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RECEIVABLES, PREPAIDS AND OTHER CURRENT ASSETS (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
RECEIVABLES, PREPAIDS AND OTHER CURRENT ASSETS
Government sales tax receivable	$ 2,319	$ 3,918
Prepaids and other assets	3,984	3,568
Receivables, prepaids and other current assets	$ 6,303	$ 7,486

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- Definition

Receivables Prepaids And Other Assets [Abstract]

+ References

No definition available.

+ Details

Name:	mux_ReceivablesPrepaidsAndOtherAssetsAbstract
Namespace Prefix:	mux_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- 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, prepaids and other current assets.

+ References

No definition available.

+ Details

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

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- 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

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- 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://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3)(a)(4))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

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