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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Costs, expenses and other    
Exploration expense $ 1,198 $ 413
Depreciation and amortization 27 25
Mineral property impairment 17 6
General and administrative 952 1,044
Total costs, expenses and other 2,194 1,488
Other (expense) income    
Interest and dividend income (net) 123 184
Other income 10 104
Loss on derivative instruments (38) (92)
(Loss) gain on sale of marketable equity securities (248) 50
Unrealized loss on short-term investments (102) (57)
Unrealized gain on marketable equity securities 82 360
Total other income (expense) (173) 549
Net loss $ (2,367) $ (939)
Loss per common share    
basic and diluted $ (0.04) $ (0.02)
Weighted average shares outstanding    
Basic and diluted 58,709 58,116