CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
CONSOLIDATED STATEMENTS OF CASH FLOWS
Collection of VAT taxes receivable	$ 126	$ 1,968

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