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INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE (Details 2)
 3 Months Ended 9 Months Ended 3 Months Ended 6 Months Ended 8 Months Ended 9 Months Ended 1 Months Ended 3 Months Ended 8 Months Ended
Sep. 30, 2012
USD ($)
Sep. 30, 2012
USD ($)
Dec. 31, 2011
USD ($)
Sep. 30, 2012
MSC
USD ($)
Jun. 30, 2012
MSC
USD ($)
Mar. 31, 2012
MSC
USD ($)
Jun. 30, 2012
MSC
USD ($)
Sep. 30, 2012
MSC
USD ($)
Sep. 30, 2012
MSC
USD ($)
Jan. 24, 2012
MSC
Jul. 31, 2012
MSC
Dividend Declared
USD ($)
Jul. 31, 2012
MSC
Dividend Declared
ARS
Sep. 30, 2012
MSC
Subsequent event
Dividend Declared
USD ($)
Sep. 30, 2012
MSC
Subsequent event
Dividend Declared
ARS
Sep. 30, 2012
MSC
McEwen Mining
USD ($)
Sep. 30, 2012
MSC
McEwen Mining
USD ($)
Nature of Operations and Basis of Presentation                                
Interest acquired (as a percent)                   49.00%            
Interest held (as a percent)       49.00%       49.00% 49.00%              
Change in the investment in MSC                                
Fair value of investment in MSC from acquisition of Minera Andes       $ 261,186,000       $ 261,186,000 $ 261,186,000              
Income from equity investment 11,311,000 14,759,000   12,908,000       18,505,000 18,505,000              
Amortization of fair value increments       (1,597,000) 1,259,000 890,000 2,149,000   (3,746,000)              
Dividends                 (4,765,000)              
Investment in MSC, end of period 271,180,000 271,180,000   271,180,000       271,180,000 271,180,000              
Summary of MSC's financial information from operations                                
Sales percentage       100.00%       100.00% 100.00%              
Sales       116,299,000       212,902,000                
Net income percentage       100.00%       100.00%                
Net income       26,343,000 (20,707,000) (16,997,000) (37,995,000) 37,765,000             12,908,000 18,505,000
Income on investment in MSC 11,311,000 14,759,000   12,908,000       18,505,000 18,505,000              
Income on investment in MSC, net of amortization       11,311,000       14,759,000                
Current assets 36,020,000 36,020,000 47,883,000 151,700,000       151,700,000 151,700,000              
Total assets 1,111,205,000 1,111,205,000 310,355,000 839,800,000       839,800,000 839,800,000              
Current liabilities 7,504,000 7,504,000 6,124,000 99,400,000       99,400,000 99,400,000              
Total liabilities 256,834,000 256,834,000 91,051,000 303,000,000       303,000,000 303,000,000              
Dividend declared by MSC                         5,300,000 25,000,000    
Dividend payable to the Company                     $ 2,200,000 9,800,000 $ 12,250,000 2,600,000