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CONDENSED CONSOLIDATED STATEMENTS OF INCOME/(LOSS) AND COMPREHENSIVE INCOME/(LOSS) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
CONDENSED CONSOLIDATED STATEMENTS OF INCOME/(LOSS) AND COMPREHENSIVE INCOME/(LOSS) [Abstract]    
Revenues $ 0 $ 0
Operating expense:    
Exploration, property evaluation and holding costs (1,752) (987)
Corporate administration (1,021) (1,088)
Depreciation and amortization (169) (153)
Gain on disposal of mineral property, net (Note 3) 358 150
Total operating expense (2,584) (2,078)
Non-operating income/(expenses):    
Gain/(loss) on other investments (Note 2) (312) 543
Research and development grant, net (Note 9)   744
Interest income 50 12
Other income/(expense) (1) 65
Total non-operating income/(expense) (263) 1,364
Net loss (2,847) (714)
Other comprehensive loss:    
Unrealized fair value increase/(decrease) on available-for-sale securities (6) 17
Comprehensive loss $ (2,853) $ (697)
Basic:    
Weighted average number of basic shares outstanding (in shares) 97,894,661 82,888,987
Net loss per share, Basic (in dollars per share) $ (0.03) $ (0.01)
Diluted:    
Weighted average number of diluted shares outstanding (in shares) 97,894,661 82,888,987
Net loss per share, Diluted (in dollars per share) $ (0.03) $ (0.01)