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SEGMENTED INFORMATION (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Operating Segment Reporting
Gold and silver sales	$ 22,882us-gaap_RevenueMineralSales	$ 11,130us-gaap_RevenueMineralSales
Production costs applicable to sales	(10,454)us-gaap_CostOfGoodsSold	(8,527)us-gaap_CostOfGoodsSold
Mine construction costs		(939)us-gaap_OtherConstructionCosts
Mine development costs	(174)us-gaap_ConstructionAndDevelopmentCosts	(1,568)us-gaap_ConstructionAndDevelopmentCosts
Exploration costs	(2,342)us-gaap_ExplorationExpenseMining	(2,680)us-gaap_ExplorationExpenseMining
Income on investment in Minera Santa Cruz S.A. (net of amortization)	329us-gaap_IncomeLossFromEquityMethodInvestments	7,029us-gaap_IncomeLossFromEquityMethodInvestments
Operating loss	5,168us-gaap_OperatingIncomeLoss	(562)us-gaap_OperatingIncomeLoss
Investment in Minera Santa Cruz S.A.	177,347us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures		177,018us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
Mineral property interests	287,490us-gaap_MineralPropertiesNet		287,812us-gaap_MineralPropertiesNet
Total assets	526,733us-gaap_Assets		522,958us-gaap_Assets
Argentina
Operating Segment Reporting
Exploration costs	(263)us-gaap_ExplorationExpenseMining / us-gaap_StatementBusinessSegmentsAxis = mux_ArgentinaReportableSegmentMember	(501)us-gaap_ExplorationExpenseMining / us-gaap_StatementBusinessSegmentsAxis = mux_ArgentinaReportableSegmentMember
Income on investment in Minera Santa Cruz S.A. (net of amortization)	329us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = mux_ArgentinaReportableSegmentMember	7,029us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = mux_ArgentinaReportableSegmentMember
Operating loss	(219)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mux_ArgentinaReportableSegmentMember	6,258us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mux_ArgentinaReportableSegmentMember
Investment in Minera Santa Cruz S.A.	177,347us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementBusinessSegmentsAxis = mux_ArgentinaReportableSegmentMember		177,018us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementBusinessSegmentsAxis = mux_ArgentinaReportableSegmentMember
Mineral property interests	202,889us-gaap_MineralPropertiesNet / us-gaap_StatementBusinessSegmentsAxis = mux_ArgentinaReportableSegmentMember		202,889us-gaap_MineralPropertiesNet / us-gaap_StatementBusinessSegmentsAxis = mux_ArgentinaReportableSegmentMember
Total assets	382,883us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mux_ArgentinaReportableSegmentMember		382,637us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mux_ArgentinaReportableSegmentMember
Mexico
Operating Segment Reporting
Gold and silver sales	22,882us-gaap_RevenueMineralSales / us-gaap_StatementBusinessSegmentsAxis = mux_MexicoReportableSegmentMember	11,130us-gaap_RevenueMineralSales / us-gaap_StatementBusinessSegmentsAxis = mux_MexicoReportableSegmentMember
Production costs applicable to sales	(10,454)us-gaap_CostOfGoodsSold / us-gaap_StatementBusinessSegmentsAxis = mux_MexicoReportableSegmentMember	(8,527)us-gaap_CostOfGoodsSold / us-gaap_StatementBusinessSegmentsAxis = mux_MexicoReportableSegmentMember
Mine construction costs		(939)us-gaap_OtherConstructionCosts / us-gaap_StatementBusinessSegmentsAxis = mux_MexicoReportableSegmentMember
Mine development costs	(174)us-gaap_ConstructionAndDevelopmentCosts / us-gaap_StatementBusinessSegmentsAxis = mux_MexicoReportableSegmentMember	(1,568)us-gaap_ConstructionAndDevelopmentCosts / us-gaap_StatementBusinessSegmentsAxis = mux_MexicoReportableSegmentMember
Exploration costs	(1,599)us-gaap_ExplorationExpenseMining / us-gaap_StatementBusinessSegmentsAxis = mux_MexicoReportableSegmentMember	(1,388)us-gaap_ExplorationExpenseMining / us-gaap_StatementBusinessSegmentsAxis = mux_MexicoReportableSegmentMember
Operating loss	8,347us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mux_MexicoReportableSegmentMember	(3,048)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mux_MexicoReportableSegmentMember
Mineral property interests	10,374us-gaap_MineralPropertiesNet / us-gaap_StatementBusinessSegmentsAxis = mux_MexicoReportableSegmentMember		10,696us-gaap_MineralPropertiesNet / us-gaap_StatementBusinessSegmentsAxis = mux_MexicoReportableSegmentMember
Total assets	58,970us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mux_MexicoReportableSegmentMember		58,936us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mux_MexicoReportableSegmentMember
United States
Operating Segment Reporting
Exploration costs	(389)us-gaap_ExplorationExpenseMining / us-gaap_StatementBusinessSegmentsAxis = mux_UnitedStatesReportableSegmentMember	(686)us-gaap_ExplorationExpenseMining / us-gaap_StatementBusinessSegmentsAxis = mux_UnitedStatesReportableSegmentMember
Operating loss	(681)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mux_UnitedStatesReportableSegmentMember	(1,429)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = mux_UnitedStatesReportableSegmentMember
Mineral property interests	74,227us-gaap_MineralPropertiesNet / us-gaap_StatementBusinessSegmentsAxis = mux_UnitedStatesReportableSegmentMember		74,227us-gaap_MineralPropertiesNet / us-gaap_StatementBusinessSegmentsAxis = mux_UnitedStatesReportableSegmentMember
Total assets	74,885us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mux_UnitedStatesReportableSegmentMember		74,806us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mux_UnitedStatesReportableSegmentMember
Corporate & Other
Operating Segment Reporting
Exploration costs	(91)us-gaap_ExplorationExpenseMining / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember	(105)us-gaap_ExplorationExpenseMining / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember
Operating loss	(2,279)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember	(2,343)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember
Total assets	$ 9,995us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember		$ 6,579us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember

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