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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 1,222 1,222    
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 325 325    
Shares issued for Mexico mining concessions (in shares)   42,000    
Unrealized loss on marketable equity securities (866)   (866)  
Net loss (21,888)     (21,888)
Balance at Jun. 30, 2011 258,261 612,124 (609) (353,254)
Balance (in shares) at Jun. 30, 2011   139,711,000    
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 2,135 2,135    
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 594 594    
Exercise of stock options (in shares) 1,200,000 317,000    
Exercise of stock options from 2007 acquisition and Minera Andes Inc. 2,710 2,710    
Exercise of stock options from 2007 acquisition and Minera Andes Inc. (in shares)   852,000    
Shares issued for Mexico mining concessions 227 227    
Shares issued for Mexico mining concessions (in shares) 41,500 42,000    
Realized loss on marketable equity securities (994)   (994)  
Other-than-temporary impairment on marketable equity securities 1,993   1,993  
Net loss (40,453)     (40,453)
Balance at Jun. 30, 2012 $ 853,362 $ 1,287,343 $ (290) $ (433,691)
Balance (in shares) at Jun. 30, 2012   268,295,000