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FEDERAL INCOME TAXES - Schedule of Components of Future Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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FEDERAL INCOME TAXES. |  |
Net operating loss carryforwards | $ 21,016 | $ 16,009
Mineral properties | 5,017 | 3,177
Accrued vacation | 25 | 18
Capital loss carryforwards | 22,523 | 22,176
Restoration reserves | 405 |
Capitalized transaction costs | 1,157 | 1,138
Other | 3,580 | 3,686
Deferred tax assets | 53,723 | 46,204
Valuation allowance | $ (53,723) | $ (46,204)

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