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BUSINESS ACQUISITION (Details 2) (USD $)
 12 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Jan. 24, 2012
Feb. 24, 2011
Dec. 31, 2012
McEwen Mining
Dec. 31, 2011
McEwen Mining
Jan. 24, 2012
Minera Andes
Dec. 31, 2012
Minera Andes
Dec. 31, 2011
Minera Andes
Dec. 31, 2011
Minera Andes
General and administrative expenses
Dec. 31, 2012
Minera Andes
Acquisition cost
BUSINESS ACQUISITION                      
Market price of common stock (in dollars per share)     $ 5.22 $ 6.50              
BUSINESS ACQUISITION                      
Total transaction costs               $ 5,400,000   $ 3,900,000 $ 1,500,000
Purchase price:                      
Exchangeable shares of McEwen Mining-Minera Andes Acquisition Corp. 664,671,000           664,671,000        
Stock options to be exchanged for options of McEwen Mining Inc. 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             539,092,000        
Investment in Minera Santa Cruz S.A.             262,883,000        
Equipment             1,647,000        
Accounts payable             (5,323,000)        
Deferred income tax liability             (177,980,000)        
Purchase price             667,846,000        
Excess of fair value over carrying value of the underlying assets for tax purposes             508,500,000        
Deferred income tax liability 229,522,000 78,786,000           229,500,000      
Deferred income tax recovery               21,100,000      
Deferred income tax liability related to fluctuations in the foreign exchange rates               156,900,000      
Unaudited Pro Forma Results                      
Revenue 31,780,000 44,982,000     26,801,000     4,979,000 44,982,000    
Net (loss) income for the year $ (63,156,000) $ (35,330,000)     $ (66,654,000) $ (61,872,000)   $ 3,498,000 $ 26,542,000