XML 47 R23.htm IDEA: XBRL DOCUMENT
v2.4.0.8

MINERAL PROPERTY INTERESTS AND ASSET RETIREMENT OBLIGATIONS (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2014
MINERAL PROPERTY INTERESTS AND ASSET RETIREMENT OBLIGATIONS |
Schedule of impairment charges on mineral property |
|  |  |  | Three months ended September 30, |  | Nine months ended September 30, |
Name of Property/Complex |  | Segment |  | 2014 |  | 2013 |  | 2014 |  | 2013 |
|  |  |  | (in thousands) |
Telken Tenements |  | Argentina |  | $ | — |  | $ | — |  | $ | — |  | $ | 13,792 |
Este Tenements |  | Argentina |  | — |  | — |  | — |  | 2,784 |
Piramides Tenements |  | Argentina |  | — |  | — |  | — |  | 5,079 |
Tobias Tenements |  | Argentina |  | — |  | — |  | — |  | 6,074 |
Los Azules Project |  | Argentina |  | — |  | — |  | 120,398 |  | — |
West Battle Mountain Complex |  | Nevada |  | — |  | 6,287 |  | — |  | 6,287 |
Total impairments |  |  |  | $ | — |  | $ | 6,287 |  | $ | 120,398 |  | $ | 34,016 |
Schedule of reconciliation of asset retirement obligations |
|  | Nine months ended |  | Year Ended |
|  | September 30, 2014 |  | December 31, 2013 |
|  | (in thousands) |
Asset retirement obligation liability, beginning balance |  | $ | 7,247 |  | $ | 6,359 |
Settlements |  | (43 | ) | (60 | )
Accretion of liability |  | 309 |  | 461 |
Adjustment reflecting updated estimates |  | (79 | ) | 487 |
Asset retirement obligation liability, ending balance |  | $ | 7,434 |  | $ | 7,247 |

X
- Details
Name: | mux_MineralPropertyInterestsAndAssetRetirementObligationsDisclosureAbstract
Namespace Prefix: | mux_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of impairment charges on mineral properties held by the entity. + References No definition available. + Details
Name: | mux_ScheduleOfImpairmentChargesOnMineralPropertiesTableTextBlock
Namespace Prefix: | mux_
Data Type: | nonnum:textBlockItemType
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/2003/role/presentationRef -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