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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Operating activities:    
Net loss $ (3,768) $ (2,712)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 21 19
Amortization of right of use lease asset 31 30
Unrealized (gain) loss on marketable equity securities (366) 39
Unrealized (gain) loss on short-term investments 0 (49)
Stock-based compensation expense 540 184
(Gain) on sale of marketable equity securities (54) 0
Loss (gain) on derivative instruments 43 (30)
Increase in asset retirement and reclamation liabilities 20 0
Changes in operating assets and liabilities:    
Prepaid expenses and other 171 (199)
Accounts payable and other current liabilities 12 34
Net cash used in operating activities (3,350) (2,684)
Investing activities:    
Sale of short-term investments, net 2,038 36
Purchase of mineral property (55) 0
Purchase of other assets (12) (12)
Cash from sale of marketable equity securities 54 0
Sale of derivative instruments 39 31
Net cash provided by investing activities 2,064 55
Financing activities:    
Issuance of common stock - net of issuing costs 1,218 2,422
Issuance of common stock upon exercise of stock options 54 59
Net cash provided by financing activities 1,272 2,481
Net decrease in cash and cash equivalents (14) (148)
Cash, cash equivalents and restricted cash, beginning of period 200 316
Cash, cash equivalents and restricted cash, end of period 186 168
Supplemental Cash Flow information:    
Acquisition of right to use asset $ 0 $ 87