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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Operating activities:    
Net loss $ (3,324) $ (3,768)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 22 21
Amortization of right of use lease asset 30 31
Stock-based compensation expense 364 540
Realized and unrealized gain on marketable equity securities (666) (420)
Loss on derivative instruments 336 43
Increase in asset retirement and reclamation liabilities 0 20
Changes in operating assets and liabilities:    
Prepaid expenses and other (2) 171
Accounts payable and other current liabilities 176 12
Net cash used in operating activities (3,064) (3,350)
Investing activities:    
(Purchase) sale of short-term investments, net (3,050) 2,038
Purchase of mineral property (5) (55)
Purchase of other assets 0 (12)
Cash from sale of marketable equity securities 1,631 54
Cash paid for settlement of derivative instruments (403) 0
Sale of derivative instruments 0 39
Net cash (used) provided by investing activities (1,827) 2,064
Financing activities:    
Issuance of common stock - net of issuing costs 4,976 1,218
Issuance of common stock upon exercise of stock options 206 54
Net cash provided by financing activities 5,182 1,272
Net increase (decrease) in cash and cash equivalents and restricted cash 291 (14)
Cash, cash equivalents and restricted cash, beginning of period 311 200
Cash, cash equivalents and restricted cash, end of period $ 602 $ 186