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Peru
Tambomayo Mine

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 Location:
109 km NW from Arequipa, 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 TypeUnderground
Commodities
  • Gold
  • Silver
  • Zinc
  • Lead
Mining Method
  • Bench & Fill
  • Overhand Cut & Fill
  • Sub-level stoping
  • Cemented backfill
Production Start...
Mine Life2024


Owners

Source: p. 41
CompanyInterestOwnership
Compania de Minas Buenaventura S.A.A. (operator) 100 % Indirect
Tambomayo is an underground mine that is wholly owned and operated by Compania de Minas Buenaventura S.A.A..

Contractors

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Deposit Type

  • Mesothermal
  • Epithermal
  • Vein / narrow vein


Summary:

Deposit Type
The Tambomayo deposit is a low sulfidation epithermal-type deposit with gold and silver mineralization in the upper levels and occurrence of lead and zinc and base metals at depth. Structures in the deposit are phyllonian and rosary type with fracture filling.

Based on observations in underground workings and other characteristics, it is inferred that the mineralization was emplaced at very moderate to low temperatures (Mesothermal to Epithermal).

It is hydrothermal because the hot aqueous solutions originated as the last phase of a magmatic differentiation when exiting through the pre-existing fractures. They gave rise to alterations in the wall rock such as: kaolinization, pyritization, chloritization, etc., and finally the deposition of ore solutions took place.

It is mesothermal and epithermal due to the presence of medium temperature minerals such as galena, sphalerite, argentite, etc., although the pyrite, chalcopyrite and quartz minerals are of a different temperature.

Mineralization
The vein-type mineralization is emplaced in the Tambomayo volcanics, and related to intrusives, subvolcanic bodies and dikes in Miocene tuffs (Swanson, 1988).

The mineralization is mainly Au and Ag, with minor amounts of Pb, Zn and some Cu; this primarily presents as primary sulfide ore, with some secondary species generally occurring in outcrops.

The mineralogical filling of veins, according to their ........


Mining Methods

  • Bench & Fill
  • Overhand Cut & Fill
  • Sub-level stoping
  • Cemented backfill


Summary:

The Tambomayo mining unit uses Transverse Sublevel Stoping (SLS), Bench and Fill (B&F), and Overhand Cut and Fill (OCF) mining to produce approximately 45,000 tons of ore per month (1,500 tpd).

At the operational level, the mine has been divided into four zones:
- 100 (Mirtha);
- 200 (Paola);
- 300 (Paola Norte).

The most important local faults in the zones adjacent to the mineralization zone correspond to Fatima, Carmen, and Norte faults, which have a NW strike and dip in NE direction.

In recent years, up to three underground mining methods have been used:
- Bench & Fill (B&F): 10-meter drill holes with detrital fill in longitudinal stopes.
- Sublevel Stopping (SLS): long holes (the entire pit) with detrital fill, in transverse stopes.
- Overhand Cut and Fill (OCF): Drilling in breasting, leaving a 0.50 m free face at the bottom.

A. Bench & Fill (B&F)
To apply this method, a ramp is built from which infrastructure such as bypass, crosscuts, connections, drifts, ore passes, and loading rooms will be developed.

Every 100 meters in height, starting from the ramp, a 4m x 4m section bypass is built parallel to the vein in the footwall, some 40 meters away from the vein, to serve as transit works for haul trucks and increase the operation’s dynamism.

From the bypass or intermediate sublevels, crosscuts are built with a 3.5 m by 3.5 m section perpendicular to the vein to generate ac ........


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.

^ Guidance / Forecast.

Production:

CommodityProductUnits202220212020201920182017
Gold Metal in conc./ doré oz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required129,17264,175
Silver Metal in conc./ doré oz  ......  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
Lead Metal in concentrate t  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Zinc Concentrate kt  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202220212020201920182017
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required640,914 t557,364 t332,193 t
Daily milling capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required2,000 t1,500 t
Daily ore mining rate  ......  Subscription required  ......  Subscription required  ......  Subscription required
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required640,914 t557,364 t332,193 t
^ Guidance / Forecast.
Subscription required - Subscription is required.

Reserves at December 31, 2021:

CategoryTonnage CommodityGradeContained Metal
Proven & Probable 1,388,344 t Gold 3.01 g/t 134,490 oz
Proven & Probable 1,388,344 t Silver 162.08 g/t 7,234,698 oz
Proven & Probable 1,388,344 t Zinc 1.41 % 19,608 t
Proven & Probable 1,388,344 t Lead 0.94 % 13,081 t
Measured & Indicated 557,424 t Gold 2.86 g/t 51,170 oz
Measured & Indicated 557,424 t Silver 145.64 g/t 2,610,136 oz
Measured & Indicated 557,424 t Zinc 1.6 % 8,891 t
Measured & Indicated 557,424 t Lead 0.99 % 5,509 t
Inferred 120,272 t Gold 1.73 g/t 6,678 oz
Inferred 120,272 t Silver 261.39 g/t 1,010,742 oz
Inferred 120,272 t Zinc 1.08 % 1,297 t
Inferred 120,272 t Lead 0.79 % 946 t

Commodity Production Costs:

CommodityUnits20212020201920182017
Cash costs (sold) Lead USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 1,186 / t   1,635 / t  
Cash costs (sold) Zinc USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 1,551 / t   2,057 / t  
Cash costs (sold) Silver USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 7.77 / oz   9.43 / oz  
Cash costs (sold) Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 626 / oz   671 / 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 18.9   131.1   230.2  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 225.3   119  
Operating Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 7.7   -2.8  
Gross profit M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 32.9   12.1  
Pre-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 7.7   -3.2  
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 7   -3.7  
Subscription required - Subscription is required



Heavy Mobile Equipment as of March 15, 2022:
HME TypeModelQuantityLeased or
Contractor
Bolter ....................... Subscription required ....................... Subscription required
Bolter ....................... Subscription required ....................... Subscription required Leased
Bolter ....................... Subscription required ....................... Subscription required Leased
Drill (long hole) ....................... Subscription required ....................... Subscription required
Drill (long hole) ....................... Subscription required ....................... Subscription required
Jumbo ....................... Subscription required ....................... Subscription required Leased
Jumbo ....................... Subscription required ....................... Subscription required Leased
Scaler ....................... Subscription required ....................... Subscription required Leased
Scoop Tram ....................... Subscription required ....................... Subscription required
Scoop Tram ....................... Subscription required ....................... Subscription required
Scoop Tram ....................... Subscription required ....................... Subscription required Leased
Telescopic Handler ....................... Subscription required ....................... Subscription required Leased
Truck ....................... Subscription required Leased
Truck (dump) ....................... Subscription required Leased
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 Aug 5, 2022
....................... Subscription required ....................... Subscription required Subscription required Jul 27, 2022
....................... Subscription required ....................... Subscription required Subscription required Jul 26, 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 2019
................................... Subscription required 2019
Annual Report 2018
Form 20-F 2018
Press Release 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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