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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (USD $)
In Thousands, 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    
Increase (Decrease) in Shareholders' Equity        
Stock-based compensation 471 471    
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    
Exercise of stock options 78 78    
Exercise of stock options (in shares)   28    
Exercise of stock options from 2007 acquisition and Minera Andes Inc. 202 202    
Exercise of stock options from 2007 acquisition and Minera Andes Inc. (in shares)   35    
Shares issued for Mexico mining concessions 325 325    
Shares issued for Mexico mining concessions (in shares)   41    
Unrealized loss on marketable equity securities 597   597  
Net loss (8,734)     (8,734)
Balance at Mar. 31, 2011 271,634 610,880 854 (340,100)
Balance (in shares) at Mar. 31, 2011   139,540    
Balance at Dec. 31, 2011 219,304 613,831 (1,289) (393,238)
Balance (in shares) at Dec. 31, 2011   139,753    
Increase (Decrease) in Shareholders' Equity        
Stock-based compensation 1,573 1,573    
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    
Assumption of stock options in connection with the acquisition of Minera Andes Inc. 3,175 3,175    
Exercise of stock options 15 15    
Exercise of stock options (in shares)   17    
Exercise of stock options from 2007 acquisition and Minera Andes Inc. 2,500 2,500    
Exercise of stock options from 2007 acquisition and Minera Andes Inc. (in shares)   747    
Shares issued for Mexico mining concessions 226 226    
Shares issued for Mexico mining concessions (in shares)   42    
Unrealized loss on marketable equity securities (376)   (376)  
Net loss (19,202)     (19,202)
Balance at Mar. 31, 2012 $ 871,886 $ 1,285,991 $ (1,665) $ (412,440)
Balance (in shares) at Mar. 31, 2012   267,890