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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, 2022
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |
Option to sell prior to the completion of refining (as a percent) | 90.00%

X
- 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

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