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Property, plant and equipment - Summary of property, plant and equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance $ 4,088,202 $ 3,988,476
Write-down of assets (38,660) (6,298)
Ending balance 3,998,493 4,088,202
Land and buildings    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 183,733 144,270
Ending balance 185,940 183,733
Plant and equipment    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 1,294,805 1,103,270
Ending balance 1,231,300 1,294,805
Capital works in progress    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 83,078 109,361
Ending balance 83,513 83,078
Mineral properties    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 2,429,879 2,538,116
Ending balance 2,399,048 2,429,879
Capitalized Evaluation    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 96,707 93,459
Ending balance 98,692 96,707
Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 6,844,689 6,676,254
Additions/transfers 216,243 195,230
IFRS 16 transition adjustment   9,379
Proceeds on pre-commercial production sales, net   (12,159)
Commercial production transfers   0
(Impairment) reversal   (3,578)
Write-down of assets (40,030) (1,995)
Other movements/transfers 1,373 883
Transfer to assets held for sale   (11,690)
Disposals (10,877) (7,635)
Ending balance 7,011,398 6,844,689
Cost | Land and buildings    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 242,511 192,244
Additions/transfers 14,737 17,379
IFRS 16 transition adjustment   7,555
Proceeds on pre-commercial production sales, net   0
Commercial production transfers   27,070
(Impairment) reversal   0
Write-down of assets 0 0
Other movements/transfers 1,841 (1,715)
Transfer to assets held for sale   0
Disposals (402) (22)
Ending balance 258,687 242,511
Cost | Plant and equipment    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 2,319,388 2,112,033
Additions/transfers 82,285 85,929
IFRS 16 transition adjustment   1,734
Proceeds on pre-commercial production sales, net   0
Commercial production transfers   92,791
(Impairment) reversal   11,690
Write-down of assets 0 (1,979)
Other movements/transfers 22,371 33,335
Transfer to assets held for sale   (11,690)
Disposals (10,297) (4,455)
Ending balance 2,413,747 2,319,388
Cost | Capital works in progress    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 83,078 109,361
Additions/transfers 61,135 19,735
IFRS 16 transition adjustment   90
Proceeds on pre-commercial production sales, net   0
Commercial production transfers   0
(Impairment) reversal   (15,268)
Write-down of assets (40,030) 0
Other movements/transfers (20,594) (30,103)
Transfer to assets held for sale   0
Disposals (76) (737)
Ending balance 83,513 83,078
Cost | Mineral properties    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 4,103,005 4,169,157
Additions/transfers 55,971 68,794
IFRS 16 transition adjustment   0
Proceeds on pre-commercial production sales, net   (12,159)
Commercial production transfers   (119,861)
(Impairment) reversal   0
Write-down of assets 0 0
Other movements/transfers (2,217) (505)
Transfer to assets held for sale   0
Disposals 0 (2,421)
Ending balance 4,156,759 4,103,005
Cost | Capitalized Evaluation    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 96,707 93,459
Additions/transfers 2,115 3,393
IFRS 16 transition adjustment   0
Proceeds on pre-commercial production sales, net   0
Commercial production transfers   0
(Impairment) reversal   0
Write-down of assets 0 (16)
Other movements/transfers (28) (129)
Transfer to assets held for sale   0
Disposals (102) 0
Ending balance 98,692 96,707
Accumulated depreciation    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (2,756,487) (2,687,778)
(Impairment) reversal   100,492
Other movements/transfers (1,863) (1,042)
Disposals 4,049 2,065
Depreciation for the year (258,604) (170,224)
Ending balance (3,012,905) (2,756,487)
Accumulated depreciation | Land and buildings    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (58,778) (47,974)
(Impairment) reversal   0
Other movements/transfers (125) (206)
Disposals 54 7
Depreciation for the year (13,898) (10,605)
Ending balance (72,747) (58,778)
Accumulated depreciation | Plant and equipment    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (1,024,583) (1,008,763)
(Impairment) reversal   90,825
Other movements/transfers (1,985) (1,049)
Disposals 3,880 2,058
Depreciation for the year (159,759) (107,654)
Ending balance (1,182,447) (1,024,583)
Accumulated depreciation | Capital works in progress    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 0 0
(Impairment) reversal   0
Other movements/transfers 0 0
Disposals 0 0
Depreciation for the year 0 0
Ending balance 0 0
Accumulated depreciation | Mineral properties    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (1,673,126) (1,631,041)
(Impairment) reversal   9,667
Other movements/transfers 247 213
Disposals 115 0
Depreciation for the year (84,947) (51,965)
Ending balance (1,757,711) (1,673,126)
Accumulated depreciation | Capitalized Evaluation    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 0 0
(Impairment) reversal   0
Other movements/transfers 0 0
Disposals 0 0
Depreciation for the year 0 0
Ending balance $ 0 $ 0