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INCOME TAXES - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Current deferred tax assets    
Deferred revenue $ 0 $ 0
Inventories 2,148 2,900
Short-term investments 1,216 413
Total current deferred tax assets 3,364 3,313
Non-current deferred tax assets    
Operating loss carry forwards 74,644 91,441
Capital loss carry forwards 15,286 21,322
Deferred revenue and other 3,695 3,885
Mineral properties and deferred costs 28,080 40,581
Asset retirement obligations 4,844 6,398
Intangibles and other (663) (2,524)
Property, plant and equipment 845  
Deferred Tax Liabilities, Property, Plant and Equipment   (751)
Total non-current deferred tax assets 126,731 160,352
Subtotal deferred tax asset 130,095 163,665
Less: valuation allowance (130,095) (163,665)
Net deferred tax asset $ 0 $ 0