XML 45 R29.htm IDEA: XBRL DOCUMENT
v2.4.0.8

MINERAL PROPERTY INTERESTS AND ASSET RETIREMENT OBLIGATIONS (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2013
MINERAL PROPERTY INTERESTS AND ASSET RETIREMENT OBLIGATIONS |
Schedule of impairment charges on mineral property |
Name of Property/Complex |  | Segment |  | 2013 |  | 2012 |  | 2011 |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
|  |  |  | (in thousands) |
Telken Tenements |  | Argentina |  | $ | 13,792 |  | $ | — |  | $ | — |
Este Tenements |  | Argentina |  |  | 2,784 |  |  | — |  |  | — |
Piramides Tenements |  | Argentina |  |  | 5,079 |  |  | — |  |  | — |
Tobias Tenements |  | Argentina |  |  | 6,074 |  |  | — |  |  | — |
North Battle Mountain Complex |  | Nevada |  |  | — |  |  | 14,044 |  |  | — |
West Battle Mountain Complex |  | Nevada |  |  | 6,287 |  |  | — |  |  | — |
Limo Complex |  | Nevada |  |  | 19,450 |  |  | — |  |  |  |
Other United States Properties |  | Nevada |  |  | 9,497 |  |  | 2,902 |  |  | — |
El Gallo 2 Properties |  | Mexico |  |  | — |  |  | 1,343 |  |  | — |
Property, plant and equipment |  | Argentina |  |  | — |  |  | 179 |  |  | — |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total impairment |  |  |  | $ | 62,963 |  | $ | 18,468 |  | $ | — |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Summary of mineral property interests |
Name of Property/Complex |  | State/Province |  | Country |  | 2013 |  | 2012 |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
|  |  |  |  |  | (in thousands) |
Los Azules Copper Project |  | San Juan |  | Argentina |  | $ | 431,190 |  | $ | 431,190 |
Other San Juan Exploration Properties |  | San Juan |  | Argentina |  |  | 7,818 |  |  | 7,818 |
Telken Tenements(1) |  | Santa Cruz |  | Argentina |  |  | — |  |  | 40,234 |
Este Tenements(1) |  | Santa Cruz |  | Argentina |  |  | — |  |  | 8,121 |
Piramides Tenements(1) |  | Santa Cruz |  | Argentina |  |  | — |  |  | 14,815 |
Tobias Tenements(1) |  | Santa Cruz |  | Argentina |  |  | — |  |  | 17,719 |
Cerro Mojon Tenements |  | Santa Cruz |  | Argentina |  |  | 1,971 |  |  | 1,971 |
La Merced Tenements |  | Santa Cruz |  | Argentina |  |  | 1,891 |  |  | 1,891 |
Cabeza de Vaca Tenements |  | Santa Cruz |  | Argentina |  |  | 877 |  |  | 877 |
El Trumai Tenements |  | Santa Cruz |  | Argentina |  |  | 1,534 |  |  | 1,534 |
Martes 13 Tenements |  | Santa Cruz |  | Argentina |  |  | 3,568 |  |  | 3,568 |
Celestina Tenements |  | Santa Cruz |  | Argentina |  |  | 1,753 |  |  | 1,753 |
Other Santa Cruz Exploration Properties |  | Santa Cruz |  | Argentina |  |  | 7,601 |  |  | 7,601 |
Tonkin Complex |  | Nevada |  | United States |  |  | 51,946 |  |  | 51,989 |
Gold Bar Complex |  | Nevada |  | United States |  |  | 77,012 |  |  | 77,012 |
Limo Complex |  | Nevada |  | United States |  |  | 23,438 |  |  | 50,098 |
North Battle Mountain Complex |  | Nevada |  | United States |  |  | 4,148 |  |  | 4,148 |
East Battle Mountain Complex |  | Nevada |  | United States |  |  | 4,060 |  |  | 4,060 |
West Battle Mountain Complex |  | Nevada |  | United States |  |  | 2,567 |  |  | 8,854 |
Other United States Properties |  | Nevada |  | United States |  |  | 9,610 |  |  | 19,107 |
El Gallo 1 Mine |  | Sinaloa |  | Mexico |  |  | 8,502 |  |  | 8,126 |
El Gallo 2 Properties |  | Sinaloa |  | Mexico |  |  | 3,482 |  |  | 4,581 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total Mineral Property Interests |  |  |  |  |  | $ | 642,968 |  | $ | 767,067 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(1) As at December 31, 2013, these tenements were transferred to MSC as part of the vend-in agreement described above and in Note 7, Investment in Minera Santa Cruz S.A. ("MSC")—San José Mine, and were therefore not included in the Company's mineral property interests as at December 31, 2013.
Schedule of changes in asset retirement obligations |
|  | 2013 |  | 2012 |
--- | --- | --- | --- | --- | ---
|  | (in thousands) |
Asset retirement obligation liability—opening balance |  | $ | 6,359 |  | $ | 6,253 |
Settlements |  |  | (60 | ) |  | (47 | )
Accretion of liability |  |  | 461 |  |  | 447 |
Adjustment reflecting updated estimates |  |  | 487 |  |  | (294 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Asset retirement obligation liability—ending balance |  | $ | 7,247 |  | $ | 6,359 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​

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 mineral properties held by the entity. + References No definition available. + Details
Name: | mux_ScheduleOfMineralPropertiesTableTextBlock
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