XML 45 R34.htm IDEA: XBRL DOCUMENT
v3.21.2

ASSET RETIREMENT OBLIGATIONS (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2021
ASSET RETIREMENT OBLIGATIONS |
Schedule of reconciliation of asset retirement obligations | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, 2021 |  | December 31, 2020 |
Asset retirement obligation liability, beginning balance | ​ | $ | 34,000 | ​ | $ | 32,201 | ​
Settlements | ​ |  | (2,138) | ​ |  | (267) | ​
Accretion of liability | ​ |  | 1,470 | ​ |  | 1,901 | ​
Revisions to estimates and discount rate | ​ |  | 1,256 | ​ |  | (54) | ​
Foreign exchange revaluation | ​ | ​ | (8) | ​ | ​ | 219 | ​
Asset retirement obligation liability, ending balance | ​ | $ | 34,580 | ​ | $ | 34,000 | ​
Less current portion | ​ | ​ | 4,894 | ​ | ​ | 3,232 | ​
Long-term portion | ​ | $ | 29,686 | ​ | $ | 30,768 | ​
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,
​ |  | 2021 |  | 2020 | ​ | 2021 | ​ | 2020
Reclamation adjustment reflecting updated estimates | ​ | $ | 830 | ​ | $ | 411 | ​ | $ | 1,256 | ​ | $ | 614
Reclamation accretion | ​ | ​ | 479 | ​ | ​ | 475 | ​ | ​ | 1,470 | ​ | ​ | 1,389
Total | ​ | $ | 1,309 | ​ | $ | 886 | ​ | $ | 2,725 | ​ | ​ | 2,003

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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
Name: | us-gaap_ScheduleOfChangeInAssetRetirementObligationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration