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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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Operating income and (expenses):        
Exploration, property evaluation and holding costs $ (1,003) $ (5,877) $ (2,421) $ (13,007)
Corporate administration (1,088) (1,225) (2,363) (3,135)
Depreciation and amortization (224) (267) (441) (542)
Total operating expense (2,315) (7,369) (5,225) (16,684)
Non-operating income and (expenses):        
Gain/(loss) on sale of marketable securities 9 (24) 22 (18)
Unrealized gain/(loss) on other investments (Note 3) (632) (18,541) 1,422 (47,322)
Realized gain on other investments, net (Note 3)     155  
Interest income 3 12 7 25
Interest expense   (200) (78) (206)
Other Nonoperating Income (Expense) 16 696 (362) 410
Total non-operating income/(expense) (604) (18,057) 1,166 (47,111)
Deferred income tax benefit/(expense)   4,411   15,374
IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollinginterest (2,919) (25,426) (4,059) (63,795)
Net income/(loss) (2,919) (21,015) (4,059) (48,421)
Other comprehensive gain/(loss):        
Unrealized fair value increase/(decrease) on available-for-sale securities 9 (145) 62 (365)
Comprehensive income/(loss) $ (2,910) $ (21,160) $ (3,997) $ (48,786)
Basic:        
Weighted average number of basic shares outstanding (in shares) 82,275,217 81,745,476 82,275,217 81,671,873
Net income/(loss) per share, Basic $ (0.04) $ (0.26) $ (0.05) $ (0.59)
Diluted:        
Weighted average number of diluted shares outstanding (in shares) 82,275,217 81,745,476 82,275,217 81,671,873
Net income/(loss) per share, Diluted $ (0.04) $ (0.26) $ (0.05) $ (0.59)