FEDERAL INCOME TAXES - Schedule of Components of Future Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
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)

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

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