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CONSOLIDATED STATEMENTS OF INCOME/(LOSS) AND COMPREHENSIVE INCOME/(LOSS) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
CONSOLIDATED STATEMENTS OF INCOME/(LOSS) AND COMPREHENSIVE INCOME/(LOSS) [Abstract]      
Revenues $ 0 $ 0 $ 0
Operating expense:      
Exploration, property evaluation and holding costs (6,931) (4,303) (4,265)
Corporate administration (3,527) (2,944) (3,888)
Depreciation and amortization (655) (618) (694)
Gain on disposal of mineral property, net (Note 4) 358 150 1,958
Write-down of value-added tax receivable     (572)
Total operating expense (10,755) (7,715) (7,461)
Non-operating income/(expenses):      
Gain on sale of marketable securities     12
Gain/(loss) on other investments (Note 3) (1,248) 3,196 (1,593)
Research and development grant, net (Note 9)   1,295 10,220
Interest income 111 57 31
Other income/(expense) (143) 34 (198)
Total non-operating income/(expense) (1,280) 4,582 8,472
Net income (loss) (12,035) (3,133) 1,011
Other comprehensive income (loss):      
Unrealized fair value increase/(decrease) on available-for-sale securities (17) 50 (46)
Comprehensive income (loss) $ (12,052) $ (3,083) $ 965
Basic:      
Weighted average number of basic shares outstanding (in shares) 98,627,255 89,064,260 82,571,182
Net income (loss) per share, Basic (in dollars per share) $ (0.12) $ (0.04) $ 0.01
Diluted:      
Weighted average number of diluted shares outstanding (in shares) 98,627,255 89,064,260 83,755,080
Net income (loss) per share, Diluted (in dollars per share) $ (0.12) $ (0.04) $ 0.01