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SHAREHOLDERS' EQUITY (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
1 Months Ended 6 Months Ended
Jan. 31, 2013
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Exchangeable shares converted into common stock   47,600,000    
Outstanding Exchangeable Shares not exchanged   35,800,000    
Shares of common stock issued upon exercise of stock options 1,000,000 48,000    
Weighted average exercise price of stock options (in dollars per share)   $ 1.97    
Proceeds from exercise of stock options   $ 95 $ 3,304  
Shares of common stock issued as payment for mining concessions in Mexico   41,500    
Settlement agreement regarding outstanding litigation        
Litigation settlement liability       3,830
Litigation settlement agreement with respect to the Los Azules Copper Project | TNR
       
Settlement agreement regarding outstanding litigation        
Litigation settlement liability       $ 3,800