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OTHER (EXPENSES) INCOME (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Analysis of income and expense [abstract]    
Loss on disposal of plant and equipment $ (3,068) $ (4,018)
Write-down of held for sale asset 0 (2,466)
Write-down of mineral properties (906) 0
Royalty income 1,417 604
Other (510) 70
Other (expenses) income $ (3,067) $ (5,810)