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LONG-TERM DEBT - Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Long-term debt
Balance, beginning of year	$ 48,866	$ 48,160
Promissory note - initial recognition	15,000	40,000
Interest expense	5,488	5,581
Interest payments	(4,875)	(4,875)
Debt amendment fee	(500)
Debt, Current	10,000
Balance, end of year	63,979	48,866
Less: current portion	10,000
Long-term portion	$ 53,979	$ 48,866

X

- Definition

Represents information pertaining to debt amendment fees.

+ References

No definition available.

+ Details

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Namespace Prefix:	mux_
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Balance Type:	debit
Period Type:	duration

X

- Definition

Reflects the total carrying amount as of the balance sheet date of debt and related party debt having initial terms less than one year or the normal operating cycle, if longer.

+ References

No definition available.

+ Details

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X

- Definition

Reflects the total carrying amount as of the balance sheet date of debt and related party debt having initial terms less than one year or the normal operating cycle, if longer.

+ References

No definition available.

+ Details

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Namespace Prefix:	mux_
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X

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt and debt to related parties. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

No definition available.

+ Details

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Namespace Prefix:	mux_
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Balance Type:	credit
Period Type:	instant

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- Definition

Amount of debt and lease obligation, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(21))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Amount of the required periodic payments applied to interest.

+ 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 210.5-02.22)
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

Aggregate amount of interest paid or due on all long-term debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.8)
-URI https://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1402
-Paragraph (a)

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1402
-Paragraph (b)
-Subparagraph (1)

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- References

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- Definition

The cash inflow from a borrowing where a lender is placed in a lien position behind debt having a higher priority of repayment (senior) in liquidation of the entity's assets or underlying collateral.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3255-108585

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