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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 124 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2012
Operating income and (expenses):      
Exploration, property evaluation and holding costs $ (5,707) $ (2,949) $ (63,831)
Corporate administration and investor relations (2,074) (1,098) (35,021)
Depreciation and amortization (126) (79) (1,466)
Loss on extinguishment of convertible debt 0 0 (1,218)
Loss on currency translation (24) (9) (78)
Gain on disposal of mineral property, net (Note 5) 934 0 80,598
Total operating loss (6,997) (4,135) (21,016)
Non-operating income and (expenses):      
Gain on sale of marketable securities 144 366 7,946
Unrealized gain/ (loss) on long-term investments (Note 7) (7,365) 0 29,982
Write down of marketable securities 0 0 (1,007)
Interest income 13 12 2,825
Interest expense 0 (120) (4,096)
Other expense (12) 0 (5,120)
Total non-operating loss (7,220) 258 30,530
Loss from continuing operations before income taxes (14,217) (3,877) 9,514
Deferred income tax expense 2,991 0 (32,531)
Loss from continuing operations after income taxes (11,226) (3,877) (23,017)
Loss from discontinued operations 0 0 (12,863)
Net loss (11,226) (3,877) (35,880)
Other comprehensive income, net of tax:      
Unrealized fair-value increase on available-for-sale securities (84) 276 91
Comprehensive loss $ (11,310) $ (3,601) $ (35,789)
Basic and Diluted:      
Weighted average number of shares outstanding (in shares) 71,548,388 61,920,846  
Loss per share (in dollars per share) $ (0.16) $ (0.06)