FEDERAL INCOME TAXES - Schedule of Components of Future Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
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)

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible capital loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Deferred tax assets restoration reserves noncurrent.

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