XML 117 R14.htm IDEA: XBRL DOCUMENT
v3.20.1

MINERAL PROPERTY INTERESTS AND PLANT AND EQUIPMENT | 12 Months Ended
--- | ---
Dec. 31, 2019
MINERAL PROPERTY INTERESTS AND PLANT AND EQUIPMENT |
MINERAL PROPERTY INTERESTS AND PLANT AND EQUIPMENT | NOTE 8 MINERAL PROPERTY INTERESTS AND PLANT AND EQUIPMENT The cost and carrying value of mineral property interests and plant and equipment at December 31, 2019 and 2018 are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2019 |  | December 31, 2018
Mineral property interests, cost | ​ | $ | 339,374 | ​ | $ | 326,086
Less: accumulated depletion | ​ | ​ | (28,154) | ​ | ​ | (16,941)
Mineral property interests, carrying value | ​ | $ | 311,220 | ​ | $ | 309,145
​ | ​ | ​ | ​ | ​ | ​ | ​
Plant and equipment, cost | ​ | ​ | ​ | ​ | ​ | ​
Land | ​ | $ | 8,746 | ​ | $ | 8,699
Construction in progress | ​ | ​ | 2,961 | ​ | ​ | 74,643
Plant and equipment | ​ | ​ | 133,014 | ​ | ​ | 49,578
Subtotal | ​ | $ | 144,721 | ​ | $ | 132,920
Less: accumulated depreciation | ​ |  | (37,150) | ​ | ​ | (18,186)
Plant and equipment, carrying value | ​ | $ | 107,571 | ​ | $ | 114,734
​ | ​ | ​ | ​ | ​ | ​ | ​
Mineral property interests and plant and equipment, carrying value | ​ | $ | 418,791 | ​ | $ | 423,879
​ Plant and equipment at December 31, 2019 includes $1.4 million of capitalized interest related to the Gold Bar mine (December 31, 2018 – $0.8 million). On February 16, 2019, first production occurred at the Gold Bar mine and related construction-in-progress costs were transferred into the appropriate category of plant and equipment and amortized. As at December 31, 2018, the Gold Bar project construction-in-progress included expenditures incurred for the construction of the heap leach, ADR, and crusher facilities as well as expenditures for mobilization, design and engineering among others. ​ Mineral property interest carrying value at December 31, 2019 and 2018 includes the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Name of Property/Complex |  | State/Province | ​ | Country | ​ | 2019 | ​ | 2018 |
Black Fox Complex | ​ | Ontario | ​ | Canada | ​ | $ | 14,627 | ​ | $ | 16,365 | ​
Lexam | ​ | Ontario | ​ | Canada | ​ | ​ | 41,595 | ​ | ​ | 41,595 | ​
Los Azules Copper Project |  | San Juan |  | Argentina | ​ | ​ | 191,490 | ​ | ​ | 191,490 | ​
Tonkin Properties |  | Nevada |  | United States | ​ |  | 4,833 | ​ |  | 4,833 | ​
Gold Bar Project |  | Nevada |  | United States | ​ |  | 48,492 | ​ |  | 44,131 | ​
Battle Mountain Complex |  | Nevada |  | United States | ​ |  | 785 | ​ |  | 785 | ​
El Gallo Project |  | Sinaloa |  | Mexico | ​ |  | 3,591 | ​ |  | 4,139 | ​
Fenix Project Properties |  | Sinaloa |  | Mexico | ​ |  | 5,807 | ​ |  | 5,807 | ​
Total mineral property interests | ​ | ​ | ​ | ​ | ​ | $ | 311,220 | ​ | $ | 309,145 | ​
​ Black Fox and Gold Bar mineral property interest are depleted based on the units of production method from production commencement date over the proven and probable reserves. The El Gallo Project is depleted and depreciated using the straight line or units-of-production method over the stated mine life, as the project does not have proven and probable reserves compliant with Guide 7. The Company conducts a review of potential triggering events for impairment for all its mineral projects on a quarterly basis or when events or changes in circumstances indicate that the related carrying amounts may not be recoverable. No triggering events were identified for the years ended December 31, 2019 and 2018. For the year ended December 31, 2017, the Company recorded an impairment charge of $0.7 million against certain construction-in-progress equipment relating to the Fenix Project.

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

X
- Definition The entire disclosure for Mineral property interests, plant and Equipment And Construction In Progress. + References No definition available. + Details
Name: | mux_MineralPropertyInterestsPlantAndEquipmentAndConstructionInProgressTextBlock
Namespace Prefix: | mux_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration