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NET INCOME PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
NET INCOME PER SHARE
Net (loss) income	$ 6,021us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 17,887us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Weighted average common shares outstanding (thousands):
Basic (in shares)	297,255,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	297,159,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of employee stock-based awards (in shares)	11,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1,251,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Diluted (in shares)	297,266,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	298,410,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net income (loss) per share:
Basic (in dollars per share)	$ 0.02us-gaap_EarningsPerShareBasic	$ 0.06us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ 0.02us-gaap_EarningsPerShareDiluted	$ 0.06us-gaap_EarningsPerShareDiluted
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)	5,000,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = mux_OptionsOneMember	1,500,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = mux_OptionsOneMember
Average exercise price of options outstanding (in dollars per share)	$ 3.32mux_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareWeightedAverageExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = mux_OptionsOneMember	$ 5.95mux_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareWeightedAverageExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = mux_OptionsOneMember

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