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BUSINESS ACQUISITION (Details 2) (USD $)
 6 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jan. 24, 2012
Dec. 31, 2011
Jun. 30, 2012
McEwen Mining
Jun. 30, 2011
McEwen Mining
Jan. 31, 2012
Minera Andes
Jun. 30, 2012
Minera Andes
Jun. 30, 2012
Minera Andes
Jun. 30, 2011
Minera Andes
Mar. 31, 2012
Minera Andes
Jan. 24, 2012
Minera Andes
Dec. 31, 2011
Minera Andes
General and administrative expenses
Jun. 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 $ 5,300,000       $ 3,900,000 $ 1,400,000
Purchase price:                            
Exchangeable shares of McEwen Mining Minera Andes Acquisition Corporation issued on 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                       597,374,000    
Investment in Minera Santa Cruz S.A.                       224,999,000    
Equipment                     1,600,000 1,647,000    
Accounts payable                       (5,323,000)    
Deferred income tax liability                       (198,378,000)    
Purchase price                       667,846,000    
Excess of purchase consideration over carrying value of the underlying assets for tax purposes                       567,000,000    
Deferred income tax liability 268,615,000     78,786,000                    
Deferred income tax recovery               6,300,000 8,300,000          
Deferred income tax liability related to fluctuations in the foreign exchange rates               190,000,000 190,000,000          
Unaudited Pro Forma Results                            
Revenue 5,969,000 25,716,000     990,000       4,979,000 25,716,000        
Net (loss) income for the period $ (36,955,000) $ (3,182,000)     $ (40,453,000) $ (21,888,000)     $ 3,498,000 $ 18,706,000