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INVESTMENT IN MINERA SANTA CRUZ S.A. ("MSC") - SAN JOSE MINE (Details)
 3 Months Ended 6 Months Ended 3 Months Ended 5 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 5 Months Ended
Jun. 30, 2012
USD ($)
Jun. 30, 2012
USD ($)
Dec. 31, 2011
USD ($)
Jun. 30, 2012
MSC
USD ($)
Jun. 30, 2012
MSC
USD ($)
Jun. 30, 2012
MSC
USD ($)
Jan. 24, 2012
MSC
Jul. 31, 2012
MSC
Subsequent event
Dividend Declared
USD ($)
Jul. 31, 2012
MSC
Subsequent event
Dividend Declared
ARS
Jun. 30, 2012
MSC
McEwen Mining
USD ($)
Jun. 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       $ 224,999,000 $ 224,999,000 $ 224,999,000          
Income from equity investment 1,595,000 5,597,000   1,595,000 5,597,000 5,597,000          
Amortization of fair value increments (1,803,000) (4,607,000)       (4,607,000)          
Investment in MSC, end of period 225,989,000 225,989,000   225,989,000 225,989,000 225,989,000          
Summary of MSC's financial information from operations                      
Sales percentage       100.00% 100.00%            
Sales       56,375,000 96,603,000            
Net income percentage       100.00% 100.00%            
Net income       3,255,000 11,422,000         1,595,000 5,597,000
Net income on investment in MSC 1,595,000 5,597,000   1,595,000 5,597,000 5,597,000          
Current assets 48,479,000 48,479,000 47,883,000 131,200,000 131,200,000 131,200,000          
Total assets 1,137,218,000 1,137,218,000 310,355,000 714,700,000 714,700,000 714,700,000          
Current liabilities 8,733,000 8,733,000 6,124,000 94,100,000 94,100,000 94,100,000          
Total liabilities 283,856,000 283,856,000 91,051,000 279,800,000 279,800,000 279,800,000          
Dividend declared by MSC               4,400,000 20,000,000    
Dividend payable to the Company               $ 2,200,000 9,800,000