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Consolidated Statements Of Income/(Loss) And Comprehensive Income/(Loss) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Consolidated Statements Of Income/(Loss) And Comprehensive Income/(Loss) [Abstract]    
Revenues $ 0 $ 0
Operating expense:    
Exploration, property evaluation and holding costs (4,265) (3,991)
Corporate administration (3,888) (3,798)
Depreciation and amortization (694) (863)
Gain on disposal of mineral property, net (Note 4) 1,958  
Write-down of mineral property (Note 4)   (750)
Write-down of Amayapampa interest (Note 9)   (4,813)
Write-down of value-added tax receivable (572)  
Total operating expense (7,461) (14,215)
Non-operating income/(expenses):    
Gain/(loss) on sale of marketable securities 12 24
Loss on other investments (Note 3) (1,593) (4,112)
Write-down of marketable securities and long-term investments   (138)
Research and development grant, net (Note 10) 10,220  
Interest income 31 10
Interest expense   (78)
Other income/(expense) (198) (417)
Total non-operating income/(expense) 8,472 (4,711)
Income/(loss) before income taxes 1,011 (18,926)
Net income/(loss) 1,011 (18,926)
Other comprehensive income/(loss):    
Unrealized fair value increase/(decrease) on available-for-sale securities (Note 7) (46) 70
Comprehensive income/(loss) $ 965 $ (18,856)
Basic:    
Weighted average number of basic shares outstanding (in shares) 82,571,182 82,294,331
Net income/(loss) per share, Basic $ 0.01 $ (0.23)
Diluted:    
Weighted average number of diluted shares outstanding (in shares) 83,755,080 82,294,331
Net income/(loss) per share, Diluted $ 0.01 $ (0.23)