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CONDENSED CONSOLIDATED STATEMENTS OF INCOME/(LOSS) AND COMPREHENSIVE INCOME/(LOSS) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
CONDENSED CONSOLIDATED STATEMENTS OF INCOME/(LOSS) AND COMPREHENSIVE INCOME/(LOSS) [Abstract]        
Revenues $ 0 $ 0 $ 0 $ 0
Operating expense:        
Exploration, property evaluation and holding costs (1,308) (824) (3,060) (1,811)
Corporate administration (775) (650) (1,796) (1,738)
Depreciation and amortization (149) (134) (318) (287)
Gain on disposal of mineral property, net (Note 3)     358 150
Total operating expense (2,232) (1,608) (4,816) (3,686)
Non-operating income/(expenses):        
Gain/(loss) on other investments (Note 2) (468) 3,277 (780) 3,820
Research and development grant, net (Note 9)       744
Interest income 29 13 79 25
Other income/(expense) (11) (45) (12) 20
Total non-operating income/(expense) (450) 3,245 (713) 4,609
Net income /(loss) (2,682) 1,637 (5,529) 923
Other comprehensive income/(loss):        
Unrealized fair value increase/(decrease) on available-for-sale securities (15) 47 (21) 64
Comprehensive income/(loss) $ (2,697) $ 1,684 $ (5,550) $ 987
Basic:        
Weighted average number of basic shares outstanding (in shares) 98,196,308 82,904,132 98,045,484 82,896,560
Net income/(loss) per share, Basic (in dollars per share) $ (0.03) $ 0.02 $ (0.06) $ 0.01
Diluted:        
Weighted average number of diluted shares outstanding (in shares) 98,196,308 83,990,701 98,045,484 83,699,423
Net income/(loss) per share, Diluted (in dollars per share) $ (0.03) $ 0.02 $ (0.06) $ 0.01