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Income Taxes (Details) - USD ($) | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Deferred tax assets: |  |
Loss carryovers | $ 11,652,000 | $ 12,148,000
Investment in mineral property | 1,669,000 | 1,669,000
Capitalized exploration costs | 778,000 | 418,000
Stock option compensation expense | 152,000 | 309,000
Unrealized loss on derivative securities | 121,000 | 98,000
Other | 65,000 | 91,000
Unrealized loss on short-term investments | 20,000 | 0
Lease liability | 9,000 | 18,000
Valuation allowance | (14,309,000) | (14,561,000)
Total deferred tax assets | 157,000 | 190,000
Deferred tax liabilities: |  |
Unrealized gains on marketable equity securities | 149,000 | 173,000
Lease asset | 8,000 | 17
Total deferred tax liabilities | 157,000 | 190,000
Net deferred tax liabilities | $ 0 | $ 0

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