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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
COSTS AND EXPENSES:      
General and administrative $ 10,928 $ 5,397 $ 4,832
Property holding costs 3,464 4,358 4,194
Exploration costs 42,983 19,210 8,240
Mine construction and development costs 1,745    
Accretion of asset retirement obligation 524 515 762
Depreciation 577 454 625
(Gain) loss on sale of assets (36) (29) 526
Write-off of mineral property interests   5,878 16,580
Total costs and expenses 60,185 35,783 35,759
Operating loss (60,185) (35,783) (35,759)
OTHER INCOME (EXPENSE):      
Interest income 94 112 127
Interest expense 108 (15)  
Gain on sale of gold and silver bullion - note 3 2,075    
Unrealized loss on silver bullion - note 3 (3,394)    
Gain on sale of marketable equity securities - note 2 19    
Foreign currency (loss) gain (769) 597 1,558
Total other (expense) income (1,867) 694 1,685
Loss before income taxes (62,052) (35,089) (34,074)
Recovery of income taxes 180 1,998 6,376
Net loss (61,872) (33,091) (27,698)
OTHER COMPREHENSIVE LOSS:      
Unrealized (loss) gain on available-for-sale securities, net of taxes (1,546) 542 (4)
Comprehensive loss $ (63,418) $ (32,549) $ (27,702)
Basic and diluted per share data:      
Net loss - basic and diluted (in dollars per share) $ (0.45) $ (0.27) $ (0.25)
Weighted average common shares outstanding:      
- basic (in shares) 137,046 121,987 112,224
- diluted (in shares) 137,046 121,987 112,224