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BUSINESS ACQUISITION (Details 2) (USD $)
 3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Jan. 24, 2012
BUSINESS ACQUISITION      
Market price of common stock (in dollars per share)     $ 5.22
Net assets acquired:      
Deferred income tax liability $ 223,059,000 $ 229,522,000  
Minera Andes
      
Net assets acquired:      
Purchase price     667,800,000
Deferred income tax liability     178,000,000
Excess of fair value over carrying value of the underlying assets for tax purposes     508,500,000
Deferred income tax recovery 6,200,000    
Deferred income tax liability related to fluctuations in the foreign exchange rates 150,600,000    
Deferred income tax liability $ 223,100,000 $ 156,900,000