XML 47 R34.htm IDEA: XBRL DOCUMENT
v3.20.2

ASSET RETIREMENT OBLIGATIONS (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2020
ASSET RETIREMENT OBLIGATIONS |
Schedule of reconciliation of asset retirement obligations | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, 2020 |  | December 31, 2019
Asset retirement obligation liability, beginning balance | ​ | $ | 32,201 | ​ | $ | 29,402
Settlements | ​ |  | (185) | ​ |  | (513)
Accretion of liability | ​ |  | 1,389 | ​ |  | 1,680
Adjustment reflecting updated estimates | ​ |  | 673 | ​ |  | 1,012
Foreign exchange revaluation | ​ | ​ | (286) | ​ | ​ | 620
Asset retirement obligation liability, ending balance | ​ | $ | 33,792 | ​ | $ | 32,201
Less current portion | ​ | ​ | 2,860 | ​ | ​ | 2,610
Long-term portion | ​ | $ | 30,932 | ​ | $ | 29,591
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,
​ |  | 2020 |  | 2019 | ​ | 2020 | ​ | 2019
Reclamation adjustment reflecting updated estimates | ​ | $ | 411 | ​ | $ | — | ​ | $ | 614 | ​ | $ | 88
Reclamation accretion | ​ | ​ | 475 | ​ | ​ | 495 | ​ | ​ | 1,389 | ​ | ​ | 1,295
Total | ​ | $ | 886 | ​ | $ | 495 | ​ | $ | 2,003 | ​ | ​ | 1,383

X
- Definition Tabular disclosure for reclamation expense. + References No definition available. + Details
Name: | mux_ReclamationExpenseTableTextBlock
Namespace Prefix: | mux_
Data Type: | nonnum: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: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration