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COMMITMENTS AND CONTINGENCIES - Flow-through eligible expenses (Details) - USD ($) $ in Millions | Jun. 14, 2024 | Jun. 30, 2025
--- | --- | ---
Other Commitments |  |
Gross proceeds | $ 21.8 |
Flow through Eligible Expenses |  |
Other Commitments |  |
Renounced commitment |  | $ 14.4
Flow through Eligible Expenses | Timmins |  |
Other Commitments |  |
Gross proceeds | $ 21.8 |

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- Definition Amount of commitment renounced. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Gross equity impact of the value of new stock issued during the period. + References No definition available. + Details
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Namespace Prefix: | mux_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- 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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | mux_MineralPropertyNameAxis=mux_TimminsPropertyInCanadaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |