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Property, plant and equipment - Summary of property, plant and equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance $ 4,042,199 $ 4,091,252
Write-down of assets (9,106) (38,660)
Ending balance 4,003,211 4,042,199
Land and buildings    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 185,940 183,733
Ending balance 189,480 185,940
Plant and equipment    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 1,258,324 1,294,805
Ending balance 1,298,282 1,258,324
Capital works in progress    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 83,513 83,078
Ending balance 109,813 83,513
Mineral properties    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 2,415,730 2,432,929
Ending balance 2,402,299 2,415,730
Capitalized Evaluation    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 98,692 96,707
Ending balance 3,337 98,692
Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 7,011,398 6,844,689
Additions/transfers 316,064 216,243
Acquisition of QMX Gold Corporation 82,858  
(Impairment) reversal (3,923)  
Write-down of assets (7,130) (40,030)
Other movements/transfers (10,947) 1,373
Assets disposed of in the sale of Tocantinzinho (210,570)  
Disposals (13,148) (10,877)
Ending balance 7,164,602 7,011,398
Cost | Land and buildings    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 258,687 242,511
Additions/transfers 12,204 14,737
Acquisition of QMX Gold Corporation 2,357  
(Impairment) reversal 0  
Write-down of assets 0 0
Other movements/transfers (2,539) 1,841
Assets disposed of in the sale of Tocantinzinho 0  
Disposals (1,638) (402)
Ending balance 269,071 258,687
Cost | Plant and equipment    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 2,413,747 2,319,388
Additions/transfers 80,760 82,285
Acquisition of QMX Gold Corporation 1,649  
(Impairment) reversal 0  
Write-down of assets (3,520) 0
Other movements/transfers 96,476 22,371
Assets disposed of in the sale of Tocantinzinho (3,693)  
Disposals (10,511) (10,297)
Ending balance 2,574,908 2,413,747
Cost | Capital works in progress    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 83,513 83,078
Additions/transfers 134,237 61,135
Acquisition of QMX Gold Corporation 0  
(Impairment) reversal (3,923)  
Write-down of assets 0 (40,030)
Other movements/transfers (104,014) (20,594)
Assets disposed of in the sale of Tocantinzinho 0  
Disposals 0 (76)
Ending balance 109,813 83,513
Cost | Mineral properties    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 4,156,759 4,103,005
Additions/transfers 85,607 55,971
Acquisition of QMX Gold Corporation 78,852  
(Impairment) reversal 0  
Write-down of assets (3,610) 0
Other movements/transfers (870) (2,217)
Assets disposed of in the sale of Tocantinzinho (108,282)  
Disposals (983) 0
Ending balance 4,207,473 4,156,759
Cost | Capitalized Evaluation    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 98,692 96,707
Additions/transfers 3,256 2,115
Acquisition of QMX Gold Corporation 0  
(Impairment) reversal 0  
Write-down of assets 0 0
Other movements/transfers 0 (28)
Assets disposed of in the sale of Tocantinzinho (98,595)  
Disposals (16) (102)
Ending balance 3,337 98,692
Accumulated depreciation    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (2,969,199) (2,753,437)
(Impairment) reversal (10,003)  
Other movements/transfers 10,909 (1,863)
Assets disposed of in the sale of Tocantinzinho 2,964  
Disposals 6,749 4,049
Depreciation for the year (202,811) (217,948)
Ending balance (3,161,391) (2,969,199)
Accumulated depreciation | Land and buildings    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (72,747) (58,778)
(Impairment) reversal 0  
Other movements/transfers 771 (125)
Assets disposed of in the sale of Tocantinzinho 0  
Disposals 1,121 54
Depreciation for the year (8,736) (13,898)
Ending balance (79,591) (72,747)
Accumulated depreciation | Plant and equipment    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (1,155,423) (1,024,583)
(Impairment) reversal (10,939)  
Other movements/transfers 8,940 (1,985)
Assets disposed of in the sale of Tocantinzinho 2,964  
Disposals 5,627 3,880
Depreciation for the year (127,795) (132,735)
Ending balance (1,276,626) (1,155,423)
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
Assets disposed of in the sale of Tocantinzinho 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 (1,741,029) (1,670,076)
(Impairment) reversal 936  
Other movements/transfers 1,198 247
Assets disposed of in the sale of Tocantinzinho 0  
Disposals 1 115
Depreciation for the year (66,280) (71,315)
Ending balance (1,805,174) (1,741,029)
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
Assets disposed of in the sale of Tocantinzinho 0  
Disposals 0 0
Depreciation for the year 0 0
Ending balance $ 0 $ 0