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INCOME TAXES - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets |  |
Inventories | $ 7,051 | $ 5,405
Short-term investments | 209 | 209
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent Classification [Abstract] |  |
Operating loss carry forwards | 95,060 | 88,156
Capital loss carry forwards | 843 | 852
Deferred revenue and other | 2,057 | 2,719
Mineral properties and deferred costs | 26,554 | 27,541
Asset retirement obligations | 3,455 | 5,028
Property, plant and equipment | 1,806 | 1,644
Total deferred tax assets | 137,035 | 131,554
Less: valuation allowance | (137,035) | (131,554)
Net deferred tax assets | $ 0 | $ 0

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