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CONDENSED CONSOLIDATED STATEMENTS OF INCOME/(LOSS) AND COMPREHENSIVE INCOME/(LOSS) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
CONDENSED CONSOLIDATED STATEMENTS OF INCOME/(LOSS) AND COMPREHENSIVE INCOME/(LOSS)    
Revenues $ 0 $ 0
Operating expense:    
Exploration, property evaluation and holding costs $ (946) $ (1,545)
Type of Cost, Good or Service [Extensible List] us-gaap:MineralExplorationMember us-gaap:MineralExplorationMember
Corporate administration $ (1,147) $ (1,423)
Depreciation and amortization (12) (228)
Total operating expense (2,105) (3,196)
Non-operating income/(expense):    
(Loss)/gain on other investments (Note 3) (624) 2,028
Interest income 42 182
Other income/(expense) 35 38
Total non-operating income/(expense) (547) 2,248
Loss before income taxes (2,652) (948)
Net loss (2,652) (948)
Other comprehensive loss:    
Comprehensive loss $ (2,652) $ (948)
Basic:    
Weighted average number of shares outstanding (in shares) 100,323,736 99,445,750
Net loss per share, Basic (in dollars per share) $ (0.03) $ (0.01)
Diluted:    
Weighted average number of shares outstanding (in shares) 100,323,736 99,445,750
Net loss per share, Diluted (in dollars per share) $ (0.03) $ (0.01)