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INCOME TAXES - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Current deferred tax assets    
Inventories $ 1,812 $ 2,148
Short-term investments 209 1,216
Total current deferred tax assets 2,021 3,364
Non-current deferred tax assets    
Operating loss carry forwards 80,290 74,644
Capital loss carry forwards 14,903 15,286
Deferred revenue and other 3,622 3,695
Mineral properties and deferred costs 28,317 28,080
Asset retirement obligations 5,062 4,844
Intangibles and other 0 (663)
Property, plant and equipment 1,549 845
Total non-current deferred tax assets 133,743 126,731
Subtotal deferred tax asset 135,764 130,095
Less: valuation allowance (135,764) (130,095)
Net deferred tax asset $ 0 $ 0