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COMMITMENTS AND CONTINGENCIES - Streaming Agreement (Details) $ in Millions		3 Months Ended		6 Months Ended
	Aug. 25, 2017 $ / oz	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)
Black Fox Complex
Other commitments
Obligation to sell (as a percent)	8.00%
Long term gold price (in dollars per ounce) | $ / oz	561
Revenue of acquiree since acquisition date and implementation of streaming agreement | $		$ 0.2	$ 0.2	$ 0.6	$ 0.7
Black Fox Complex | Maximum
Other commitments
Inflation adjustment (as a percent)	2.00%
Pike River property
Other commitments
Obligation to sell (as a percent)	6.30%

X

- Definition

Represents the long term gold price per ounce used to find the present value of an amount to be paid or received in the future as an input to measure the fair value.

+ References

No definition available.

+ Details

Name:	mux_FairValueInputsLongTermGoldPricePerOunce
Namespace Prefix:	mux_
Data Type:	srt-types:perUnitItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents inflation adjustment of the long term gold price per ounce.

+ References

No definition available.

+ Details

Name:	mux_InflationAdjustmentLongTermGoldPricePerOunce
Namespace Prefix:	mux_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The percentage the Company is obligated to sell as part of the streaming agreement.

+ References

No definition available.

+ Details

Name:	mux_PercentageOfGoldProductionObligatedToSell
Namespace Prefix:	mux_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

This element represents the amount of revenue of the acquiree since the acquisition date and implementation of the streaming agreement.

+ References

No definition available.

+ Details

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

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

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Data Type:	xbrli:stringItemType
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X

- Details

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Namespace Prefix:
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Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=mux_PikeRiverPropertyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: