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OTHER (EXPENSES) INCOME (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Analysis of income and expense [abstract]    
Loss on disposal of plant and equipment $ (5,344) $ (3,068)
Expense related to the premium paid for shares over the prevailing market price (2,782) 0
Write-down of mineral properties 0 (906)
Royalty income 0 1,417
Other (1,023) (510)
Other (expenses) income $ (9,149) $ (3,067)