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SHAREHOLDERS' EQUITY (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 6 Months Ended 1 Months Ended 6 Months Ended 1 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jan. 19, 2012
Dec. 31, 2011
Jan. 31, 2012
Minera Andes
Jun. 30, 2012
Minera Andes
Jun. 30, 2012
Minera Andes
Minimum
Jun. 30, 2012
Minera Andes
Maximum
May 31, 2012
2007 Acquisitions
Jun. 30, 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 42,200,000         45,400,000     2,500,000    
Outstanding exchangeable shares not exchanged 85,100,000                     
Shares of common stock issued 1,200,000               2,500,000    
Exercise price of stock options (in dollars per share)             $ 0.91 $ 3.35      
Proceeds from exercise of stock options $ 3,304 $ 773       $ 3,300          
Shares of common stock issued as part payment for mining concessions in Mexico 41,500