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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 |  |

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