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Financial instruments (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of fair value measurement [Abstract] |
Disclosure of fair value measurement of assets | As at December 31, 2018, the Company’s financial assets and liabilities that are measured and recognized at fair value on a recurring basis are categorized as follows:
|  | As at December 31, 2018 |  |  | As at December 31, 2017 |
|  | Level 1 |  |  | Level 2 |  |  | Level 1 |  |  | Level 2 |
|  | $ |  |  | $ |  |  | $ |  |  | $ |
Long-term investments (Note 7) |  | 4,155 |  |  | — |  |  | 9,744 |  |  | — |
Fuel derivative contracts (Note 14) |  | — |  |  | (1,837 | ) |  | — |  |  | 7,366 |
Interest rate swaps (Note 14) |  | — |  |  | 740 |  |  | — |  |  | 1,246 |
Convertible senior subordinated notes (Note 10) |  | — |  |  | — |  |  | — |  |  | (277,650 | )
Gold forward contracts (Note 14) |  | — |  |  | — |  |  | — |  |  | (4,952 | )
Disclosure of fair value measurement of liabilities | As at December 31, 2018, the Company’s financial assets and liabilities that are measured and recognized at fair value on a recurring basis are categorized as follows:
|  | As at December 31, 2018 |  |  | As at December 31, 2017 |
|  | Level 1 |  |  | Level 2 |  |  | Level 1 |  |  | Level 2 |
|  | $ |  |  | $ |  |  | $ |  |  | $ |
Long-term investments (Note 7) |  | 4,155 |  |  | — |  |  | 9,744 |  |  | — |
Fuel derivative contracts (Note 14) |  | — |  |  | (1,837 | ) |  | — |  |  | 7,366 |
Interest rate swaps (Note 14) |  | — |  |  | 740 |  |  | — |  |  | 1,246 |
Convertible senior subordinated notes (Note 10) |  | — |  |  | — |  |  | — |  |  | (277,650 | )
Gold forward contracts (Note 14) |  | — |  |  | — |  |  | — |  |  | (4,952 | )
Disclosure of liquidity risk | As at December 31, 2018, the Company’s significant commitments are disclosed in the table below. In addition, significant commitments are disclosed in Note 10 for debt repayments and Note 21 for capital expenditure commitments.
| 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023 |  | Total |
| $ |  | $ |  | $ |  | $ |  | $ |  | $ |
Accounts payable and accrued liabilities | 80,318 |  | — |  | — |  | — |  | — |  | 80,318 |
Derivative liabilities | 360 |  | 1,477 |  | — |  | — |  | — |  | 1,837 |
Revolving credit facility: |  |  |  |  |  |
Principal | — |  | — |  | 400,000 |  | — |  | — |  | 400,000 |
Interest & commitment fees (estimated) | 21,731 |  | 21,731 |  | 11,287 |  | — |  | — |  | 54,749 |
Fekola equipment loan facility: |  |  |  |  |  |
Principal | 15,869 |  | 15,869 |  | 15,869 |  | 9,397 |  | 1,630 |  | 58,634 |
Interest (estimated) | 2,764 |  | 1,946 |  | 1,119 |  | 377 |  | 72 |  | 6,278 |
Otjikoto equipment loan facility: |  |  |  |  |  |
Principal | 4,869 |  | 3,453 |  | 1,958 |  | 642 |  | — |  | 10,922 |
Interest (estimated) | 428 |  | 234 |  | 84 |  | 12 |  | — |  | 758 |
Masbate equipment loan facility: |  |  |  |  |  |
Principal | 3,347 |  | 3,347 |  | 3,347 |  | 2,908 |  | 577 |  | 13,526 |
Interest (estimated) | 787 |  | 570 |  | 363 |  | 142 |  | 9 |  | 1,871 |
Finance lease obligations |  |  |  |  |  |
Principal | 525 |  | 525 |  | 525 |  | 525 |  | 86 |  | 2,186 |
Interest (estimated) | 62 |  | 45 |  | 28 |  | 12 |  | — |  | 147 |
Nicaraguan equipment loans: |  |  |  |  |  |
Principal | 398 |  | — |  | — |  | — |  | — |  | 398 |
Interest (estimated) | 9 |  | — |  | — |  | — |  | — |  | 9 |
| 131,467 |  | 49,197 |  | 434,580 |  | 14,015 |  | 2,374 |  | 631,633 |
Operating lease commitments | 3,072 |  | 1,994 |  | 1,629 |  | 1,046 |  | 681 |  | 8,422 |
Capital expenditure commitments | 21,085 |  | — |  | — |  | — |  | — |  | 21,085 |
Mine restoration provision | 3,170 |  | 2,268 |  | 3,711 |  | 6,321 |  | 5,668 |  | 21,138 |
Employee future benefits | 1,184 |  | 3,097 |  | 248 |  | 248 |  | 248 |  | 5,025 |
Other liabilities | 302 |  | 302 |  | 302 |  | 160 |  | — |  | 1,066 |
| 160,280 |  | 56,858 |  | 440,470 |  | 21,790 |  | 8,971 |  | 688,369 |

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