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SHAREHOLDERS' EQUITY (Details) (USD $)
 1 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 0 Months Ended
Jan. 31, 2013
Sep. 30, 2013
Item
Sep. 30, 2013
Item
Sep. 30, 2012
Dec. 31, 2012
Sep. 30, 2013
Maximum
Jan. 24, 2012
Minera Andes Inc.
Dec. 31, 2012
Litigation settlement agreement with respect to the Los Azules Copper Project
TNR
Exchangeable shares converted into common stock     49,900,000          
Outstanding Exchangeable Shares not exchanged   33,500,000 33,500,000          
Shares of common stock issued upon exercise of stock options 1,000,000   48,000       45,000  
Weighted average exercise price of stock options (in dollars per share)     $ 1.97       $ 1.80  
Proceeds from exercise of stock options     $ 171,000 $ 3,564,000     $ 76,926  
Shares of common stock issued as payment for mining concessions in Mexico     41,500          
Settlement agreement regarding outstanding litigation                
Litigation settlement liability         $ 3,830,000     $ 3,800,000
Number of mining contractors with which the entity has entered into an agreement   1 1          
Number of shares to be issued to settle parts of expected future account payable           2,500,000    
Term of the agreement     6 months          
Number of shares agreed to be issued under the agreement     15,800