CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017
CONSOLIDATED STATEMENTS OF CASH FLOWS
Collection of VAT taxes receivable	$ 6,085	$ 1,610

Represents information pertaining to collection of value added taxes receivable.

No definition available.

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