XML 64 R54.htm IDEA: XBRL DOCUMENT
v3.22.2.2

ASSET RETIREMENT OBLIGATIONS - Reclamation and Accretion (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Reclamation obligations |  |  |  |
Reclamation adjustment reflecting updated estimates |  | $ 830 | $ 986 | $ 1,256
Reclamation accretion | $ 526 | 479 | 1,573 | 1,470
Total | $ 526 | $ 1,309 | $ 2,559 | $ 2,725

X
- Definition Amount of reclamation adjustments during the period. + References No definition available. + Details
Name: | mux_ReclamationAdjustments
Namespace Prefix: | mux_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of reclamation and remediation expenses. + References No definition available. + Details
Name: | mux_ReclamationAndRemediationExpense
Namespace Prefix: | mux_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount recognized for the passage of time, typically for liabilities, that have been discounted to their net present values. Excludes accretion associated with asset retirement obligations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI https://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 35 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=6394232&loc=d3e17558-110866 + Details
Name: | us-gaap_AccretionExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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