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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Operating activities:    
Net loss $ (2,712) $ (3,262)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 19 23
Amortization of right-of-use lease asset 30 30
Unrealized loss on marketable equity securities 39 142
Unrealized (gain) loss on short-term investments (49) (120)
Employee stock option expense 184 271
Loss on sale of marketable equity securities 0 159
(Gain) loss on derivative instruments (30) 4
Changes in operating assets and liabilities:   0
Property abandonment and impairment   0
Other income    
Prepaid expenses and other (199) 266
Accounts payable and other liabilities 34 299
Net cash used in operating activities (2,684) (1,948)
Investing activities:    
Sale of short-term investments, net 36 69
Purchase of mineral property 0 (386)
Purchase of other assets - net (12) (49)
Cash from sale of marketable equity securities 0 53
Sale of derivative instruments - net 31 0
Net cash provided (used in) by investing activities 55 (313)
Financing activities:    
Issuance of common stock - net of issuing costs 2,422 2,023
Stock options exercised for cash 59 20
Net cash provided by financing activities 2,481 2,043
Net increase (decrease) in cash and cash equivalents (148) (218)
Cash and cash equivalents, beginning of period 316 462
Cash and cash equivalents, end of period 168 244
Supplemental Cash Flow information:    
Acquisition of right to use asset $ 87 $ 0