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INCOME TAXES - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Current deferred tax assets |  |
Inventories | $ 5,405 | $ 1,812
Short-term investments | 209 | 209
Total current deferred tax assets | 5,614 | 2,021
Non-current deferred tax assets |  |
Operating loss carry forwards | 88,156 | 80,290
Capital loss carry forwards | 852 | 14,903
Deferred revenue and other | 2,719 | 3,622
Mineral properties and deferred costs | 27,541 | 28,317
Asset retirement obligations | 5,028 | 5,062
Intangibles and other | 0 | 0
Property, plant and equipment | 1,644 | 1,549
Deferred Tax Assets, Gross, Noncurrent | 125,940 | 133,743
Deferred Tax Assets, Gross | 131,554 | 135,764
Less: valuation allowance | (131,554) | (135,764)
Net deferred tax asset | $ 0 | $ 0

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