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Income Taxes (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Deferred tax assets:    
Loss carryovers $ 12,403 $ 11,652
Investment in mineral property 1,669 1,669
Capitalized exploration costs 841 778
Stock option compensation expense 129 152
Unrealized loss on derivative securities 0 121
Other 175 65
Unrealized loss on short-term investments 100 20
Lease liability 19 9
Valuation allowance (15,301) (14,309)
Total deferred tax assets 35 157
Deferred tax liabilities:    
Unrealized gains on marketable equity securities 1 149
Lease asset 21 8
Basis difference on fixed assets 13 0
Total deferred tax liabilities 35 157
Net deferred tax liabilities $ 0 $ 0