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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 129 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Operating income and (expenses):          
Exploration, property evaluation and holding costs $ (6,294) $ (5,803) $ (18,759) $ (13,606) $ (76,883)
Corporate administration and investor relations (1,739) (1,312) (5,816) (4,069) (38,763)
Depreciation and amortization (132) (87) (391) (247) (1,731)
Loss on extinguishment of convertible debt         (1,218)
Gain/(loss) on currency translation 183 17 100 53 46
Gain/(loss) on disposal of mineral property, net (Note 5) 1,000 (5) 1,934 77,802 81,598
Total operating income/(expense) (6,982) (7,190) (22,932) 59,933 (36,951)
Non-operating income and (expenses):          
Gain/(loss) on sale of marketable securities 1 (2) 145 445 7,947
Unrealized gain/(loss) on other investments (Note 4) 29,132 27,762 (13,184) 27,762 24,163
Write down of marketable securities         (1,007)
Interest income 11 11 32 37 2,844
Interest expense       (120) (4,096)
Other income/(expense) 32 109 204 109 (4,904)
Total non-operating income/(expense) 29,176 27,880 (12,803) 28,233 24,947
Income/(loss) from continuing operations before income taxes 22,194 20,690 (35,735) 88,166 (12,004)
Deferred income tax benefit/(expense) (9,925) (9,957) 6,276 (33,546) (29,246)
Income/(loss) from continuing operations after income taxes 12,269 10,733 (29,459) 54,620 (41,250)
Loss from discontinued operations         (12,863)
Net income/(loss) 12,269 10,733 (29,459) 54,620 (54,113)
Other comprehensive income/(loss):          
Unrealized fair value increase/(decrease) on available-for-sale securities 70 (319) (156) (446) 19
Comprehensive income/(loss) $ 12,339 $ 10,414 $ (29,615) $ 54,174 $ (54,094)
Basic:          
Weighted average number of shares outstanding (in shares) 75,859,161 71,213,543 73,183,166 67,441,707  
Net income/(loss) per share (in dollars per share) $ 0.16 $ 0.15 $ (0.40) $ 0.81  
Diluted:          
Weighted average number of shares outstanding (in shares) 76,725,177 72,781,902 73,183,166 68,202,947  
Net income/(loss) per share (in dollars per share) $ 0.16 $ 0.15 $ (0.40) $ 0.80