XML 151 R83.htm IDEA: XBRL DOCUMENT v3.20.1
Property, plant and equipment - Summary of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance $ 3,988,476 $ 4,227,397
Write-down of assets (6,298) (1,528)
Ending balance 4,088,202 3,988,476
Land and buildings    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 144,270 142,497
Ending balance 183,733 144,270
Plant and equipment    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 1,103,270 745,590
Ending balance 1,294,805 1,103,270
Capital works in progress    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 109,361 52,088
Ending balance 83,078 109,361
Mineral properties    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 2,538,116 3,200,191
Ending balance 2,429,879 2,538,116
Capitalized Evaluation    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 93,459 87,031
Ending balance 96,707 93,459
Cost    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 6,680,987 6,347,014
Additions/transfers 195,230 327,313
IFRS 16 transition adjustment 9,379  
Proceeds on pre-commercial production sales, net (12,159) (6,472)
Commercial production transfers 0 7,015
(Impairment) reversal (note 32) (3,578)  
Write-down of assets (1,995)  
Other movements/transfers 883 14,566
Transfer to assets held for sale (11,690)  
Disposals (7,635) (8,449)
Ending balance 6,849,422 6,680,987
Cost | Land and buildings    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 192,244 185,923
Additions/transfers 17,379 6,203
IFRS 16 transition adjustment 7,555  
Proceeds on pre-commercial production sales, net 0 0
Commercial production transfers 27,070 387
(Impairment) reversal (note 32) 0  
Write-down of assets 0  
Other movements/transfers (1,715) (240)
Transfer to assets held for sale 0  
Disposals (22) (29)
Ending balance 242,511 192,244
Cost | Plant and equipment    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 2,112,033 1,531,640
Additions/transfers 85,929 119,712
IFRS 16 transition adjustment 1,734  
Proceeds on pre-commercial production sales, net 0 (2,906)
Commercial production transfers 92,791 458,976
(Impairment) reversal (note 32) 11,690  
Write-down of assets (1,979)  
Other movements/transfers 33,335 13,011
Transfer to assets held for sale (11,690)  
Disposals (4,455) (8,400)
Ending balance 2,319,388 2,112,033
Cost | Capital works in progress    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 114,094 56,821
Additions/transfers 19,735 1,646
IFRS 16 transition adjustment 90  
Proceeds on pre-commercial production sales, net 0 0
Commercial production transfers 0 53,858
(Impairment) reversal (note 32) (15,268)  
Write-down of assets 0  
Other movements/transfers (30,103) 1,769
Transfer to assets held for sale 0  
Disposals (737) 0
Ending balance 87,811 114,094
Cost | Mineral properties    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 4,169,157 4,485,599
Additions/transfers 68,794 193,550
IFRS 16 transition adjustment 0  
Proceeds on pre-commercial production sales, net (12,159) (3,566)
Commercial production transfers (119,861) (506,206)
(Impairment) reversal (note 32) 0  
Write-down of assets 0  
Other movements/transfers (505) (200)
Transfer to assets held for sale 0  
Disposals (2,421) (20)
Ending balance 4,103,005 4,169,157
Cost | Capitalized Evaluation    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 93,459 87,031
Additions/transfers 3,393 6,202
IFRS 16 transition adjustment 0  
Proceeds on pre-commercial production sales, net 0 0
Commercial production transfers 0 0
(Impairment) reversal (note 32) 0  
Write-down of assets (16)  
Other movements/transfers (129) 226
Transfer to assets held for sale 0  
Disposals 0 0
Ending balance 96,707 93,459
Accumulated depreciation    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (2,692,511) (2,119,617)
Commercial production transfers   (13,288)
(Impairment) reversal (note 32) 100,492 (447,808)
Other movements/transfers (1,042) (16,891)
Disposals 2,065 641
Depreciation for the year (170,224) (95,548)
Ending balance (2,761,220) (2,692,511)
Accumulated depreciation | Land and buildings    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (47,974) (43,426)
Commercial production transfers   0
(Impairment) reversal (note 32) 0 (363)
Other movements/transfers (206) (1,060)
Disposals 7 0
Depreciation for the year (10,605) (3,125)
Ending balance (58,778) (47,974)
Accumulated depreciation | Plant and equipment    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (1,008,763) (786,050)
Commercial production transfers   (13,288)
(Impairment) reversal (note 32) 90,825 (105,932)
Other movements/transfers (1,049) (15,485)
Disposals 2,058 641
Depreciation for the year (107,654) (88,649)
Ending balance (1,024,583) (1,008,763)
Accumulated depreciation | Capital works in progress    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (4,733) (4,733)
Commercial production transfers   0
(Impairment) reversal (note 32) 0 0
Other movements/transfers 0 0
Disposals 0 0
Depreciation for the year 0 0
Ending balance (4,733) (4,733)
Accumulated depreciation | Mineral properties    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (1,631,041) (1,285,408)
Commercial production transfers   0
(Impairment) reversal (note 32) 9,667 (341,513)
Other movements/transfers 213 (346)
Disposals 0 0
Depreciation for the year (51,965) (3,774)
Ending balance (1,673,126) (1,631,041)
Accumulated depreciation | Capitalized Evaluation    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 0 0
Commercial production transfers   0
(Impairment) reversal (note 32) 0 0
Other movements/transfers 0 0
Disposals 0 0
Depreciation for the year 0 0
Ending balance $ 0 $ 0