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SHAREHOLDERS' EQUITY (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 9 Months Ended 1 Months Ended 9 Months Ended 1 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Jan. 19, 2012
Dec. 31, 2011
Jan. 31, 2012
Minera Andes
Sep. 30, 2012
Minera Andes
Sep. 30, 2012
Minera Andes
Minimum
Sep. 30, 2012
Minera Andes
Maximum
May 31, 2012
2007 Acquisitions
Jan. 19, 2012
Series B Special Voting Preferred Stock
Common stock, shares authorized 500,000,000   500,000,000 500,000,000            
Preferred stock, shares authorized                   1
Issuance of 2012 Exchangeable Shares in connection with the acquisition of Minera Andes         127,331,498          
Exchangeable shares converted into common stock 51,600,000         48,400,000     2,500,000  
Outstanding exchangeable shares not exchanged 78,900,000                  
Shares of common stock issued 1,300,000               2,500,000  
Exercise price of stock options (in dollars per share)             $ 0.91 $ 3.35    
Proceeds from exercise of stock options $ 3,564 $ 773       $ 3,600        
Shares of common stock issued as part payment for mining concessions in Mexico 83,000