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Condensed Consolidated Statements Of Income/(Loss) And Comprehensive Income/(Loss) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended 141 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Operating income and (expenses):          
Exploration, property evaluation and holding costs $ (2,213) $ (6,294) $ (15,220) $ (18,759) $ (110,479)
Corporate administration and investor relations (1,060) (1,739) (4,195) (5,816) (48,302)
Depreciation and amortization (250) (132) (792) (391) (3,190)
Loss on extinguishment of convertible debt         (1,218)
Gain/(loss) on currency translation (246) 183 126 100 (104)
Gain/(loss) on disposal of mineral property, net   1,000   1,934 79,766
Write-down of mineral property         (250)
Total operating income/(expense) (3,523) (7,165) (20,207) (23,032) (83,673)
Non-operating income and (expenses):          
Gain/(loss) on sale of marketable securities (15) 1 (33) 145 8,016
Unrealized gain/(loss) on other investments (Note 5) 4,547 29,132 (42,775) (13,184) (55,791)
Write down of marketable securities         (959)
Write-down of plant and equipment (3,500)   (3,500)   (10,617)
Interest income 5 11 30 32 2,808
Interest expense (193)   (399)   (4,511)
Other income/(expense) 101 (32) 63 (204) 1,807
Total non-operating income/(expense) 497 29,359 (46,614) (12,703) (62,965)
Income/(loss) from continuing operations before income taxes (3,026) 22,194 (66,821) (35,735) (146,638)
Deferred income tax benefit/(expense) (1) (9,925) 15,373 6,276 (2)
Income/(loss) from continuing operations after income taxes (3,027) 12,269 (51,448) (29,459) (146,640)
Loss from discontinued operations         (5,192)
Net income/(loss) (3,027) 12,269 (51,448) (29,459) (151,832)
Other comprehensive income/(loss):          
Unrealized fair value increase/(decrease) on available-for-sale securities 45 70 (320) (156) (318)
Comprehensive income/(loss) $ (2,982) $ 12,339 $ (51,768) $ (29,615) $ (152,150)
Basic:          
Weighted average number of shares outstanding (in shares) 81,788,835 75,859,161 81,711,289 73,183,166  
Net income/(loss) per share (in dollars per share) $ (0.04) $ 0.16 $ (0.63) $ (0.40)  
Diluted:          
Weighted average number of shares outstanding (in shares) 81,788,835 76,725,177 81,711,289 73,183,166  
Net income/(loss) per share (in dollars per share) $ (0.04) $ 0.16 $ (0.63) $ (0.40)