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Mexico
Mirador - Alta Gracia Mine (Don David Operation)

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 Location:
14 km NW from Quiechapa, Oaxaca, Mexico

  Regional Office:
Calle Las Rosas 339, Col. Reforma
Oaxaca De Juárez
Oaxaca, Mexico
68050
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Overview

StatusTemporary Suspension
Mine TypeUnderground
Commodities
  • Gold
  • Silver
Mining Method
  • Cut & Fill
Production Start...
Operations at the Mirador Alta Gracia mine were temporarily halted in June 2020.


Owners

Source: p. 327
CompanyInterestOwnership
Gold Resource Corp. 100 % Indirect
Gold Resource operations in Oaxaca are conducted through its Mexican subsidiary, Don David Gold Mexico S.A. de C.V. (“DDGM”).

Gold Resource currently has 100% interest in ten properties in the Americas. Six of its properties, including two Operating Properties and four Exploration Properties, are within Oaxaca Mining Unit located in Oaxaca, Mexico, along the San Jose structural corridor.

Contractors

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Deposit Type

  • Epithermal
  • Vein / narrow vein
  • Volcanic hosted


Summary:

The DDGM area is predominantly volcanic rocks of presumed Miocene age, which overlay and intrude into basement rocks consisting of marine sediments. This district's gold and silver mineralization is related to the volcanogenic system and is considered epithermal in character. The DDGM mineralization occurs as structurally controlled epithermal deposits in veins and stockwork zones. The mineralization is associated with gangue minerals such as quartz, calcite, and other minor elements. Primary sulfide mineralization consists of pyrite galena, sphalerite, chalcopyrite, and different minor amounts of argentite and silver sulfosalts. It consists of concentrations of sulfides containing gold, silver, lead, copper, and zinc.

DDGM exploration efforts have been mainly focused on the Arista Project, which contains the Manto Vein, Arista, and Switchback vein deposits, and includes the significant Arista, Baja, and Soledad veins as well as multiple ancillary structures.

The second zone of interest is the Alta Gracia property, where low sulfidation epithermal, predominantly silver mineralized, veins are hosted in andesitic and rhyolitic rocks; this property has been investigated by drilling and surface and underground mapping of historical and recent workings. The Mirador and Independencia vein systems, which DDGM has mined, are one of several predominantly northeast trending vein systems on the property.

The sedimentary and volcanic units mapped at Alta ........


Mining Methods

  • Cut & Fill


Summary:

In 2017, in addition to the Arista underground mine, DDGM completed development of the Mirador Mine at the Alta Gracia Project and began delivering development ore to the Aguila processing facility. Two mine portals were developed to provide access to the Mirador vein. Mine site offices and mobile equipment maintenance facilities were established adjacent to the mine portals. Additionally, a diesel power generation plant, compressed air and a mine water pumping stations were developed. Operations at the Mirador Alta Gracia mine were temporarily halted in June 2020.


Crushing and Grinding


Processing

Flow Sheet: Subscription required

Summary:

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Combined production numbers are reported under Don David Operation

Operational Metrics:

Metrics2020201920182017
Tonnes milled  ......  Subscription required31,962 t15,044 t
Ore tonnes mined  ......  Subscription required6,350 t
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Reserves at December 31, 2021:
A breakeven cutoff grade of 2.36 g/t AuEq was used for mineral reserves and resources at the Mirador Underground Mine using gold and silver only to calculate AuEq.

CategoryTonnage CommodityGrade
Proven 3,000 t Gold 0.85 g/t
Proven 3,000 t Silver 392 g/t
Probable 50,800 t Gold 0.27 g/t
Probable 50,800 t Silver 169 g/t
Proven & Probable 53,800 t Gold 0.3 g/t
Proven & Probable 53,800 t Silver 181 g/t
Measured 24 kt Gold 0.81 g/t
Measured 24 kt Silver 367.95 g/t
Indicated 90 kt Gold 0.61 g/t
Indicated 90 kt Silver 327.18 g/t
Measured & Indicated 114 kt Gold 0.65 g/t
Measured & Indicated 114 kt Silver 335.82 g/t
Inferred 148 kt Gold 0.62 g/t
Inferred 148 kt Silver 295.61 g/t



Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jun 11, 2022
....................... Subscription required ....................... Subscription required Subscription required Jun 11, 2022
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Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2019
Corporate Presentation 2018
Form 10-K 2017
Year-end Mineral Reserves 2015
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