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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

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