Name:	mux_ReclamationBondsBondingObligation
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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

Represents the percentage of annual fees on the value of the surety bonds.

No definition available.

Name:	mux_SuretyBondsAnnualFeesPercentage
Namespace Prefix:	mux_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Represents a surety bond obligation. It is a promise by a surety or guarantor to pay one party (the obligation) a certain amount if a second party (the principal) fails to meet some obligation, such as fulfilling the terms of a contract.

No definition available.

Name:	mux_SuretyBondsBondingObligation
Namespace Prefix:	mux_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Represents the percentage of the required deposit on the value of the surety bonds.

No definition available.

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Namespace Prefix:	mux_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_LossContingenciesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=123431023&loc=SL98516268-108586

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(1)(a))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(2))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Name:	us-gaap_RestrictedCash
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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Namespace Prefix:
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Balance Type:
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Name:	srt_StatementGeographicalAxis=stpr_NV
Namespace Prefix:
Data Type:	na
Balance Type:
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Name:	srt_StatementGeographicalAxis=country_CA
Namespace Prefix:
Data Type:	na
Balance Type:
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Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=mux_ReclamationBondMember
Namespace Prefix:
Data Type:	na
Balance Type:
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Name:	mux_MineralPropertyNameAxis=mux_TonkinAndGoldBarPropertiesInAggregateMember
Namespace Prefix:
Data Type:	na
Balance Type:
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Name:	mux_MineralPropertyNameAxis=mux_TimminsPropertyInCanadaMember
Namespace Prefix:
Data Type:	na
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Period Type: