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OTHER (EXPENSES) INCOME (Tables) | 12 Months Ended
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Dec. 31, 2017
Analysis of income and expense [abstract] |
Other income (expenses) |
Years ended December 31 | 2017 |  | 2016 |
| $ |  | $ |
Loss on disposal of plant and equipment | (3,068 | ) | (4,018 | )
Write-down of held for sale asset | — |  | (2,466 | )
Write-down of mineral properties | (906 | ) | — |
Royalty income | 1,417 |  | 604 |
Other | (510 | ) | 70 |
| (3,067 | ) | (5,810 | )

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