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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Products, Properties and Production of Minerals (Details) | 12 Months Ended
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Dec. 31, 2023
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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES. |
Option to sell prior to the completion of refining (as a percent) | 100.00%

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

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- Definition Represents the option held by the entity to sell the product prior to completion of refining. + References No definition available. + Details
Name: | mux_OptionToSellPriorToCompletionOfRefining
Namespace Prefix: | mux_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |