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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Costs, expenses and other:        
Exploration expense $ 951 $ 237 $ 1,177 $ 384
Depreciation 8 7 16 12
General and administrative 277 256 664 536
Total costs, expenses and other 1,236 500 1,857 932
Other (loss) income        
Interest income 41 36 68 66
Other income 0 0 0 10
Loss on derivative instruments (3) (30) (4) (33)
Unrealized loss on short-term investments (47) (32) (98) (56)
(Loss) gain on sale of marketable equity securities (78) 6 (159) 19
Unrealized loss on marketable equity securities (368) (148) (155) (270)
Total other (loss) income (455) (168) (348) (264)
Net (loss) income $ (1,691) $ (668) $ (2,205) $ (1,196)
(Loss) income per common share:        
Basic and diluted $ (0.03) $ (0.01) $ (0.03) $ (0.02)
Weighted average shares outstanding:        
Basic and diluted 64,769 58,431 63,748 58,342