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BUSINESS ACQUISITION (Details 2) (USD $)
 9 Months Ended 9 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Jan. 24, 2012
Dec. 31, 2011
Sep. 30, 2012
McEwen Mining
Sep. 30, 2011
McEwen Mining
Jan. 31, 2012
Minera Andes
Jun. 30, 2012
Minera Andes
Sep. 30, 2012
Minera Andes
Sep. 30, 2011
Minera Andes
Jan. 24, 2012
Minera Andes
Dec. 31, 2011
Minera Andes
General and administrative expenses
Sep. 30, 2012
Minera Andes
Acquisition cost
BUSINESS ACQUISITION                          
Market price of common stock (in dollars per share)     $ 5.22                    
BUSINESS ACQUISITION                          
Total transaction costs                 $ 5,300,000     $ 3,900,000 $ 1,400,000
Purchase price:                          
Exchangeable shares of McEwen Mining - Minera Andes Acquisition 664,671,000           664,671,000            
Stock options to be exchanged for options of McEwen Mining 3,175,000           3,175,000            
Purchase price                     667,846,000    
Net assets acquired:                          
Cash and cash equivalents                     31,385,000    
Short-term investments                     4,952,000    
Other current assets                     9,828,000    
Inventories                     1,362,000    
Mineral property interests                     541,702,000    
Investment in Minera Santa Cruz S.A.                     261,186,000    
Equipment                     1,647,000    
Accounts payable                     (5,323,000)    
Deferred income tax liability                     (178,893,000)    
Purchase price                     667,846,000    
Excess of purchase consideration over carrying value of the underlying assets for tax purposes                     511,100,000    
Deferred income tax liability 242,761,000     78,786,000                  
Deferred income tax recovery               5,400,000 13,700,000        
Deferred income tax liability related to fluctuations in the foreign exchange rates                 165,200,000        
Unaudited Pro Forma Results                          
Revenue 20,194,000 35,830,000     15,215,000       4,979,000 35,830,000      
Net (loss) income for the period $ (37,080,000) $ (22,162,000)     $ (40,578,000) $ (45,568,000)     $ 3,498,000 $ 23,406,000