1 (434)
Closing balance 23,343 23,342
Water rights and rights of way [member] | Indeifinite Intangible assets [Member] | Gross carrying amount [member]    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 25,423 25,425
Additions 0 0
Other increases / decreases for foreign currency exchange rates 1 (2)
Decreases through sale 0 0
Other increases (decreases) 0 0
Total increases (decreases) 1 (2)
Closing balance 25,424 25,423
Water rights and rights of way [member] | Indeifinite Intangible assets [Member] | Accumulated depreciation and amortisation [member]    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance (2,081) (1,649)
Other increases / decreases for foreign currency exchange rates 0 0
Impairment losses recognized in profit for the year 0 (432)
Other increases (decreases) 0 0
Amortization 0 0
Total increases (decreases) 0 (432)
Closing balance (2,081) (2,081)
Customer-related intangible assets [member] | Finite intangible assets [Member]    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 1,273 1,573
Additions 0 0
Other increases / decreases for foreign currency exchange rates 0 0
Decreases through sale 0 0
Impairment losses recognized in profit for the year (990) 0
Other increases (decreases) 0 0
Amortization (283) (300)
Total increases (decreases) (1,273) (300)
Closing balance 0 1,273
Customer-related intangible assets [member] | Gross carrying amount [member] | Finite intangible assets [Member]    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 1,778 1,778
Additions 0 0
Other increases / decreases for foreign currency exchange rates 0 0
Decreases through sale 0 0
Other increases (decreases) 0 0
Total increases (decreases) 0 0
Closing balance 1,778 1,778
Customer-related intangible assets [member] | Accumulated depreciation and amortisation [member] | Finite intangible assets [Member]    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance (505) (205)
Other increases / decreases for foreign currency exchange rates 0 0
Impairment losses recognized in profit for the year (990) 0
Other increases (decreases) 0 0
Amortization (283) (300)
Total increases (decreases) (1,273) (300)
Closing balance (1,778) (505)
Other Intangible Assets [Member] | Finite intangible assets [Member]    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 162 177
Additions 72 23
Other increases / decreases for foreign currency exchange rates 0 0
Decreases through sale 0 0
Impairment losses recognized in profit for the year 0 0
Other increases (decreases) 14 0
Amortization (56) (38)
Total increases (decreases) 30 (15)
Closing balance 192 162
Other Intangible Assets [Member] | Gross carrying amount [member] | Finite intangible assets [Member]    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance 2,188 2,165
Additions 72 23
Other increases / decreases for foreign currency exchange rates 0 0
Decreases through sale 0 0
Other increases (decreases) 14 0
Total increases (decreases) 86 23
Closing balance 2,274 2,188
Other Intangible Assets [Member] | Accumulated depreciation and amortisation [member] | Finite intangible assets [Member]    
Disclosure Of Intangible Assets And Goodwill [Line Items]    
Opening balance (2,026) (1,988)
Other increases / decreases for foreign currency exchange rates 0 0
Impairment losses recognized in profit for the year 0 0
Other increases (decreases) 0 0
Amortization (56) (38)
Total increases (decreases) (56) (38)
Closing balance $ (2,082) $ (2,026)