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INCOME (LOSS) PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
LOSS PER SHARE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss | $ (212,775)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (212,775)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (104,022)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 17,887 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (11,343)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 3,264 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (128,681)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (10,982)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (26,285)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (2,654)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (20,364)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (17,351)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (311,943)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (147,742)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (66,654)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Weighted average number of common shares | 290,009,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 297,164,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 297,164,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 297,159,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 297,159,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 297,125,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 297,097,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 296,778,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 274,295,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 279,019,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 278,655,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 244,640,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 297,763,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 297,041,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 261,223,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Loss per common share | $ (0.71)us-gaap_EarningsPerShareBasic | $ (0.71)us-gaap_EarningsPerShareBasic | $ (0.35)us-gaap_EarningsPerShareBasic | $ 0.06 us-gaap_EarningsPerShareBasic | $ (0.04)us-gaap_EarningsPerShareBasic | $ 0.01 us-gaap_EarningsPerShareBasic | $ (0.43)us-gaap_EarningsPerShareBasic | $ (0.04)us-gaap_EarningsPerShareBasic | $ (0.10)us-gaap_EarningsPerShareBasic | $ (0.01)us-gaap_EarningsPerShareBasic | $ (0.07)us-gaap_EarningsPerShareBasic | $ (0.07)us-gaap_EarningsPerShareBasic | $ (1.05)us-gaap_EarningsPerShareBasic | $ (0.50)us-gaap_EarningsPerShareBasic | $ (0.26)us-gaap_EarningsPerShareBasic
Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding not included in the computation of diluted weighted average shares because their effect would have been anti-dilutive (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 3,300,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = mux_OptionsOneMember | 2,100,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = mux_OptionsOneMember | 1,600,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = mux_OptionsOneMember
Average exercise price of options outstanding (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 3.95 mux_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareWeightedAverageExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = mux_OptionsOneMember | $ 5.04 mux_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareWeightedAverageExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = mux_OptionsOneMember | $ 6.32 mux_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareWeightedAverageExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = mux_OptionsOneMember
Other options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options outstanding not included in the computation of diluted weighted average shares because their effect would have been anti-dilutive (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 1,800,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = mux_OptionsTwoMember | 3,600,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = mux_OptionsTwoMember | 2,900,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = mux_OptionsTwoMember

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