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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Costs, expenses and other:        
Exploration expense $ 237,000 $ 44,000 $ 384,000 $ 157,000
Depreciation 7,000 7,000 12,000 13,000
General and administrative 256,000 254,000 536,000 590,000
Total costs, expenses and other 500,000 305,000 932,000 760,000
Other (loss) income        
Interest income (net) 4,000 27,000 10,000 108,000
Other income 0 44,000 10,000 44,000
(Loss) gain on derivative instruments (30,000) 5,000 (33,000) (20,000)
Gain on sale of marketable equity securities 6,000 0 19,000 25,000
Unrealized (loss) gain on marketable equity securities (148,000) 484,000 (270,000) 251,000
Total other (loss) income (168,000) 560,000 (264,000) 408,000
Net (loss) income $ (668,000) $ 255,000 $ (1,196,000) $ (352,000)
(Loss) income per common share:        
Basic $ (0.01) $ 0.00 $ (0.02) $ (0.01)
Diluted $ (0.01) $ 0.00 $ (0.02) $ (0.01)
Weighted average shares outstanding:        
Basic 58,431 58,116 58,342 58,123
Diluted 58,431 58,249 58,342 58,123