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CONSOLIDATED STATEMENTS OF INCOME/(LOSS) AND COMPREHENSIVE INCOME/(LOSS) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended 121 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
Operating income and (expenses):        
Exploration, property evaluation and holding costs $ (21,774) $ (13,447) $ (6,883) $ (58,124)
Corporate administration and investor relations (6,375) (4,283) (4,595) (32,947)
Depreciation and amortization (420) (288) (262) (1,340)
Gain/(loss) on extinguishment of convertible debt 0 (1,633) 415 (1,218)
Gain/(loss) on currency translation 109 112 118 (54)
Gain/(loss) on disposal of mineral property, net (Note 7) 77,803 0 (131) 79,664
Total operating income/(loss) 49,343 (19,539) (11,338) (14,019)
Non-operating income and (expenses):        
Gain/(loss) on sale of marketable securities 459 281 6,829 7,802
Unrealized gain on long-term investments (Note 7) 37,347 0 0 37,347
Write down of marketable securities (158) 0 (123) (1,007)
Interest income 49 131 104 2,812
Interest expense (120) (1,061) (1,523) (4,096)
Other income/(expense) 148 168 99 (5,108)
Total non-operating income/(loss) 37,725 (481) 5,386 37,750
Income/(loss) from continuing operations before income taxes 87,068 (20,020) (5,952) 23,731
Deferred income tax (expense) (35,522) 0 0 (35,522)
Income/(loss) from continuing operations after income taxes 51,546 (20,020) (5,952) (11,791)
Loss from discontinued operations 0 0 0 (12,863)
Net income/(loss) 51,546 (20,020) (5,952) (24,654)
Other comprehensive income/(loss), net of tax:        
Unrealized fair-value increase/(decrease) on available-for-sale securities 754 252 (4,737)  
Comprehensive income/(loss) $ 52,300 $ (19,768) $ (10,689)  
Basic:        
Weighted average number of shares outstanding (Note 14) (in shares) 68,457,885 47,335,571 37,268,400  
Income/(loss) per share (in dollars per share) $ 0.75 $ (0.42) $ (0.16)  
Diluted:        
Weighted average number of shares outstanding (Note 14) (in shares) 69,295,947 47,335,571 37,268,400  
Income/(loss) per share (in dollars per share) $ 0.74 $ (0.42) $ (0.16)