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FEDERAL INCOME TAXES - Schedule of Components of Future Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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FEDERAL INCOME TAXES. |  |
Net operating loss carryforwards | $ 16,009 | $ 13,795
Mineral properties | 3,177 | 11,682
Accrued vacation | 18 | 22
Capital loss carryforwards | 22,176 | 393
Restoration reserves |  | 1,565
Capitalized transaction costs | 1,138 | 1,162
Other | 3,686 | 4,243
Deferred tax assets | 46,204 | 32,862
Valuation allowance | $ (46,204) | $ (32,862)

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