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Consolidated Statements Of Income/(Loss) And Comprehensive Income/(Loss) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Operating income and (expenses):        
Exploration, property evaluation and holding costs $ (755) $ (2,213) $ (3,176) $ (15,220)
Corporate administration (134) (1,060) (2,497) (4,195)
Depreciation and amortization (219) (250) (660) (792)
Total operating expense (1,108) (3,523) (6,333) (20,207)
Non-operating income and (expenses):        
Gain/(loss) on sale of marketable securities 2 (15) 24 (33)
Unrealized gain/(loss) on other investments (Note 4) (3,792) 4,547 (2,370) (42,775)
Realized gain on other investments, net (Note 4)     155  
Write-down of plant and equipment   (3,500)   (3,500)
Interest income 2 5 9 30
Interest expense   (193) (78) (399)
Other Nonoperating Income (Expense) (12) (347) (374) 63
Total non-operating income/(expense) (3,800) 497 (2,634) (46,614)
Deferred income tax benefit/(expense)   (1)   15,373
IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollinginterest (4,908) (3,026) (8,967) (66,821)
Net income/(loss) (4,908) (3,027) (8,967) (51,448)
Other comprehensive gain/(loss):        
Unrealized fair value increase/(decrease) on available-for-sale securities (40) 45 22 (320)
Comprehensive income/(loss) $ (4,948) $ (2,982) $ (8,945) $ (51,768)
Basic:        
Weighted average number of basic shares outstanding (in shares) 82,275,217 81,788,835 82,275,217 81,711,289
Net income/(loss) per share, Basic $ (0.06) $ (0.04) $ (0.11) $ (0.63)
Diluted:        
Weighted average number of diluted shares outstanding (in shares) 82,275,217 81,788,835 82,275,217 81,711,289
Net income/(loss) per share, Diluted $ (0.06) $ (0.04) $ (0.11) $ (0.63)