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v3.19.1

Property, plant and equipment (Tables) | 12 Months Ended
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Dec. 31, 2018
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 and leases |  | Capitalized Evaluation |  | Total |
Cost |  |  |  |  |  |
Balance at January 1, 2017 | $ | 164,540 |  | $ | 1,416,948 |  | $ | 141,922 |  | $ | 3,877,473 |  | $ | 77,495 |  | $ | 5,678,378 |
Additions/transfers | 12,322 |  | 115,684 |  | (42,933 | ) | 254,481 |  | 9,536 |  | 349,090 |
Acquisition of Integra (note 6) | 4,820 |  | 3,646 |  | — |  | 385,181 |  | — |  | 393,647 |
Proceeds on pre-commercial production sales | — |  | — |  | — |  | (38,200 | ) | — |  | (38,200 | )
Other movements | 4,251 |  | (2,325 | ) | (12,336 | ) | 7,832 |  | — |  | (2,578 | )
Disposals | (10 | ) | (2,313 | ) | (29,832 | ) | (1,168 | ) | — |  | (33,323 | )
Balance at December 31, 2017 | $ | 185,923 |  | $ | 1,531,640 |  | $ | 56,821 |  | $ | 4,485,599 |  | $ | 87,031 |  | $ | 6,347,014 |
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 |  | 229,673 |  | 6,202 |  | 363,436 |
Proceeds on pre-commercial production sales | — |  | (9,179 | ) | — |  | (39,689 | ) | — |  | (48,868 | )
Olympias commercial production transfers (*) | 387 |  | 465,249 |  | 53,858 |  | (506,206 | ) | — |  | 13,288 |
Other movements | (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 |
Depreciation and impairment |  |  |  |  |  |
Balance at January 1, 2017 | $ | (38,635 | ) | $ | (706,641 | ) | $ | (4,733 | ) | $ | (1,282,542 | ) | $ | — |  | $ | (2,032,551 | )
Depreciation for the year | (4,245 | ) | (79,044 | ) | — |  | (2,948 | ) | — |  | (86,237 | )
Other movements | (546 | ) | (2,048 | ) | — |  | 80 |  | — |  | (2,514 | )
Disposals | — |  | 1,683 |  | — |  | 2 |  | — |  | 1,685 |
Balance at December 31, 2017 | $ | (43,426 | ) | $ | (786,050 | ) | $ | (4,733 | ) | $ | (1,285,408 | ) | $ | — |  | $ | (2,119,617 | )
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 | )
Olympias commercial production transfers (*) | — |  | (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 | )
Carrying amounts |  |  |  |  |  |
At January 1, 2017 | $ | 125,905 |  | $ | 710,307 |  | $ | 137,189 |  | $ | 2,594,931 |  | $ | 77,495 |  | $ | 3,645,827 |
At December 31, 2017 | 142,497 |  | 745,590 |  | 52,088 |  | 3,200,191 |  | 87,031 |  | 4,227,397 |
Balance at December 31, 2018 | $ | 144,270 |  | $ | 1,103,270 |  | $ | 109,361 |  | $ | 2,538,116 |  | $ | 93,459 |  | $ | 3,988,476 |
* Effective January 1, 2018, $506,206 of costs were transferred at Olympias from mineral properties and leases to relevant categories of property, plant and equipment upon commencement of commercial production.
Summary of Key Assumptions Used for Assessing Recoverable Amount of Company's CGUs Versus Carrying Values | The Company's impairment testing incorporated the following key assumptions:
Gold price ($/oz) |  | $1,250 |
Silver price ($/oz) |  | $17 |
Discount rate | 6.5 | %
The key assumptions used for assessing the recoverable amount of the Olympias carrying values as at December 31, 2018 are as follows:
Gold price ($/oz) | $1,275 - $1,300 |
Silver price ($/oz) | $17 - $18 |
Lead price ($/t) | $2,200 - $2,300 |
Zinc price ($/t) | $2,800 - $2,900 |
Discount rate | 7 | %

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