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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Risks and Uncertainties (Details) | 12 Months Ended
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Dec. 31, 2024
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |
Duration current portion of inventories expected to be processed or recovered | 12 months

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- Definition The duration of the current portion of Inventories is determined based on the expected amounts to be processed and/or recovered. + References No definition available. + Details
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Namespace Prefix: | mux_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration