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CONSOLIDATED STATEMENTS OF INCOME/(LOSS) AND COMPREHENSIVE INCOME/(LOSS) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Operating expense:    
Exploration, property evaluation and holding costs $ (4,093) $ (4,803)
Corporate administration (3,940) (4,072)
Depreciation and amortization (52) (983)
Write-down of plant and equipment (Note 5)   (1,000)
Total operating expense (8,085) (10,858)
Non-operating income/(expense):    
Gain/(loss) on other investments (Note 3) (1,643) 1,716
Interest income 121 368
Other income/(expense) 221 60
Total non-operating income/(expense) (1,301) 2,144
Loss before income taxes (9,386) (8,714)
Net loss (9,386) (8,714)
Other comprehensive loss:    
Comprehensive loss $ (9,386) $ (8,714)
Basic:    
Weighted average number of shares outstanding (in shares) 100,533,448 99,738,461
Net loss per share, Basic (in dollars per share) $ (0.09) $ (0.09)
Diluted:    
Weighted average number of shares outstanding (in shares) 100,533,448 99,738,461
Net loss per share, Diluted (in dollars per share) $ (0.09) $ (0.09)