XML 247 R99.htm IDEA: XBRL DOCUMENT
v3.25.0.1

INCOME AND MINING TAXES - Changes to Valuation Allowance (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Valuation allowance |  |  |
Balance at beginning of year | $ 130,002 | $ 149,342 | $ 149,921
Additions | 2,780 | 3,391 | 6,600
Deductions | (386) | (22,731) | (7,179)
Balance at end of Period | $ 132,396 | $ 130,002 | $ 149,342

X
- Definition Amount of decrease in the valuation allowance for a specified deferred tax asset. + References No definition available. + Details
Name: | mux_ValuationAllowanceDeferredTaxAssetDecreaseAmount
Namespace Prefix: | mux_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of increase in the valuation allowance for a specified deferred tax asset. + References No definition available. + Details
Name: | mux_ValuationAllowanceDeferredTaxAssetIncreaseAmount
Namespace Prefix: | mux_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
Name: | us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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