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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Cash flows from operating activities:    
Net loss $ (4,931) $ (15,237)
Adjustments to reconcile net loss to net cash used in operations:    
Depreciation and amortization 45 49
Stock-based compensation 779 887
Gain on disposal of mineral property interests, net (2,883) (2,100)
Gain on other investments   (46)
Reduction of provision for environmental liability (240)  
Write-down of plant and equipment   5,500
Change in working capital account items:    
Other current assets 274 (50)
Accounts payable, accrued liabilities and other (457) 377
Net cash used in operating activities (7,413) (10,620)
Cash flows from investing activities:    
Proceeds from sales of marketable securities   339
Maturities of short-term investments, net 384 16
Additions to plant and equipment (5) (139)
Proceeds from option/sale agreements, net 2,500 2,415
Net cash provided by investing activities 2,879 2,631
Cash flows from financing activities:    
Proceeds from equity financing, net 244 13,385
Payment of taxes from withheld shares (357) (401)
Net cash provided by/(used in) financing activities (113) 12,984
Net increase/(decrease) in cash and cash equivalents (4,647) 4,995
Cash and cash equivalents, beginning of period 12,757 7,762
Cash and cash equivalents, end of period $ 8,110 $ 12,757