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Condensed Consolidated Statements Of Income/(Loss) And Comprehensive Income/(Loss) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended 132 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Operating income and (expenses):        
Exploration, property evaluation and holding costs $ (27,536) $ (21,774) $ (13,447) $ (95,259)
Corporate administration and investor relations (8,096) (6,375) (4,283) (44,107)
Depreciation and amortization (589) (420) (288) (2,398)
Loss on extinguishment of convertible notes     1,633 1,218
Gain/(loss) on currency translation (176) 109 112 (230)
Gain/(loss) on disposal of mineral property, net (Note 4 and 5) 2,934 77,803   79,766
Write-down of mineral property (250)     (250)
Total operating income/(expense) (33,713) 49,343 (19,539) (63,696)
Non-operating income and (expenses):        
Gain/(loss) on sale of marketable securities 192 459 281 8,049
Unrealized gain/(loss) on other investments (Note 4) (50,363) 37,347   (13,016)
Write down of marketable securities (39) (158)   (959)
Write-down of plant and equipment (7,117)     (7,117)
Interest income 45 49 131 2,778
Interest expense   (120) (1,061) (4,112)
Other income/(expense) 192 148 168 (1,744)
Total non-operating income/(expense) (57,090) 37,725 (481) (16,121)
Income/(loss) from continuing operations before income taxes (90,803) 87,068 (20,020) (79,817)
Deferred income tax benefit/(expense) 20,147 (35,522)   (15,375)
Income/(loss) from continuing operations after income taxes (70,656) 51,546 (20,020) (95,192)
Loss from discontinued operations       (5,192)
Net income/(loss) (70,656) 51,546 (20,020) (100,384)
Other comprehensive income/(loss):        
Unrealized fair value increase/(decrease) on available-for-sale securities (173) 754 252 2
Comprehensive income/(loss) $ (70,829) $ 52,300 $ (19,768) $ (100,382)
Basic:        
Weighted average number of basic shares outstanding (in shares) 74,351,065 68,457,885 47,335,571  
Net income/(loss) per share (in dollars per share) $ (0.95) $ 0.75 $ (0.42)  
Diluted:        
Weighted average number of diluted shares outstanding (in shares) 74,351,065 69,295,947 47,335,571  
Net income/(loss) per share (in dollars per share) $ (0.95) $ 0.74 $ (0.42)