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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	$ 17,887us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ (11,343)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 3,264us-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	290,009,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	297,164,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	297,164,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	297,159,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	297,159,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	297,125,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	297,097,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	296,778,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	274,295,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	279,019,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	278,655,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	244,640,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	297,763,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	297,041,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	261,223,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Loss per common share	$ (0.71)us-gaap_EarningsPerShareBasic	$ (0.71)us-gaap_EarningsPerShareBasic	$ (0.35)us-gaap_EarningsPerShareBasic	$ 0.06us-gaap_EarningsPerShareBasic	$ (0.04)us-gaap_EarningsPerShareBasic	$ 0.01us-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)													3,300,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = mux_OptionsOneMember	2,100,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = mux_OptionsOneMember	1,600,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = mux_OptionsOneMember
Average exercise price of options outstanding (in dollars per share)													$ 3.95mux_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareWeightedAverageExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = mux_OptionsOneMember	$ 5.04mux_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareWeightedAverageExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = mux_OptionsOneMember	$ 6.32mux_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)													1,800,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = mux_OptionsTwoMember	3,600,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = mux_OptionsTwoMember	2,900,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = mux_OptionsTwoMember

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