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BUSINESS ACQUISITION (Details 2) (USD $) | 12 Months Ended |  | 12 Months Ended |  |  | 3 Months Ended | 1 Months Ended | 0 Months Ended | 12 Months Ended |  |  |
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Jan. 24, 2012 | Dec. 31, 2011 McEwen Mining (2011) | Dec. 31, 2012 McEwen Mining (2012) | Dec. 31, 2012 Minera Andes | Dec. 31, 2011 Minera Andes | Dec. 31, 2013 MSC | Dec. 31, 2012 MSC | Sep. 30, 2012 MSC | Jun. 30, 2013 Santa Cruz exploration properties | Oct. 31, 2013 Santa Cruz exploration properties Vend-in agreement MSC | Jan. 24, 2012 Minera Andes | Dec. 31, 2013 Minera Andes | Dec. 31, 2012 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |
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. |  |  |  |  |  |  |  |  |  | 262,900,000 | 225,000,000 |  |  | 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 related to fluctuations in the foreign exchange rates |  |  |  |  |  |  |  |  |  |  |  |  |  | 178,000,000 |  | 156,900,000 |  |
Deferred income tax recovery related to fluctuations in foreign exchange rates |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 36,300,000 |  |  |
Impairment charges | 62,963,000 | 18,468,000 |  |  |  |  |  |  | 95,878,000 |  |  | 27,700,000 |  |  |  |  |  |
Deferred income tax recovery |  |  |  |  |  |  |  |  |  |  |  | 2,300,000 |  |  |  |  |  |
Carrying value of mineral property interest | 642,968,000 | 767,067,000 | 245,454,000 |  |  |  |  |  |  |  |  |  | 53,200,000 |  |  |  |  |
Decrease in deferred tax liability related to properties transferred |  |  |  |  |  |  |  |  |  |  |  |  | 16,700,000 |  |  |  |  |
Deferred income tax liability | 158,855,000 | 229,522,000 |  |  |  |  |  |  |  |  |  |  |  |  | 101,500,000 |  |  |
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) |  | $ (61,872,000) | $ (66,654,000) | $ 3,498,000 | $ 26,542,000 |  |  |  |  |  |  |  |  |  |

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