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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
CONDENSED CONSOLIDATED STATEMENTS OF INCOME/(LOSS) AND COMPREHENSIVE INCOME/(LOSS)        
Revenues $ 0 $ 0 $ 0 $ 0
Operating expense:        
Exploration, property evaluation and holding costs (947) (1,055) (1,893) (2,600)
Corporate administration (1,067) (888) (2,214) (2,311)
Depreciation and amortization (14) (12) (26) (240)
Total operating expense (2,028) (1,955) (4,133) (5,151)
Non-operating income/(expense):        
(Loss)/gain on other investments (Note 3) (1,093)   (1,717) 2,028
Interest income 34 68 76 250
Other income/(expense) 43 (36) 78 2
Total non-operating income/(expense) (1,016) 32 (1,563) 2,280
Loss before income taxes (3,044) (1,923) (5,696) (2,871)
Net loss (3,044) (1,923) (5,696) (2,871)
Other comprehensive loss:        
Comprehensive loss $ (3,044) $ (1,923) $ (5,696) $ (2,871)
Basic:        
Weighted average number of shares outstanding (in shares) 100,537,541 99,547,531 100,431,813 99,496,641
Net loss per share, Basic (in dollars per share) $ (0.03) $ (0.02) $ (0.06) $ (0.03)
Diluted:        
Weighted average number of shares outstanding (in shares) 100,537,541 99,547,531 100,431,813 99,496,641
Net loss per share, Diluted (in dollars per share) $ (0.03) $ (0.02) $ (0.06) $ (0.03)