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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Costs, expenses and other    
Exploration expense $ 2,283 $ 1,198
Depreciation and amortization 29 27
Mineral property impairment 0 17
General and administrative 1,360 952
Total costs, expenses and other 3,672 2,194
Other (expense) income    
Interest and dividend income (net) 131 123
Other income 20 10
Loss on derivative instruments (4) (38)
Loss on sale of marketable equity securities (201) (248)
Unrealized loss on short-term investments (108) (102)
Unrealized (loss) gain on marketable equity securities (94) 82
Total other income (expense) (256) (173)
Net loss $ (3,928) $ (2,367)
Loss per common share    
basic and diluted $ (0.06) $ (0.04)
Weighted average shares outstanding    
Basic and diluted 64,263 58,709