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Mexico
Arista Mine (Oaxaca Mining Unit)

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 Location:
3 km N from Quiechapa, Oaxaca, Mexico

  Regional Office:
Calle Las Rosas 339 0
Oaxaca De Juárez
Oaxaca, Mexico
68050
Phone  ...  Subscription required
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
  • Silver
  • Copper
  • Zinc
  • Lead
Mining Method
  • Overhand Cut & Fill
  • Longhole stoping
Processing
  • Gravity separation
  • Flotation
  • Counter current decantation (CCD)
  • Agitated tank (VAT) leaching
  • Merrill–Crowe
  • Cyanide (reagent)


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 area is dominated by multiple volcanic domes of various scales that compose the district geology. These volcanogenic features are superimposed 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 Project mineralization occurs as structurally-controlled epithermal deposits in veins and stockwork zones consisting of concentrations of sulfides containing gold, silver, lead, copper, and zinc, associated with gangue minerals such as quartz, calcite, and other minor elements. Primary sulfide mineralization consists of pyrite, galena, sphalerite, chalcopyrite associated with minor amounts of argentite and silver sulfosalts.

GRC’s exploration investigations have been mainly focused on the Aguila open pit and Arista underground mine areas. These areas include the significant Aguila, Arista, Baja and Aire veins as well as other ancillary mineralized structures. A potential new area of mineralization, referred to as “Switchback”, has been identified approximately 500 meters northeast of the Arista deposit, for which drill results showed multiple veins over a 40 to 100 meter wide alteration zone containing numerous mineralized veins associated with rhyolite dikes and hosted in andesite, similar to the Arista vein system. Other mineralized zones and properties have been investigated, including some preliminary drilling in areas such as Escondida, Chacal and Salina Blanca on the Aguila Project, and the Margaritas, Alta Gracia and Rey properties.

The Arista Mine was expanded in 2016 with the development of the Switchback vein system. [2019 Annial Report, P.6]


Mining Methods

  • Overhand Cut & Fill
  • Longhole stoping


Summary:

There are two main mining methods used in the Arista underground mine: 1) overhand mechanized cut and fill (CAF) and 2) long-hole open stoping (LHOS) with delayed fill.


Crushing and Grinding


Processing

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

Flow Sheet: Subscription required

Summary:

Gold Resource Corporation currently processes all of the Arista underground mine ore through the flotation circuit at the Company's El Aguila mill. The plant was built near the mine site and consists of two separate production circuits: a differential flotation circuit (sulphide ores) and an agitated leach circuit (oxide ores). The current nominal capacity of the flotation circuit is 1,500 tonnes per day, while the agitated leach circuit has a nominal capacity of 300 tonnes per day.

The flotation circuit produces three types of high-grade concentrates: a copper concentrate with gold-silver; a lead concentrate with gold-silver; and a zinc concentrate with gold-silver. All concentrates are marketed to a broker in México.

In 2014 we completed a doré processing facility. The Aguila processing facility is flexible in its ability to process several types of mineralization. It has a differential flotation section capable of processing polymetallic ore and producing up to ........

Recoveries & Grades:

CommodityParameter2016201520142013
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Head Grade, g/t 2.132.473.213.72
Silver Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Head Grade, g/t 139203296326
Copper Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Copper Head Grade, % 0.290.40.430.38
Zinc Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Zinc Head Grade, % 3.784.044.212.95
Lead Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Lead Head Grade, % 1.211.371.571.24
Subscription required - Subscription is required.

Production:

CommodityUnits2016201520142013
Gold oz 27,62829,64435,55233,942
Silver oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Copper t  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Zinc t  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Lead t  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Equivalent oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in concentrate.

Operational Metrics:

Metrics201920182017201620152014
Tonnes milled  ......  Subscription required  ......  Subscription required450,221 t413,626 t375,623 t
Daily milling rate  ......  Subscription required  ......  Subscription required  ......  Subscription required1,295 t1,220 t1,111 t
Daily milling capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required1,500 t
Subscription required - Subscription is required.

Reserves at December 31, 2019:

CategoryTonnage CommodityGradeContained Metal
Proven 2,591,700 t Gold 2.04 g/t 169,600 oz
Proven 2,591,700 t Silver 112 g/t 9,295,900 oz
Proven 2,591,700 t Copper 0.4 %
Proven 2,591,700 t Zinc 4.9 %
Proven 2,591,700 t Lead 1.7 %
Proven 2,591,700 t Gold Equivalent 3.43 g/t 285,900 oz
Probable 163,700 t Gold 1.47 g/t 7,800 oz
Probable 163,700 t Silver 172 g/t 906,400 oz
Probable 163,700 t Copper 0.3 %
Probable 163,700 t Zinc 4 %
Probable 163,700 t Lead 1.3 %
Probable 163,700 t Gold Equivalent 3.62 g/t 19,000 oz
Proven & Probable 2,755,400 t Gold 2 g/t 177,400 oz
Proven & Probable 2,755,400 t Silver 115 g/t 10,202,300 oz
Proven & Probable 2,755,400 t Copper 0.4 %
Proven & Probable 2,755,400 t Zinc 4.8 %
Proven & Probable 2,755,400 t Lead 1.7 %
Proven & Probable 2,755,400 t Gold Equivalent 3.44 g/t 304,900 oz

Commodity Production Costs:

CommodityUnits2016201520142013
Credits (by-product) Gold Equivalent USD -777 / oz -559 / oz -576 / oz -307 / oz
Total cash costs (sold) Gold Equivalent USD 1,325 / oz 1,076 / oz 1,025 / oz 933 / oz
Total cash costs (sold) Gold Equivalent USD 548 / oz† 517 / oz† 449 / oz† 626 / oz†
All-in sustaining costs (sold) Gold Equivalent USD 970 / oz† 1,016 / oz†
All-in costs Gold Equivalent USD 1,137 / oz† 1,236 / oz†
† Net of By-Product.

Operating Costs:

Units2015
Total operating costs ($/t milled) USD 76

Financials:

Units2016201520142013
Capital expenditures M USD  ......  Subscription required 26.7   17.9   6.7  
Revenue M USD  ......  Subscription required 92.7   115.4   125.8  
Gross profit M USD  ......  Subscription required 30.3   58.3   58.3  
After-tax Income M USD  ......  Subscription required 3.06   15   5.3  


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required May 29, 2020
....................... Subscription required ....................... Subscription required Subscription required May 29, 2020
....................... Subscription required ....................... Subscription required Subscription required May 29, 2020
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2018
Form 10-K 2017
Corporate Presentation 2016
Form 10-K 2016
Annual Report 2015
Annual Report 2014
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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