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RECEIVABLES AND OTHER CURRENT ASSETS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Receivables, prepaids and other assets
Government sales tax receivable	$ 1,810	$ 2,658
Prepaids and other assets	3,880	2,607
Receivables and other current assets	5,690	5,265
VAT collected	1,400	2,200	$ 8,300
Prepaid insurance receivable	2,200	700
Property holding and other miscellaneous deposits	1,100	1,400
Mexican Tax Authority
Receivables, prepaids and other assets
Government sales tax receivable	$ 900	$ 700

X

- Definition

The amount of prepaid insurance receivable.

+ References

No definition available.

+ Details

Name:	mux_PrepaidInsuranceReceivable
Namespace Prefix:	mux_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of property holding and other miscellaneous deposits.

+ References

No definition available.

+ Details

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

X

- Definition

The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value and other current assets.

+ References

No definition available.

+ Details

Name:	mux_ReceivablesOtherAssetsNetCurrent
Namespace Prefix:	mux_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of value added tax collected.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets.

+ References

No definition available.

+ Details

Name:	us-gaap_PrepaidExpenseAndOtherAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

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.

+ References

No definition available.

+ Details

Name:	us-gaap_TaxCreditCarryforwardLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Carrying amount as of the balance sheet date of value added taxes due either from customers arising from sales on credit terms, or as previously overpaid to tax authorities. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.8)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_ValueAddedTaxReceivableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_IncomeTaxAuthorityNameAxis=us-gaap_MexicanTaxAuthorityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: