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BUSINESS ACQUISITION (Details) (USD $) In Millions, except Share data, unless otherwise specified | 0 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jan. 24, 2012 | Dec. 31, 2014 | Dec. 31, 2013
BUSINESS ACQUISITION |  |  |
Exchangeable, shares outstanding |  | 28,521,000 us-gaap_CommonStockOtherSharesOutstanding | 32,246,000 us-gaap_CommonStockOtherSharesOutstanding
Minera Andes |  |  |
BUSINESS ACQUISITION |  |  |
Exchange ratio | 0.45 mux_BusinessAcquisitionShareExchangeRatio / us-gaap_BusinessAcquisitionAxis = mux_MineraAndesIncMember |  |
Exchangeable Shares received by shareholders of acquiree | 127,331,498 us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued / us-gaap_BusinessAcquisitionAxis = mux_MineraAndesIncMember |  |
Ratio for exchange of exchangeable shares |  | 1 mux_CommonStockConversionRatio / us-gaap_BusinessAcquisitionAxis = mux_MineraAndesIncMember |
Minera Andes | Replacement options |  |  |
BUSINESS ACQUISITION |  |  |
Estimated fair value of the vested portion of the replacement options |  | 3.2 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 / us-gaap_AwardTypeAxis = mux_ReplacementOptionsMember / us-gaap_BusinessAcquisitionAxis = mux_MineraAndesIncMember |

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- Definition Represents the exchange ratio to determine the number of shares of the acquirer that shareholders of acquiree entity will receive for each share held. + References No definition available. + Details
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- Definition Represents the number of shares of common stock into which each unit of another convertible security can be converted. + References No definition available. + Details
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- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 + Details
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- Definition Total number of shares of other common stock instruments held by shareholders, such as exchangeable shares. May be all or portion of the number of common shares authorized. + References No definition available. + Details
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- Definition Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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