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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Costs, expenses and other:        
Exploration expense $ 655 $ 442 $ 1,832 $ 826
Depreciation 7 8 23 20
General and administrative 435 207 1,099 743
Property abandonment and impairment 0 17 0 17
Total costs, expenses and other 1,097 674 2,954 1,606
Other income (loss)        
Interest income 29 34 97 100
Other income 20 0 20 10
Loss on derivative instruments 0 (1) (4) (34)
Unrealized loss on short-term investments (22) (21) (120) (77)
Loss on sale of marketable equity securities 0 (89) (159) (70)
Unrealized gain (loss) on marketable equity securities (13) (50) (142) (220)
Total other income (loss) 40 (27) (308) (291)
Net loss $ (1,057) $ (701) $ (3,262) $ (1,897)
Loss per common share:        
Basic and diluted $ (0.02) $ (0.01) $ (0.05) $ (0.03)
Weighted average shares outstanding:        
Basic and diluted 64,769 58,446 64,091 58,377