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COMMITMENTS AND CONTINGENCIES - Streaming agreement (Details) $ in Millions		3 Months Ended		6 Months Ended
	Aug. 25, 2017 $ / oz	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) $ / oz	Jun. 30, 2024 USD ($) $ / oz
Pike River property
Other Commitments
Obligation to sell (as a percent)	6.30%
Black Fox Complex
Other Commitments
Obligation to sell (as a percent)	8.00%
Long term gold price (in dollars per ounce)	561
Revenue of acquiree since acquisition date and implementation of streaming agreement | $		$ 0.3	$ 0.4	$ 0.5	$ 0.8
Realized price for streaming contract per ounce				609	597
Black Fox Complex | Maximum
Other Commitments
Inflation adjustment (as a percent)	2.00%

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

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Namespace Prefix:	mux_
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X

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	mux_
Data Type:	dtr-types:percentItemType
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X

- Definition

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

+ References

No definition available.

+ Details

Name:	mux_PercentageOfGoldProductionObligatedToSell
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X

- Definition

The realized gold price per ounce under the streaming agreement.

+ References

No definition available.

+ Details

Name:	mux_RealizedGoldPricePerOunce
Namespace Prefix:	mux_
Data Type:	srt-types:perUnitItemType
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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

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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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X

- Details

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Namespace Prefix:
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Period Type:

X

- Details

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X

- Details

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