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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
REVENUE        
Income on investment in Minera Santa Cruz S.A. $ 1,595   $ 5,597  
Amortization of fair value increments (1,803)   (4,607)  
Total Revenue (208) 0 990  
COSTS AND EXPENSES        
General and administrative 4,089 2,143 8,816 3,519
Acquisition costs 47 208 1,442 208
Property holding costs 407 155 1,980 1,108
Exploration costs 10,073 10,626 21,857 17,535
Mine construction costs 6,994   8,635  
Mine operating costs 3,494   6,216  
Accretion of asset retirement obligation 120 137 232 266
Depreciation 263 139 484 259
Gain on sale of assets (128)   (130) (10)
Asset impairments 179   179  
Total costs and expenses 25,538 13,408 49,711 22,885
Operating loss (25,746) (13,408) (48,721) (22,885)
OTHER INCOME (EXPENSE)        
Interest income 57 22 182 31
Interest expense   (6)   (17)
Gain on sale of gold and silver bullion - note 4 434   1,842 524
Unrealized loss on silver bullion - note 4 (359)   (359)  
Other-than-temporary impairment on marketable equity securities - note 3 (1,993)   (1,993)  
Foreign currency gain 79 238 46 459
Total other (expense) income (1,782) 254 (282) 997
Loss before income taxes (27,528) (13,154) (49,003) (21,888)
Recovery of income taxes - note 2 6,277   8,550  
Net loss (21,251) (13,154) (40,453) (21,888)
OTHER COMPREHENSIVE LOSS        
Unrealized gain (loss) on available-for-sale securities, net of taxes 1,375 (1,463) 999 (866)
Comprehensive loss $ (19,876) $ (14,617) $ (39,454) $ (22,754)
Basic and diluted per share data:        
Net loss - basic and diluted (in dollars per share) $ (0.08) $ (0.09) $ (0.16) $ (0.16)
Weighted average common shares outstanding:        
- basic (in shares) 268,009 139,646 251,001 134,310
- diluted (in shares) 268,009 139,646 251,001 134,310