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Mexico
Don David (Arista Mine, Mirador - Alta Gracia Mine)

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 Location:
3.5 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
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Overview

StageProduction
Mine TypeOpen Pit & Underground
Commodities
  • Gold
  • Silver
  • Copper
  • Lead
  • Zinc
Mining Method
  • Overhand Cut & Fill
  • Longhole open stoping
  • Paste backfill
Production Start...
Mine Life6 years (as of Jan 1, 2021)
Don David Gold Mine operations consist of Arista Mine and Aguila Mine.


Owners

Source: p. 7,67
CompanyInterestOwnership
Gold Resource Corp. 100 % Indirect
Gold Resource operations in Oaxaca are conducted through a Mexican subsidiary, Don David Gold Mexico S.A. de C.V. (“DDGM”).

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

Contractors

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Deposit Type

  • Vein / narrow vein
  • Epithermal


Summary:

The Don David Gold Mine (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 principal hosts of mineralization are the Arista and Switchback vein systems, known from drilling and underground workings in the Arista underground mine. The Switchback deposit is approximately 500 m northeast of the Arista deposit. Both vein systems are andesitic host rocks, rhyolite dikes, and structural contacts with the basement sedimentary rocks. The mineralization in these systems is intermediate sulfidation with precious and base metals at economic grades. Both vein ........


Mining Methods

  • Overhand Cut & Fill
  • Longhole open stoping
  • Paste backfill


Summary:

Historically, companies have produced ore from two locations on the Arista mine, the open pit mine and the underground mine. The open pit mineralization is considered low sulfidation, epithermal mineralization primarily of gold with some silver and no base metals. In 2021, mining activities were completed in the open pit, and it will now become the site for filtered dry stack tailings deposition. The Arista underground mine is considered intermediate epithermal mineralization of gold, silver, copper, lead, and zinc. The host rock in the Arista vein system is primarily andesite.

Conventional drill and blast methods are used to extract the Mineral Resources from the Arista mine at the Aguila project.

There are two main mining methods used in the Arista mine: 1) overhand mechanized cut and fill (CAF) and 2) long-hole open stoping (LHOS) with delayed fill. Paste fill, cemented rock fill and uncemented rock fill are applied to long-hole stoping areas in order to increase extraction levels (removal of rib pillars), CAF uses uncemented rock fill as a backfill method.

For the stoping methods, a crosscut from the main ramp intersects the vein, from which an initial drift is excavated perpendicular in both directions along the strike length of the vein. Once the economic limits of the vein have been reached the production cycle starts.

Overhand Mechanized Cut and Fill (CAF)
A CAF stope is started by means of a short (40 to 60 meter) nega ........


Crushing and Grinding
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Processing

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Summary:

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Production:

CommodityProductUnits202120202019201820172016
Gold Metal in conc./ doré koz  ......  Subscription required  ......  Subscription required  ......  Subscription required272828
Silver Metal in conc./ doré oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Copper Metal in concentrate M lbs  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Lead Metal in concentrate M lbs  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Zinc Metal in concentrate M lbs  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Equivalent Metal in conc./ doré koz  ......  Subscription required  ......  Subscription required  ......  Subscription required
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Operational Metrics:

Metrics202120202019201820172016
Tonnes milled  ......  Subscription required  ......  Subscription required693,173 t611,670 t449,177 t450,221 t
Daily milling rate  ......  Subscription required  ......  Subscription required1,980 t1,764 t1,301 t1,295 t
Daily processing capacity  ......  Subscription required  ......  Subscription required1,800 t1,500 t
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Reserves at December 31, 2021:
The Arista Mine cut-off grades for Mineral Reserves are $88/tonne NSR. A breakeven cut-off grade of 2.33 g/t AuEq was used for Alta Gracia Mine Mineral Reserves using gold and silver only to calculate gold equivalencies.

CategoryTonnage CommodityGrade
Proven & Probable 1,538,500 t Gold 1.51 g/t
Proven & Probable 1,538,500 t Silver 73 g/t

Commodity Production Costs:

CommodityUnits202120202019201820172016
Credits (by-product) Gold Equivalent USD  ......  Subscription required -1,638 / oz   -1,219 / oz   -777 / oz  
Total cash costs (sold) Gold Equivalent USD  ......  Subscription required 1,722 / oz   1,294 / oz   1,325 / oz  
Total cash costs (sold) Gold Equivalent USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 84 / oz†   75 / oz†   548 / oz†  
All-in sustaining costs (sold) Gold Equivalent USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 655 / oz†   590 / oz†   845 / oz†  
All-in costs Gold Equivalent USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 617 / oz†   964 / oz†  
† Net of By-Product.
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Operating Costs:

Units202120202019
Total operating costs ($/t milled) USD 144107104

Financials:

Units202120202019201820172016
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 20.6   21.2   11.3  
Capital expenditures M USD  ......  Subscription required 24   21.8   12.4  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 115.3   110.2   83.2  
Operating Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gross profit M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 33.7   42.1   22.4  
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 20.6   20.4   14.7  
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Heavy Mobile Equipment as of December 31, 2021:
HME TypeModelSizeQuantity
Bolter ....................... Subscription required
Drill (long hole) ....................... Subscription required ....................... Subscription required
Jumbo ....................... Subscription required
Loader ....................... Subscription required
Personnel Carrier ....................... Subscription required
Scissor Lift ....................... Subscription required
Scoop Tram 6 cu. yd ....................... Subscription required
Scoop Tram 2.5 cu. yd ....................... Subscription required
Truck (boom) ....................... Subscription required
Truck (fuel / lube) ....................... Subscription required
Truck (underground) 17 cu. m ....................... Subscription required
Truck (underground) 10 cu. m ....................... Subscription required
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Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jun 23, 2022
....................... Subscription required ....................... Subscription required Subscription required Jun 23, 2022
....................... Subscription required ....................... Subscription required Subscription required Jun 23, 2022
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Staff:

Total WorkforceYear
Subscription required 2021

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2019
Annual Report 2018
Press Release 2018
Form 10-K 2017
Annual Report 2016
Form 10-K 2016
Year-end Mineral Reserves 2015
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