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INCOME TAXES - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current deferred tax assets      
Deferred revenue $ 0 $ 0 $ 948
Inventories 2,900 1,415 1,677
Short-term investments 413 408 188
Total current deferred tax assets 3,313 1,823 2,813
Non-current deferred tax assets      
Operating loss carry forwards 91,441 86,807 60,012
Capital loss carry forwards 21,322 21,297 21,507
Deferred revenue and other 3,885 3,987 1,719
Mineral properties and deferred costs 40,581 41,631 23,632
Asset retirement obligations 6,398 3,226 2,138
Intangibles and other (2,524) (3,772) (2,134)
Property, plant and equipment (751) (1,348) 9,547
Total non-current deferred tax assets 160,352 151,828 116,421
Subtotal deferred tax asset 163,665 153,651 119,234
Less: valuation allowance (163,665) (153,651) (119,234)
Net deferred tax asset $ 0 $ 0 $ 0