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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF INCOME/(LOSS) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Operating income/(expense):    
Exploration, property evaluation and holding costs $ (1,751) $ (948)
Corporate administration (1,315) (1,376)
Depreciation and amortization (11) (12)
Total operating expense (3,077) (2,336)
Non-operating income/(expense):    
Loss on other investments (Note 3) (30) (1,129)
Interest income 1 10
Other income/(expense) 7 (45)
Total non-operating expense (22) (1,164)
Loss before income taxes (3,099) (3,500)
Net loss $ (3,099) $ (3,500)
Basic:    
Weighted average number of shares outstanding (in shares) 103,512,054 100,698,124
Net loss per share (Note 6), Basic (in dollars per share) $ (0.03) $ (0.03)
Diluted:    
Weighted average number of shares outstanding (in shares) 103,512,054 100,698,124
Net loss per share (Note 6), Diluted (in dollars per share) $ (0.03) $ (0.03)