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CONSOLIDATED STATEMENTS OF INCOME/(LOSS) AND COMPREHENSIVE INCOME/(LOSS) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
CONSOLIDATED STATEMENTS OF INCOME/(LOSS) AND COMPREHENSIVE INCOME/(LOSS)    
Revenues $ 0 $ 0
Operating expense:    
Exploration, property evaluation and holding costs $ (4,803) $ (6,931)
Type of Cost, Good or Service [Extensible List] us-gaap:MineralExplorationMember us-gaap:MineralExplorationMember
Corporate administration $ (4,072) $ (3,527)
Depreciation and amortization (983) (655)
Write-down of plant and equipment (Note 5) (1,000)  
Gain on disposal of mineral properties, net (Note 4)   358
Total operating expense (10,858) (10,755)
Non-operating income/(expense):    
(Loss)/gain on other investments (Note 3) 1,716 (1,248)
Interest income 368 111
Other income/(expense) 60 (143)
Total non-operating income/(expense) 2,144 (1,280)
Loss before income taxes (8,714) (12,035)
Net loss (8,714) (12,035)
Other comprehensive loss:    
Unrealized fair value increase/ (decrease) on available-for-sale securities   (17)
Comprehensive loss $ (8,714) $ (12,052)
Basic:    
Weighted average number of shares outstanding (in shares) 99,738,461 98,627,255
Net loss per share, Basic (in dollars per share) $ (0.09) $ (0.12)
Diluted:    
Weighted average number of shares outstanding (in shares) 99,738,461 98,627,255
Net loss per share, Diluted (in dollars per share) $ (0.09) $ (0.12)