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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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
CONDENSED CONSOLIDATED STATEMENTS OF INCOME/(LOSS) AND COMPREHENSIVE INCOME/(LOSS) [Abstract]        
Revenues $ 0 $ 0 $ 0 $ 0
Operating expense:        
Exploration, property evaluation and holding costs (824) (984) (1,811) (1,959)
Corporate administration (650) (798) (1,738) (1,842)
Depreciation and amortization (134) (177) (287) (368)
Gain on disposal of mineral property, net (Note 4)     150 1,958
Total operating expense (1,608) (1,959) (3,686) (2,211)
Non-operating income/(expenses):        
Gain on sale of marketable securities       12
Gain/(loss) on other investments (Note 3) 3,277 (312) 3,820 (1,050)
Research and development grant, net (Note 10)   5,863 744 5,863
Interest income 13 2 25 3
Other income/(expense) (45) (5) 20 25
Total non-operating income 3,245 5,548 4,609 4,853
Net income 1,637 3,589 923 2,642
Other comprehensive income        
Unrealized fair value increase/(decrease) on available-for-sale securities 47 (3) 64 (27)
Comprehensive income $ 1,684 $ 3,586 $ 987 $ 2,615
Basic:        
Weighted average number of basic shares outstanding (in shares) 82,904,132 82,390,217 82,896,560 82,390,217
Net income per share, Basic $ 0.02 $ 0.04 $ 0.01 $ 0.03
Diluted:        
Weighted average number of diluted shares outstanding (in shares) 83,990,701 82,390,217 83,699,423 82,390,217
Net income per share, Diluted $ 0.02 $ 0.04 $ 0.01 $ 0.03