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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Operating activities:    
Net loss $ 3,262 $ 1,897
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 23 20
Amortization of right of use lease asset 30 30
Unrealized loss on marketable equity securities 142 220
Unrealized loss on short-term investments 120 100
Employee stock option expense 271 104
Gain on sale of marketable equity securities 159 70
Loss on derivative instruments 4 34
Property abandonment and impairment 0 17
Other income 0 (10)
Changes in operating assets and liabilities:    
Prepaid expenses and other assets 266 (381)
Accounts payable and other liabilities 299 (30)
Net cash used in operating activities (1,948) (1,723)
Investing activities:    
Sale of short-term investments, net 69 1,837
Purchase of mineral property (386) (458)
Purchase of other assets - net (49) (39)
Cash from sale of marketable equity securities 53 104
Sale of derivative instruments - net 0 (8)
Net cash (used in) provided by investing activities (313) 1,452
Financing activities:    
Issuance of common stock - net of acquisition costs 2,023 137
Stock options exercised for cash 20 83
Net cash provided by financing activities 2,043 220
Net decrease in cash and cash equivalents (218) (51)
Cash and cash equivalents, beginning of period 462 605
Cash and cash equivalents, end of period 244 554
Supplemental Cash Flow information:    
Accrued mineral property acquisition costs included in accounts payable 0 60
Acquisition of right to use asset $ 0 $ 99