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Peru
Tantahuatay (Coimolache) Mine

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 Location:
17 km SW from Bambamarca, Peru

  Regional Office:
Las Begonias 415, 19th Floor, San Isidro
Lima
Peru
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
Processing
  • ROM/dump leach
  • Carbon adsorption-desorption-recovery (ADR)
  • Merrill–Crowe
  • Cyanide (reagent)


Owners

Source: p. 17
CompanyInterestOwnership
Estudios y Proyectos S.A.C. 16 % Indirect
Compania de Minas Buenaventura S.A.A. 40.1 % Indirect
Southern Copper Corp. 44 % Indirect
The Tantahuatay mine is operated by Buenaventura and wholly-owned by Coimolache, in which Buenaventura holds a 40.10% equity interest. The remaining 44 percent held by Southern Copper Corp (SPCC) and 16 percent held by Estudios y Proyectos S.A.C. (ESPRO)

Deposit Type

  • Epithermal


Summary:

Geologically, the Tantahuatay deposits are located at diatremes or volcanic necks in a sequence volcano-magmatic hydrothermal predominant linked to the regional mineralized sector north of Peru.

Tantahuatay consists of five areas of Au-Ag mineralization, contained in material of supergenic oxidation (Mirador Norte, Mirador Sur, Cienaga Norte, Cienaga Sur and Tantahuatay). We have also discovered that below the oxides level of the Cerro Tantahuatay area, there is a significant resource of Cu AuAg in pyrite-enargite ore (sulphides), which is present as disseminations and fracture fillings associated with advanced argillic alteration and multiphase breccia bodies.

This is a high-sulfidation epithermal deposit with outcropping gold and silver mineralization in oxides, related to silicified breccia associated with a pervasive siliceous alteration. Below the oxides level, there is mineralization consisting predominantly of arsenical copper and, to a lesser extent, covellite and supergene chalcocite. This epithermal event overprints a skarn with retrograde alteration identified at-depth, with clean copper mineralization.


Mining Methods

  • Truck & Shovel / Loader


Summary:

The mining is performed in two pits in exploitation: Tantahuatay 2 and Ciénaga Norte. The hauling distances to the leach pad and the barren material deposit, in the case of Tantahuatay 2, are 2.4 km and 0.7 km; and in the case of Ciénaga Norte, 9 km and 0.7 km, respectively. The material is loaded using 3-m3 excavators and transported using trucks with a capacity of 20 m3.


Crushing and Grinding


Processing

  • ROM/dump leach
  • Carbon adsorption-desorption-recovery (ADR)
  • Merrill–Crowe
  • Cyanide (reagent)

Source: Subscription required

Summary:

The metallurgical process at Coimolache consists of leaching the ROM ore (obtained from blasting in the open pit) on the leaching heap using cyanide solution. Two processes are carried out in the plant: Merrill-Crowe (zinc precipitation) and ADR (adsorption, desorption, and regeneration using activated carbon). All of the production at Coimolache is turned into doré bars (gold and silver), which are later sold.

Recoveries & Grades:

CommodityParameter202020192018201720162015
Gold Head Grade, g/t  ......  Subscription required  ......  Subscription required0.580.460.560.5
Silver Head Grade, g/t  ......  Subscription required  ......  Subscription required7.4512.312.313

Production:

CommodityUnits202020192018201720162015
Gold oz  ......  Subscription required  ......  Subscription required173,192151,454150,816144,782
Silver oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in doré.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202020192018201720162015
Daily ore mining rate  ......  Subscription required
Tonnes processed  ......  Subscription required13,878,907 t13,384,291 t13,117,287 t10,624,498 t12,185,425 t
Subscription required - Subscription is required.

Reserves at December 31, 2020:

CategoryTonnage CommodityGradeContained Metal
Proven 58,573,288 t Gold 0.33 g/t 614,820 oz
Proven 58,573,288 t Silver 6.37 g/t 11,992,795 oz
Probable 16,043,633 t Gold 0.31 g/t 159,349 oz
Probable 16,043,633 t Silver 10.45 g/t 5,391,879 oz
Proven & Probable 74,616,921 t Gold 0.33 g/t 774,169 oz
Proven & Probable 74,616,921 t Silver 7.25 g/t 17,384,674 oz

Commodity Production Costs:

CommodityUnits202020192018201720162015
Cash costs (sold) Silver USD  ......  Subscription required  ......  Subscription required 8.39 / oz 6.98 / oz 6.71 / oz 6.59 / oz
Cash costs (sold) Gold USD  ......  Subscription required  ......  Subscription required 675 / oz 517 / oz 492 / oz 489 / oz
Subscription required - Subscription is required.

Financials:

Units202020192018201720162015
Revenue M USD  ......  Subscription required  ......  Subscription required225.4   203.8   198.9   177.3  
After-tax Income M USD  ......  Subscription required  ......  Subscription required25.6   50.8   56.9   38.4  
Subscription required - Subscription is required


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required May 18, 2021
....................... Subscription required ....................... Subscription required Subscription required May 18, 2021
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2020
Subscription required Subscription required Subscription required 2019
Subscription required Subscription required Subscription required 2018
Subscription required 2017
Subscription required 2016

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
Annual Report 2018
Form 20-F 2018
Quarterly Report 2018
Form 20-F 2017
Annual Report 2016
Form 20-F 2016
Subscription required - Subscription is required.

Aerial view:

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