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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, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Operating income and (expenses):        
Exploration, property evaluation and holding costs $ (15,600) $ (27,536) $ (21,774) $ (110,859)
Corporate administration and investor relations (5,528) (8,096) (6,375) (49,635)
Depreciation and amortization (1,021) (589) (420) (3,419)
Loss on extinguishment of convertible notes       1,218
Gain on disposal of mineral property, net (Note 6)   2,934 77,803 79,766
Write-down of mineral property (Note 6)   (250)   (250)
Total operating income/(expense) (22,149) (33,537) 49,234 (85,615)
Non-operating income and (expenses):        
Gain/(loss) on sale of marketable securities (54) 192 459 7,995
Unrealized gain/(loss) on other investments (Note 5) (48,499) (50,363) 37,347 (61,515)
Write-down of marketable securities (Note 4) (275) (39) (158) (1,234)
Write-down of plant and equipment (Note 7) (3,500) (7,117)   (10,617)
Interest income 36 45 49 2,814
Interest expense (547)   (120) (4,659)
Other income/(expense) 127 16 257 (1,847)
Total non-operating income/(expense) (52,712) (57,266) 37,834 (69,063)
Income/(loss) from continuing operations before income taxes (74,861) (90,803) 87,068 (154,678)
Deferred income tax benefit/(expense) 15,373 20,147 (35,522) (2)
Income/(loss) from continuing operations after income taxes (59,488) (70,656) 51,546 (154,680)
Loss from discontinued operations       (5,192)
Net income/(loss) (59,488) (70,656) 51,546 (159,872)
Other comprehensive income/(loss):        
Unrealized fair value increase/(decrease) on available-for-sale securities (61) (173) 754 (59)
Comprehensive income/(loss) $ (59,549) $ (70,829) $ 52,300 $ (159,931)
Basic:        
Weighted average number of basic shares outstanding (in shares) 81,813,386 74,351,065 68,457,885  
Net income/(loss) per share (in dollars per share) $ (0.73) $ (0.95) $ 0.75  
Diluted:        
Weighted average number of diluted shares outstanding (in shares) 81,813,386 74,351,065 69,295,947  
Net income/(loss) per share (in dollars per share) $ (0.73) $ (0.95) $ 0.74