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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
  • Fleet
  • Personnel
  • Filings & News
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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
Production Start...
Mine Life6 years (as of Jan 1, 2022)

Owners

Source: p. 60
CompanyInterestOwnership
Estudios y Proyectos S.A.C. 15.67 % Indirect
Compania de Minas Buenaventura S.A.A. (operator) 40.09 % Indirect
Southern Copper Corp. 44.24 % Indirect
Coimolache is operated by Buenaventura, and wholly owned by Coimolache, in which we hold a 40.095% equity interest.

Compañía Minera Coimolache S.A. (CMC) was established, with 40.09% shareholding by Cía. Minera Buenaventura S.A.A. (BVN), 44.24% by Southern Copper Corporation (SPCC) and 15.67% by ESPRO S.A.C.

Contractors

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Deposit Type

  • Epithermal
  • Porphyry

Summary:

Deposit Type
Tantahuatay is a high-sulfidation epithermal deposit. It presents Au-Ag mineralization in oxides, which are associated with silicified breccias that present mainly silica alteration. Below the oxide level, there is a predominant Cu mineralization with the presence of As, and in smaller quantities, covellite and supergene chalcocite.

The current Tantahuatay open pit (TH1 and TH2) mines Au mineralization within high-sulfidation epithermal alteration and mineralization structures comprising silicified breccias with extensive silica alteration, and laterally grading to pervasive silicification and local alteration of marginal silica alunite. Enargite mineralization is locally discernible within the vughs in the pit and undoubtedly contributed to the high FeO content, becoming more evident below the oxidation base. Wall rocks in the open pit and drill holes consist of volcanic andesite, a subvolcanic andesite dome and a prealteration porphyry with stockwork veins, all showing predominant silica pyrophyllite alteration varying to silica-alunite in the uppermost portions. Fracture-controlled enargite-pyrite mineralization cuts the pyrophyllite alteration in the volcanic rocks and porphyry, as well as quartz stockwork veins, so the porphyry must predate the pervasive pyrophyllite alteration and also the epithermal event. The presence of dickite instead of the usual alunite deposited with enargite is indicative of a lower temperature high-sulfidation epith ........

Mining Methods

  • Truck & Shovel / Loader

Summary:

Coimolache mining company operates the Tantahuatay mine and has planned extract ore, throughout the life of mine, of 5 zones by open pit mining method, that is, the surface mining of economic ore. For this purpose, open pits are designed considering geotechnical parameters, which are inherent to the rock mass quality and ensure the stability of pit slopes. Design parameters are established by sectors and the configuration of double or single bench, bench height, berm length, inter-ramp angle and bench face angle are defined for each sector.

The distribution of open pits throughout the life of mine and these are: Tantahuatay 2 (THY2), Tantahuatay 2 NW extension (THY2 NW Ext. ), Mirador Norte (MN), Mirador Sur (MS), and Cienaga Norte (CN).

Production schedule
The production schedule established over the life of mine (LOM plan) considers the ore production from Tantahuatay 2 (THY2), Tantahuatay Northwest Extension (THY2 NW Ext), Mirador Norte (MN), Mirador Sur (MS), and Cienaga Norte (CN).

The strip ratio of the LOM plan is 0.34, i.e., on average over the life of the mine 0.34 tons of waste rock will be mined to expose and extract one ton of ore.

Reported ore reserves total 65.45 Mt with an average grade of 0.30 g/t Au and 8.42 g/t Ag. On the other hand, the reported waste will total 22.03 Mt. The LOM mining plan will be developed over a period of 6 years.

A total of 469.8 koz Au and 3,054.9 koz Ag are planned to be pr ........

Crushing and Grinding

Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.

^ Guidance / Forecast.

Production:

CommodityUnits2022202120202019201820172016
Gold koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required173151151
Silver koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202220212020201920182017
Total tonnes mined  ......  Subscription required
Ore tonnes mined  ......  Subscription required
Waste  ......  Subscription required
Stripping / waste ratio  ......  Subscription required
Daily ore mining rate  ......  Subscription required  ......  Subscription required  ......  Subscription required
Tonnes processed  ......  Subscription required  ......  Subscription required  ......  Subscription required13,878,907 t13,384,291 t13,117,287 t
Daily processing capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required
^ Guidance / Forecast.
Subscription required - Subscription is required.

Reserves at December 31, 2021:

CategoryTonnage CommodityGradeContained Metal
Probable 65,453,541 t Gold 0.3 g/t 626,398 oz
Probable 65,453,541 t Silver 8.42 g/t 17,716,987 oz
Indicated 38,082,141 t Gold 0.24 g/t 298,849 oz
Indicated 38,082,141 t Silver 13.66 g/t 16,724,755 oz
Inferred 13,076,594 t Gold 0.27 g/t 113,300 oz
Inferred 13,076,594 t Silver 7.11 g/t 2,989,012 oz

Commodity Production Costs:

CommodityUnits202120202019201820172016
Cash costs (sold) Silver USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 8.39 / oz   6.98 / oz   6.71 / oz  
Cash costs (sold) Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 675 / oz   517 / oz   492 / oz  
Subscription required - Subscription is required.

Financials:

Units2022202120202019201820172016
Capital expenditures (planned) M USD  ......  Subscription required
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 225.4   203.8   198.9  
Operating Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 47.5  
Gross profit M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 54.6  
Pre-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 44  
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 25.6   50.8   56.9  
Subscription required - Subscription is required

Heavy Mobile Equipment as of March 15, 2022:
HME TypeModelSizeQuantity
Backhoe ....................... Subscription required
Bulldozer ....................... Subscription required ....................... Subscription required
Bulldozer ....................... Subscription required ....................... Subscription required
Drill (blasthole) ....................... Subscription required
Drill (blasthole) ....................... Subscription required ....................... Subscription required
Excavator ....................... Subscription required 2.4 cu. m ....................... Subscription required
Grader ....................... Subscription required
Loader (FEL) ....................... Subscription required
Truck ....................... Subscription required
Truck (dump) 15 cu. m ....................... Subscription required
Truck (fuel / lube) 5000 gallons ....................... Subscription required
Truck (fuel / lube) ....................... Subscription required
Truck (water) 5000 gallons ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jul 27, 2022
....................... Subscription required ....................... Subscription required Subscription required Jul 27, 2022
....................... Subscription required ....................... Subscription required Subscription required Jul 27, 2022
....................... Subscription required ....................... Subscription required Subscription required Jul 28, 2022
....................... Subscription required ....................... Subscription required Subscription required Jul 28, 2022
....................... Subscription required ....................... Subscription required Subscription required Jul 27, 2022
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2021
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
Pre-Feasibility Study Report 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... 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.

Subscription required - Subscription is required.

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