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UNAUDITED CONSOLIDATED STATEMENTS OF INCOME/(LOSS) AND COMPREHENSIVE INCOME/(LOSS) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended 119 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Operating income and (expenses):          
Exploration, property evaluation and holding costs $ (6,758) $ (4,854) $ (12,465) $ (7,803) $ (70,589)
Corporate administration and investor relations (2,003) (1,658) (4,077) (2,757) (37,024)
Depreciation and amortization (132) (81) (258) (160) (1,598)
Loss on extinguishment of convertible debt 0 0 0 0 (1,218)
Gain/(loss) on currency translation (60) 45 (84) 36 (138)
Gain on disposal of mineral property, net (Note 5) 0 77,807 934 77,807 80,598
Total operating income/(expense) (8,953) 71,259 (15,950) 67,123 (29,969)
Non-operating income and (expenses):          
Gain on sale of marketable securities 0 81 143 447 7,945
Unrealized gain/ (loss) on long-term investments (Note 7) (34,951) 0 (42,316) 0 (4,969)
Write down of marketable securities 0 0 0 0 (1,007)
Interest income 8 14 21 26 2,833
Interest expense 0 0 0 (120) (4,096)
Other expense 182 (1) 173 0 (4,935)
Total non-operating income/(expense) (34,761) 94 (41,979) 353 (4,229)
Income/(loss) from continuing operations before income taxes (43,714) 71,353 (57,929) 67,476 (34,198)
Deferred income tax benefit/(expense) 13,210 (23,589) 16,201 (23,589) (19,321)
Income/(loss) from continuing operations after income taxes (30,504) 47,764 (41,728) 43,887 (53,519)
Loss from discontinued operations 0 0 0 0 (12,863)
Net income/(loss) (30,504) 47,764 (41,728) 43,887 (66,382)
Other comprehensive income/(loss):          
Unrealized fair-value decrease on available-for-sale securities (23) (403) (83) (127) (51)
Comprehensive income (loss) $ (30,527) $ 47,361 $ (41,811) $ 43,760 $ (66,433)
Basic:          
Weighted average number of shares outstanding (in shares) 72,112,543 69,088,613 71,830,466 65,524,530  
Net income/(loss) per share (in dollars per share) $ (0.42) $ 0.69 $ (0.58) $ 0.67  
Diluted:          
Weighted average number of shares outstanding (in shares) 72,112,543 69,536,081 71,830,466 66,193,065  
Net income/(loss) per share (in dollars per share) $ (0.42) $ 0.69 $ (0.58) $ 0.66