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v3.20.1

Property, plant and equipment (Tables) | 12 Months Ended
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Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [abstract] |
Summary of Property, Plant and Equipment |
| Land and buildings |  | Plant and equipment |  | Capital works in progress |  | Mineral properties |  | Capitalized Evaluation |  | Total |
Cost |  |  |  |  |  |
Balance at January 1, 2018 | $ | 185,923 |  | $ | 1,531,640 |  | $ | 56,821 |  | $ | 4,485,599 |  | $ | 87,031 |  | $ | 6,347,014 |
Additions/transfers | 6,203 |  | 119,712 |  | 1,646 |  | 193,550 |  | 6,202 |  | 327,313 |
Proceeds on pre-commercial production sales, net | — |  | (2,906 | ) | — |  | (3,566 | ) | — |  | (6,472 | )
Commercial production transfers (1) | 387 |  | 458,976 |  | 53,858 |  | (506,206 | ) | — |  | 7,015 |
Other movements/transfers | (240 | ) | 13,011 |  | 1,769 |  | (200 | ) | 226 |  | 14,566 |
Disposals | (29 | ) | (8,400 | ) | — |  | (20 | ) | — |  | (8,449 | )
Balance at December 31, 2018 | $ | 192,244 |  | $ | 2,112,033 |  | $ | 114,094 |  | $ | 4,169,157 |  | $ | 93,459 |  | $ | 6,680,987 |
Additions/transfers | $ | 17,379 |  | $ | 85,929 |  | $ | 19,735 |  | $ | 68,794 |  | $ | 3,393 |  | $ | 195,230 |
IFRS 16 transition adjustment | 7,555 |  | 1,734 |  | 90 |  | — |  | — |  | 9,379 |
Proceeds on pre-commercial production sales, net | — |  | — |  | — |  | (12,159 | ) | — |  | (12,159 | )
Commercial production transfers (2) | 27,070 |  | 92,791 |  | — |  | (119,861 | ) | — |  | — |
(Impairment) reversal (note 32) | — |  | 11,690 |  | (15,268 | ) | — |  | — |  | (3,578 | )
Write-down of assets | — |  | (1,979 | ) | — |  | — |  | (16 | ) | (1,995 | )
Other movements/transfers | (1,715 | ) | 33,335 |  | (30,103 | ) | (505 | ) | (129 | ) | 883 |
Transfer to assets held for sale | — |  | (11,690 | ) | — |  | — |  | — |  | (11,690 | )
Disposals | (22 | ) | (4,455 | ) | (737 | ) | (2,421 | ) | — |  | (7,635 | )
Balance at December 31, 2019 | $ | 242,511 |  | $ | 2,319,388 |  | $ | 87,811 |  | $ | 4,103,005 |  | $ | 96,707 |  | $ | 6,849,422 |
Accumulated depreciation |  |  |  |  |  |
Balance at January 1, 2018 | $ | (43,426 | ) | $ | (786,050 | ) | $ | (4,733 | ) | $ | (1,285,408 | ) | $ | — |  | $ | (2,119,617 | )
Depreciation for the year | (3,125 | ) | (88,649 | ) | — |  | (3,774 | ) | — |  | (95,548 | )
Commercial production transfers (1) | — |  | (13,288 | ) | — |  | — |  | — |  | (13,288 | )
Other movements | (1,060 | ) | (15,485 | ) | — |  | (346 | ) | — |  | (16,891 | )
Impairment | (363 | ) | (105,932 | ) | — |  | (341,513 | ) | — |  | (447,808 | )
Disposals | — |  | 641 |  | — |  | — |  | — |  | 641 |
Balance at December 31, 2018 | $ | (47,974 | ) | $ | (1,008,763 | ) | $ | (4,733 | ) | $ | (1,631,041 | ) | $ | — |  | $ | (2,692,511 | )
Depreciation for the year | $ | (10,605 | ) | $ | (107,654 | ) | $ | — |  | $ | (51,965 | ) | $ | — |  | $ | (170,224 | )
Impairment reversal | — |  | 90,825 |  | — |  | 9,667 |  | — |  | 100,492 |
Other movements | (206 | ) | (1,049 | ) | — |  | 213 |  | — |  | (1,042 | )
Disposals | 7 |  | 2,058 |  | — |  | — |  | — |  | 2,065 |
Balance at December 31, 2019 | $ | (58,778 | ) | $ | (1,024,583 | ) | $ | (4,733 | ) | $ | (1,673,126 | ) | $ | — |  | $ | (2,761,220 | )
Carrying amounts |  |  |  |  |  |
At January 1, 2018 | $ | 142,497 |  | $ | 745,590 |  | $ | 52,088 |  | $ | 3,200,191 |  | $ | 87,031 |  | $ | 4,227,397 |
At December 31, 2018 | 144,270 |  | 1,103,270 |  | 109,361 |  | 2,538,116 |  | 93,459 |  | 3,988,476 |
Balance at December 31, 2019 | $ | 183,733 |  | $ | 1,294,805 |  | $ | 83,078 |  | $ | 2,429,879 |  | $ | 96,707 |  | $ | 4,088,202 |
Summary of Key Assumptions Used for Assessing Recoverable Amount of Company's CGUs Versus Carrying Values |
| 2019 |  | 2018 |
Gold price ($/oz) |  | $1,400 |  | $1,275 - 1,300 |
Silver price ($/oz) |  | $18 |  | $17 - 18 |
Lead price ($/t) |  | $2,100 |  | $2,200 - 2,300 |
Zinc price ($/t) |  | $2,400 |  | $2,800 - 2,900 |
Discount rate | 6.0 | % | 7.0 | %
Average factor to convert contained mineral resource ounces outside of reserves to ounces used in value beyond proven and probable calculations | 27 | % | 27 | %
Fair value per contained ounce of resources and exploration potential beyond proven and probable reserves | $130 | $100
| 2019 |  | 2018 |
Gold price ($/oz) |  | $1,400 |  |  | $1,250 |
Silver price ($/oz) |  | $18 |  |  | $17 |
Discount rate | 5.0 | % | 6.5 | %
Average factor to convert contained mineral resource ounces outside of reserves to ounces used in value beyond proven and probable calculations | 69 | % | 32 | %
Fair value per contained ounce of resources and exploration potential beyond proven and probable reserves |  | $110 |  |  | $50 |

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