XML 42 R32.htm IDEA: XBRL DOCUMENT
v3.22.2.2

ASSET RETIREMENT OBLIGATIONS (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2022
ASSET RETIREMENT OBLIGATIONS |
Schedule of reconciliation of asset retirement obligations | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ | ​ | ​ | ​ |  | Nine months ended September 30, 2022 |  | Year ended December 31, 2021
Asset retirement obligation liability, beginning balance | ​ | ​ | ​ | ​ | ​ | ​ | ​ | $ | 35,452 | ​ | $ | 34,000
Settlements | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | (372) | ​ |  | (2,225)
Accretion of liability | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | 1,572 | ​ |  | 2,405
Revisions to estimates and discount rate | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | 2,436 | ​ |  | 1,257
Foreign exchange revaluation | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | (999) | ​ | ​ | 15
Asset retirement obligation liability, ending balance | ​ | ​ | ​ | ​ | ​ | ​ | ​ | $ | 38,089 | ​ | $ | 35,452
Less current portion | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 12,889 | ​ | ​ | 5,761
Long-term portion | ​ | ​ | ​ | ​ | ​ | ​ | ​ | $ | 25,200 | ​ | $ | 29,691
Schedule of reclamation expense | The Company’s reclamation expenses for the periods presented consisted of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended September 30, | ​ | Nine months ended September 30,
​ |  | 2022 |  | 2021 | ​ | 2022 | ​ | 2021
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 Tabular disclosure for reclamation expense. + References No definition available. + Details
Name: | mux_ReclamationExpenseTableTextBlock
Namespace Prefix: | mux_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
Name: | us-gaap_ScheduleOfChangeInAssetRetirementObligationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration