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BUSINESS ACQUISITION (Details) (USD $) In Millions, except Share data, unless otherwise specified |  | 0 Months Ended | 12 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Jan. 24, 2012 Minera Andes | Dec. 31, 2013 Minera Andes | Dec. 31, 2013 Minera Andes Replacement options | Jun. 30, 2011 Minera Andes Robert R. McEwen | Dec. 31, 2013 Minera Andes Robert R. McEwen
BUSINESS ACQUISITION |  |  |  |  |  |
Exchange ratio |  | 0.45 |  |  |  |
Exchangeable Shares received by shareholders of acquiree |  | 127,331,498 |  |  | 38,700,000 |
Shareholding of combined company by the then-existing McEwen Mining shareholders (as a percent) |  | 52.00% |  |  |  |
Shareholding of combined company by former Minera Andes shareholders (as a percent) |  | 48.00% |  |  |  |
Shareholding of combined company on a diluted basis by the then-existing McEwen Mining shareholders (as a percent) |  | 53.00% |  |  |  |
Shareholding of combined company on a diluted basis by former Minera Andes shareholders (as a percent) |  | 47.00% |  |  |  |
Percentage of shares of the company owned |  |  |  |  |  | 25.00%
Outstanding Exchangeable Shares not exchanged | 32,200,000 |  |  |  |  | 500,000
Ratio for exchange of exchangeable shares |  |  | 1 |  |  |
Estimated fair value of the vested portion of the replacement options |  |  |  | $ 3.2 |  |

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