Name:	mux_FairValueInputsLongTermGoldPricePerOunce
Namespace Prefix:	mux_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	duration

Represents inflation adjustment of the long term gold price per ounce.

No definition available.

Name:	mux_InflationAdjustmentLongTermGoldPricePerOunce
Namespace Prefix:	mux_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The percentage the Company is obligated to sell as part of the streaming agreement.

No definition available.

Name:	mux_PercentageOfGoldProductionObligatedToSell
Namespace Prefix:	mux_
Data Type:	num: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_OtherCommitmentsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688