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Mexico
Oaxaca Mining Unit (Arista Mine, Mirador Mine)

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 Location:
3.5 km NW from Quiechapa, Oaxaca, Mexico

  Regional Office:
Calle Las Rosas 339
Oaxaca De Juárez
Oaxaca, Mexico
68050
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WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit / Underground
Commodities
  • Gold
  • Silver
  • Copper
  • Lead
  • Zinc
Mining Method
  • Truck & Shovel / Loader
  • Overhand Cut & Fill
  • Longhole open stoping
Processing
  • Gravity separation
  • Flotation
  • Counter current decantation (CCD)
  • Agitated tank (VAT) leaching
  • Merrill–Crowe
  • Cyanide (reagent)
Mine Life4.5 years (as of Jan 1, 2018)
Latest NewsGold Resource Corporation Confirms Vein Structures Up to 250 Meters Above Current Production Area at the Don David Mine in Mexico...     February 2, 2021


Owners

Source: p. 6, 20
CompanyInterestOwnership
Gold Resource Corp. 100 % Indirect
Gold Resource operations in Oaxaca are conducted through our 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.

Deposit Type

  • Epithermal
  • Vein / narrow vein


Summary:

The Aguila Project is located in the San Jose de Gracia Mining District in Oaxaca. Multiple volcanic domes of various scales, and probably non-vented intrusive domes, dominate the district geology. These volcanogenic features are imposed on a pre-volcanic basement of sedimentary rocks. Gold and silver mineralization in this district is related to the manifestations of this classic volcanogenic system and is considered epithermal in character.

The Aguila open pit mineralization is considered low sulfidation, epithermal mineralization primarily of gold with some silver and no base metals. 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.

As of December 31, 2016, proven and probable reserves had been established for the Mirador Underground Mine on Alta Gracia property. In July 2017, mine development reached the economic ore zone of the Mirador vein and mining began.

The sedimentary and volcanic units mapped at Alta Gracia are similar to those observed at the Aguila project. The district is dominated by Tertiary-age rhyolite flows and tuffs which are underlain by andesite flows and tuff. Granodiorite and felsic intrusives are observed to outcrop to north and east of the Mirador mine. Known vein occurrences at Alta Gracia are mainly hosted in andesite and rhyolite. The veins currently being mined at Alta Gracia are considered low sulfidation epithermal mineralization with economic values only for gold and silver.


Mining Methods

  • Truck & Shovel / Loader
  • Overhand Cut & Fill
  • Longhole open stoping


Summary:


Crushing and Grinding


Processing

  • Gravity separation
  • Flotation
  • Counter current decantation (CCD)
  • Agitated tank (VAT) leaching
  • Merrill–Crowe
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

The Aguila processing facility produces metal concentrates and doré from ore mined from both the Arista and Mirador Mines. The plant was built near the mine site and consists of both a differential flotation circuit and an agitated leach (oxide) circuit. Late in 2013, as part of the flotation plant expansion from 850 tpd to a nominal 1,500 tpd, two Knelson gravity concentrators were installed. In 2014, a Gekko Intensive Leach Reactor and Electrowinning Circuit was installed to upgrade the gravity concentrate to doré. In 2015, 40 percent of the gold production from the Aguila plant was produced as doré.

The products from the flotation circuit in the plant are four types of high-grade concentrates: copper concentrate with gold silver; lead concentrate with gold-silver; zinc concentrate with gold-silver and highgrade gravity concentrate which is subsequently smelted and poured into gold silver bullion (doré) bars. Concentrates are sold to two subsidiaries of the Trafigura Gr ........

Recoveries & Grades:

CommodityParameter201720162015
Gold Recovery Rate, % 858990
Gold Head Grade, g/t 2.292.13
Silver Recovery Rate, % 929293
Silver Head Grade, g/t 134139
Copper Recovery Rate, % 757880
Copper Head Grade, % 0.340.29
Lead Recovery Rate, % 757474
Lead Head Grade, % 1.61.21
Zinc Recovery Rate, % 838483
Zinc Head Grade, % 4.393.78

Production:

CommodityProductUnits2019201820172016201520142013
Gold Metal in conc./ doré oz  ......  Subscription required26,83828,11727,62829,64435,55233,942
Silver Metal in conc./ doré oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Copper Metal in concentrate t  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Lead Metal in concentrate t  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Zinc Metal in concentrate t  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Equivalent Metal in conc./ doré oz  ......  Subscription required
Subscription required - Subscription is required.

Operational Metrics:

Metrics2019201820172016201520142011
Tonnes milled  ......  Subscription required  ......  Subscription required449,177 t450,221 t413,626 t375,623 t214,215 t
Daily milling rate  ......  Subscription required  ......  Subscription required1,301 t1,295 t1,220 t1,100 t
Daily processing capacity  ......  Subscription required  ......  Subscription required1,800 t1,500 t
Subscription required - Subscription is required.

Reserves at December 31, 2018:

CategoryTonnage CommodityGradeContained Metal
Proven & Probable 3,077,200 t Gold 1.82 g/t 180,300 oz
Proven & Probable 3,077,200 t Silver 127 g/t 12,591,300 oz
Proven & Probable 3,077,200 t Gold Equivalent 3.5 g/t 346,600 oz

Commodity Production Costs:

CommodityUnits2019201820172016
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† 84 / oz† 75 / oz† 548 / oz†
All-in sustaining costs (sold) Gold Equivalent USD  ......  Subscription required† 655 / oz† 590 / oz† 845 / oz†
All-in costs Gold Equivalent USD 617 / oz† 964 / oz†
† Net of By-Product.
Subscription required - Subscription is required.

Financials:

Units2019201820172016
Sustaining costs M USD  ......  Subscription required20.6  21.2   11.3  
Capital expenditures M USD  ......  Subscription required24  21.8   12.4  
Revenue M USD  ......  Subscription required115.31  110.2   83.2  
Gross profit M USD 33.7  42.1   22.4  
After-tax Income M USD  ......  Subscription required20.6  20.4   14.7  
Subscription required - Subscription is required


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Mar 5, 2021
....................... Subscription required ....................... Subscription required Subscription required Mar 5, 2021
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... 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
Subscription required - Subscription is required.

News:

NewsDate
Gold Resource Corporation Confirms Vein Structures Up to 250 Meters Above Current Production Area at the Don David Mine in Mexico... February 2, 2021
Gold Resource Corporation granted government approval to restart its Oaxaca Mining Unit May 27, 2020

Aerial view:

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