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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 6 Months Ended 138 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Operating income and (expenses):          
Exploration, property evaluation and holding costs $ (5,877) $ (6,758) $ (13,007) $ (12,465) $ (108,266)
Corporate administration and investor relations (1,225) (2,003) (3,135) (4,077) (47,242)
Depreciation and amortization (267) (132) (542) (258) (2,940)
Loss on extinguishment of convertible debt         (1,218)
Gain/(loss) on currency translation 793 (60) 372 (84) 142
Gain/(loss) on disposal of mineral property, net       934 79,766
Write-down of mineral property         (250)
Total operating income/(expense) (6,576) (8,953) (16,312) (15,950) (80,008)
Non-operating income and (expenses):          
Gain/(loss) on sale of marketable securities (24)   (18) 143 8,031
Unrealized gain/(loss) on other investments (Note 5) (18,541) (34,951) (47,322) (42,316) (60,338)
Write down of marketable securities         (959)
Write-down of plant and equipment         (7,117)
Interest income 12 8 25 21 2,803
Interest expense (200)   (206)   (4,318)
Other income/(expense) 97 (182) (38) (173) 1,706
Total non-operating income/(expense) (18,850) (34,761) (47,483) (41,979) (63,604)
Income/(loss) from continuing operations before income taxes (25,426) (43,714) (63,795) (57,929) (143,612)
Deferred income tax benefit/(expense) 4,411 13,210 15,374 16,201 (1)
Income/(loss) from continuing operations after income taxes (21,015) (30,504) (48,421) (41,728) (143,613)
Loss from discontinued operations         (5,192)
Net income/(loss) (21,015) (30,504) (48,421) (41,728) (148,805)
Other comprehensive income/(loss):          
Unrealized fair value increase/(decrease) on available-for-sale securities (145) (23) (365) (83) (363)
Comprehensive income/(loss) $ (21,160) $ (30,527) $ (48,786) $ (41,811) $ (149,168)
Basic:          
Weighted average number of shares outstanding (in shares) 81,745,476 72,112,543 81,671,873 71,830,466  
Net income/(loss) per share (in dollars per share) $ (0.26) $ (0.42) $ (0.59) $ (0.58)  
Diluted:          
Weighted average number of shares outstanding (in shares) 81,745,476 72,112,543 81,671,873 71,830,466  
Net income/(loss) per share (in dollars per share) $ (0.26) $ (0.42) $ (0.59) $ (0.58)