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CONSOLIDATED STATEMENTS OF INCOME/(LOSS) AND COMPREHENSIVE INCOME/(LOSS) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
CONSOLIDATED STATEMENTS OF INCOME/(LOSS) AND COMPREHENSIVE INCOME/(LOSS) [Abstract]      
Revenues $ 0 $ 0 $ 0
Operating expense:      
Exploration, property evaluation and holding costs (4,303) (4,265) (3,991)
Corporate administration (2,944) (3,888) (3,798)
Depreciation and amortization (618) (694) (863)
Gain on disposal of mineral property, net (Note 4) 150 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 (7,715) (7,461) (14,215)
Non-operating income/(expenses):      
Gain on sale of marketable securities   12 24
Gain/(loss) on other investments (Note 3) 3,196 (1,593) (4,112)
Write-down of marketable securities and long-term investments     (138)
Research and development grant, net (Note 10) 1,295 10,220  
Interest income 57 31 10
Interest expense     (78)
Other income/(expense) 34 (198) (417)
Total non-operating income/(expense) 4,582 8,472 (4,711)
Net income/(loss) (3,133) 1,011 (18,926)
Other comprehensive income (loss):      
Unrealized fair value increase/(decrease) on available-for-sale securities 50 (46) 70
Comprehensive income/(loss) $ (3,083) $ 965 $ (18,856)
Basic:      
Weighted average number of basic shares outstanding (in shares) 89,064,260 82,571,182 82,294,331
Net income/(loss) per share, Basic $ (0.04) $ 0.01 $ (0.23)
Diluted:      
Weighted average number of diluted shares outstanding (in shares) 89,064,260 83,755,080 82,294,331
Net income/(loss) per share, Diluted $ (0.04) $ 0.01 $ (0.23)