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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (USD $)
In Thousands, except Share data, unless otherwise specified
Total
Common Stock
Accumulated Other Comprehensive Loss
Accumulated Deficit
Balance at Dec. 31, 2010 $ 173,280 $ 504,389 $ 257 $ (331,366)
Balance (in shares) at Dec. 31, 2010   122,186,000    
Increase (Decrease) in Shareholders' Equity        
Stock-based compensation 1,905 1,905    
Sale of shares for cash, net of issuance costs 105,415 105,415    
Sale of shares for cash, net of issuance costs (in shares)   17,250,000    
Exercise of stock options 412 412    
Exercise of stock options (in shares)   163,000    
Exercise of stock options from 2007 acquisition and Minera Andes Inc. 361 361    
Exercise of stock options from 2007 acquisition and Minera Andes Inc. (in shares)   70,000    
Shares issued for Mexico mining concessions 582 582    
Shares issued for Mexico mining concessions (in shares)   84,000    
Unrealized loss on marketable equity securities (777)   (777)  
Net loss (45,568)     (45,568)
Balance at Sep. 30, 2011 235,610 613,064 (520) (376,934)
Balance (in shares) at Sep. 30, 2011   139,753,000    
Balance at Dec. 31, 2011 219,304 613,831 (1,289) (393,238)
Balance (in shares) at Dec. 31, 2011   139,753,000    
Increase (Decrease) in Shareholders' Equity        
Stock-based compensation 2,845 2,845    
Issuance of exchangeable shares to acquire Minera Andes Inc. 664,671 664,671    
Issuance of exchangeable shares to acquire Minera Andes Inc. (in shares)   127,331,000    
Assumption of stock options in connection with the acquisition of Minera Andes Inc. 3,175 3,175    
Exercise of stock options 721 721    
Exercise of stock options (in shares) 1,300,000 387,000    
Exercise of stock options from 2007 acquisition and Minera Andes Inc. 2,844 2,844    
Exercise of stock options from 2007 acquisition and Minera Andes Inc. (in shares)   942,000    
Shares issued for Mexico mining concessions 391 391    
Shares issued for Mexico mining concessions (in shares) 83,000 83,000    
Unrealized loss on marketable equity securities (2)   (2)  
Reclassification of unrealized loss on marketable equity securities disposed of during the period, net of tax (993)   (993)  
Other-than-temporary impairment on marketable equity securities 1,993   1,993  
Net loss (40,578)     (40,578)
Balance at Sep. 30, 2012 $ 854,371 $ 1,288,478 $ (291) $ (433,816)
Balance (in shares) at Sep. 30, 2012   268,496,000