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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) [Abstract]        
Revenues     $ 0 $ 0
Operating expense:        
Exploration, property evaluation and holding costs $ (960) $ (1,635) $ (3,560) $ (4,695)
Type of Cost, Good or Service [Extensible List]     us-gaap:MineralExplorationMember us-gaap:MineralExplorationMember
Corporate administration (969) (823) $ (3,280) $ (2,619)
Depreciation and amortization (12) (137) (252) (455)
Gain on disposal of mineral property, net (Note 4)       358
Total operating expense (1,941) (2,595) (7,092) (7,411)
Non-operating income/(expenses):        
(Loss)/gain on other investments (Note 3) (274) (78) 1,754 (858)
Interest income 72 38 322 117
Other income/(expense) 81 (20) 83 (32)
Total non-operating income/(expense) (121) (60) 2,159 (773)
Net loss (2,062) (2,655) (4,933) (8,184)
Other comprehensive loss:        
Unrealized fair value increase/ (decrease) on available-for-sale securities   1   (20)
Comprehensive loss $ (2,062) $ (2,654) $ (4,933) $ (8,204)
Basic:        
Weighted average number of shares outstanding (in shares) 99,805,266 98,993,395 99,600,267 98,363,761
Net loss per share, Basic (in dollars per share) $ (0.02) $ (0.03) $ (0.05) $ (0.08)
Diluted:        
Weighted average number of shares outstanding (in shares) 99,805,266 98,993,395 99,600,267 98,363,761
Net loss per share, Diluted (in dollars per share) $ (0.02) $ (0.03) $ (0.05) $ (0.08)