XML 52 R42.htm IDEA: XBRL DOCUMENT v3.23.2

INVESTMENTS - Activity in Investments (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2023 USD ($)
Investments rollforward
Opening balance	$ 1,295
Additions/transfers during the period	26,855
Disposals/transfers during period	(162)
Unrealized gain on securities held	3,010
Unrealized foreign exchange loss on securities held	(1,810)
Ending balance	29,188
Marketable equity securities
Investments rollforward
Opening balance	1,133
Additions/transfers during the period	26,855
Unrealized gain on securities held	3,010
Unrealized foreign exchange loss on securities held	(1,810)
Ending balance	29,188
Warrants
Investments rollforward
Opening balance	162
Disposals/transfers during period	$ (162)

X

- Definition

The amount of unrealized foreign exchange gain loss on marketable securities.

+ References

No definition available.

+ Details

Name:	mux_AvailableForSaleAndTradingSecuritiesGrossUnrealizedForeignExchangeGainLoss
Namespace Prefix:	mux_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Gross realized gains (losses) on equity securities.

+ References

No definition available.

+ Details

Name:	mux_AvailableForSaleAndTradingSecuritiesGrossUnrealizedGainLoss
Namespace Prefix:	mux_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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

X

- Definition

Cash flow for purchase of available for sale and trading securities.

+ References

No definition available.

+ Details

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

X

- Definition

The cash inflow associated with the sale of equity securities classified as available-for-sale or trading securities. This refers to cash disposals and includes conversions and removals.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(2))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483467/210-10-45-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1A
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482736/825-10-45-1A

+ Details

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

X

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_DebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentTypeAxis=mux_WarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: