XML 54 R44.htm IDEA: XBRL DOCUMENT
v3.22.2.2

INVESTMENTS (Details) $ / shares in Units, $ in Thousands |  | 9 Months Ended
--- | --- | ---
Jun. 23, 2021 USD ($) property $ / shares shares | Sep. 30, 2021 USD ($)
Investments |  |
Number of common shares | shares | 4,963,455 |
Warrants received | shares | 2,481,727 |
Proceeds from sale of investments | $ |  | $ 492
Disposal Group | Projects in Nevada |  |
Investments |  |
Number of projects sold | property | 2 |
Cash consideration received | $ | $ 500 |
Percentage of common shares received | 10.00% |
Price per common share for each warrant | $ / shares | $ 0.60 |

X
- Definition Shares received as consideration for disposal group. + References No definition available. + Details
Name: | mux_DisposalGroupIncludingDiscontinuedOperationConsiderationSharesReceived
Namespace Prefix: | mux_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Shares received as consideration for disposal group representing percentage of shares issued and outstanding of the acquiree. + References No definition available. + Details
Name: | mux_DisposalGroupIncludingDiscontinuedOperationConsiderationSharesReceivedPercentage
Namespace Prefix: | mux_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Warrants received as consideration for disposal group. + References No definition available. + Details
Name: | mux_DisposalGroupIncludingDiscontinuedOperationConsiderationWarrantsReceived
Namespace Prefix: | mux_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of projects sold. + References No definition available. + Details
Name: | mux_NumberOfProjectsSold
Namespace Prefix: | mux_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21475-112644 + Details
Name: | us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation. + References No definition available. + Details
Name: | us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period. + References No definition available. + Details
Name: | us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_DisposalGroupClassificationAxis=us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=mux_ProjectsInNevadaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |