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Consolidated Statements of Operations - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Income Statement [Abstract]    
Revenue – mineral property sale $ 502
Costs, expenses and other    
Exploration expense 1,254 699
Depreciation and amortization 25 13
General and administrative 1,954 1,202
Total costs, expenses and other 3,233 1,914
Interest and dividend income (net) 192 123
Gain on sale of marketable equity securities 578
Unrealized loss on marketable equity securities (1,058)
Gain on derivative instruments 271
Loss on sale of assets (1)
Total other income (expense) (867) 972
Net loss $ 3,598 $ 942
basic and diluted $ (0.06) $ (0.02)
Weighted average shares outstanding    
Basic and diluted 58,360 47,990