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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		28,521,000us-gaap_CommonStockOtherSharesOutstanding	32,246,000us-gaap_CommonStockOtherSharesOutstanding
Minera Andes
BUSINESS ACQUISITION
Exchange ratio	0.45mux_BusinessAcquisitionShareExchangeRatio / us-gaap_BusinessAcquisitionAxis = mux_MineraAndesIncMember
Exchangeable Shares received by shareholders of acquiree	127,331,498us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued / us-gaap_BusinessAcquisitionAxis = mux_MineraAndesIncMember
Ratio for exchange of exchangeable shares		1mux_CommonStockConversionRatio / us-gaap_BusinessAcquisitionAxis = mux_MineraAndesIncMember
Minera Andes | Replacement options
BUSINESS ACQUISITION
Estimated fair value of the vested portion of the replacement options		3.2us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 / us-gaap_AwardTypeAxis = mux_ReplacementOptionsMember / us-gaap_BusinessAcquisitionAxis = mux_MineraAndesIncMember

X

- 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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Namespace Prefix:	mux_
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X

- 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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Namespace Prefix:	mux_
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X

- 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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Namespace Prefix:	us-gaap_
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- Details

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Balance Type:	na
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X

- 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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- 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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