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Provisions and other liabilities (Tables) | 12 Months Ended
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Dec. 31, 2019
Disclosure of other provisions [abstract] |
Disclosure of other provisions [Table Text Block] |
|  |  |  |  |  |  |  |  | 2019 |  |  | 2018 |
|  |  | Restricted share units(i) |  |  | Deferred share units(i) |  |  | Environmental rehabilitation(iii) |  |  | Lease liabilities(iii) |  |  | Total |  |  | Restricted share units |  |  | Deferred share units |  |  | Total |
|  |  | $ |  |  | $ |  |  | $ |  |  | $ |  |  | $ |  |  | $ |  |  | $ |  |  | $ |
Balance - Beginning of period |  | 32 |  |  | 3,462 |  |  | - |  |  | - |  |  | 3,494 |  |  | 4,343 |  |  | 3,325 |  |  | 7,668 |
| Acquisition of Barkerville (Note 7) |  | - |  |  | - |  |  | 20,549 |  |  | - |  |  | 20,549 |  |  | - |  |  | - |  |  | - |
| Adoption of IFRS 16 (Note 4) |  | - |  |  | - |  |  | - |  |  | 10,893 |  |  | 10,893 |  |  | - |  |  | - |  |  | - |
| New liabilities |  | 11 |  |  | 416 |  |  | - |  |  | - |  |  | 427 |  |  | 1,906 |  |  | 1,323 |  |  | 3,229 |
| Accretion |  | - |  |  | - |  |  | 89 |  |  | - |  |  | 89 |  |  | - |  |  | - |  |  | - |
| Settlement of liabilities |  | (45 | ) |  | (544 | ) |  | - |  |  | (766 | ) |  | (1,355 | ) |  | (2,618 | ) |  | (499 | ) |  | (3,117 | )
| RSU to be settled in equity |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | (2,426 | ) |  | - |  |  | (2,426 | )
| DSU to be settled in equity |  | - |  |  | (3,722 | ) |  | - |  |  | - |  |  | (3,722 | ) |  | - |  |  | - |  |  | - |
| Revision of estimates |  | 2 |  |  | 388 |  |  | (111 | ) |  | - |  |  | 279 |  |  | (1,173 | ) |  | (687 | ) |  | (1,860 | )
Balance - End of period |  | - |  |  | - |  |  | 20,527 |  |  | 10,127 |  |  | 30,654 |  |  | 32 |  |  | 3,462 |  |  | 3,494 |
Current portion |  | - |  |  | - |  |  | 493 |  |  | 796 |  |  | 1,289 |  |  | 32 |  |  | 3,462 |  |  | 3,494 |
Non-current portion |  | - |  |  | - |  |  | 20,034 |  |  | 9,331 |  |  | 29,365 |  |  | - |  |  | - |  |  | - |
|  |  | - |  |  | - |  |  | 20,527 |  |  | 10,127 |  |  | 30,654 |  |  | 32 |  |  | 3,462 |  |  | 3,494 |
(i) Additional information on the Deferred Share Units ("DSU") and Restricted Share Units ("RSU") are presented in Note 21. (ii) The environmental rehabilitation provision represents the legal and contractual obligations associated with the eventual closure of the Company's mining interests, plant and equipment and exploration and evaluation assets. As at December 31, 2019, the estimated inflation-adjusted undiscounted cash flows required to settle the environmental rehabilitation amounts to $23.4 million. The weighted average actualization rate used is 4.2% and the disbursements are expected to be made between 2020 and 2024 as per the current closure plans. (iii) The lease liabilities are described in Note 4.

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