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Peru
Tajo Norte Mine (Colquijirca (El Brocal) Operation)

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 Location:
164 km NE from Lima, Peru

  Regional Office:
Las Begonias 415, Piso 19, San Isidro
Lima
Peru
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WebsiteWeb
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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
  • Silver
  • Zinc
  • Lead
  • Copper
  • Gold
Mining Method
  • Truck & Shovel / Loader
Mine Life2032


Owners

Source: p. 33
CompanyInterestOwnership
Sociedad Minera El Brocal S.A.A. 38.57 % Indirect
Compania de Minas Buenaventura S.A.A. 61.43 % Indirect
Colquijirca is held within the operating entity, Sociedad Minera El Brocal (El Brocal), of which Buenaventura is a 61.43% owner with the remaining 38.57% ownership controlled by Sociedad Minera EL Brocal S.A.A.

Contractors

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Deposit Type

  • Vein / narrow vein
  • Carbonate hosted
  • Epithermal
  • Porphyry


Summary:

The mineral deposits of the Colquijirca district belong to a member of the family of porphyry copper (Cu) related deposits known as Cordilleran deposits. These types of deposits, which are generally formed in the upper parts of a porphyry Cu, are fundamentally characterized by prominent zoning with internal parts that are dominated by Cu and external zones where Zn, Pb and Ag are the main economically-interesting elements. In the case of the Colquijirca district, and specifically the area between the Marcapunta Norte and Colquijirca sectors, such zoning generally consists of three zones, which mineralogically consist mainly of enargite in the internal parts; chalcopyrite in the intermediate parts; and sphalerite and galena in the external parts (El Brocal, 2021).

Due to the advance of stoping over the years, the Colquijirca deposit is currently exposed, which facilitates the geological identification of the Tertiary basin. Asymmetric anticlines and synclines composed of carbonate and detrital rocks, attributed to the Eocene-Oligocene Calera Formation, can be found and considered as the host of mineralization. The deposit also presents volcano-clastic intercalations (ash tuffs), which is evidence of volcanic activity that was contemporaneous to sedimentation. In addition, with the review of 5 drillholes, the Shuco conglomerate sequence of the upper Eocene has been identified in depth, which underlies Lower Calera and overlies in depositional contact with the Mitú sa ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

Tajo Norte, an open-pit operation that produces silver, lead, zinc and copper ores. Open pit operations: 1.Tajo Norte 2.Tajo Sur The following design parameters have been considered for the open pit operation: - Bench height: 6 m. - Berm width: variable between 5 and 8 m. - Ramp width: considering equipment width, safety distances, and safety berm, the open pit have ramp widths of 12 m with a 10% slope. - Optimum turning radius according to the equipment fleet is 6.4 m. - Minimum loading width considering the excavator and the minimum spaces to carry out operational activities is 20 m. However, one excavator is expected to work with two trucks. As such, the estimated width can be up to 60 m. Open pit mining production: 9,500 tpd (2022 – 2032).


Crushing and Grinding
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Processing

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Summary:

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Production:

CommodityProductUnits202120202019201820172016
Silver Metal in concentrate oz  ......  Subscription required  ......  Subscription required  ......  Subscription required2,518,3333,031,7961,835,242
Zinc 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
Lead Metal in concentrate t  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Copper Metal in concentrate t  ......  Subscription required  ......  Subscription required
Copper Concentrate kt  ......  Subscription required  ......  Subscription required
Gold Metal in concentrate oz  ......  Subscription required  ......  Subscription required
Lead-Silver Concentrate kt  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Operational Metrics:

Metrics202220212020201920182017
Daily ore mining rate  ......  Subscription required
Tonnes processed  ......  Subscription required  ......  Subscription required  ......  Subscription required3,407,914 t
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required3,407,914 t3,429,618 t3,169,908 t
^ Guidance / Forecast.
Subscription required - Subscription is required.

Reserves at December 31, 2021:

CategoryTonnage CommodityGradeContained Metal
Proven & Probable 8,459 kt Silver 1.27 oz/t 44,088 koz
Proven & Probable 8,459 kt Zinc 2.19 % 185 kt
Proven & Probable 8,459 kt Lead 1.08 % 92 kt
Proven & Probable 8,459 kt Copper 1.7 % 449 kt
Proven & Probable 8,459 kt Gold 0.007 oz/t 185 koz
Measured & Indicated 3,582 kt Silver 0.89 oz/t 3,191 koz
Measured & Indicated 3,582 kt Zinc 3.39 % 81 kt
Measured & Indicated 3,582 kt Lead 1.06 % 25 kt
Measured & Indicated 3,582 kt Copper 1.75 % 21 kt
Measured & Indicated 3,582 kt Gold 0.004 oz/t 4 koz

Commodity Production Costs:

CommodityUnits202120202019201820172016
Cash costs (sold) Lead USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Cash costs (sold) Zinc USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 1,569 / t   1,915 / t   1,808 / t  
Cash costs (sold) Copper USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.



Heavy Mobile Equipment as of March 15, 2022:
HME TypeModelSizeQuantityLeased or
Contractor
Backhoe 1 cu. m ....................... Subscription required Leased
Backhoe ....................... Subscription required 1 cu. m ....................... Subscription required Leased
Drill (blasthole) ....................... Subscription required Leased
Excavator ....................... Subscription required 1.8 cu. m ....................... Subscription required Leased
Excavator ....................... Subscription required 5.6 cu. m ....................... Subscription required Leased
Excavator 5.6 cu. m ....................... Subscription required Leased
Excavator 4.6 cu. m ....................... Subscription required Leased
Excavator 1.8 cu. m ....................... Subscription required Leased
Grader ....................... Subscription required Leased
Loader (FEL) 4 cu. m ....................... Subscription required Leased
Loader (FEL) ....................... Subscription required 4 cu. m ....................... Subscription required Leased
Truck (dump) ....................... Subscription required 20 cu. m ....................... Subscription required Leased
Truck (dump) 24.5 cu. m ....................... Subscription required Leased
Truck (dump) 20 cu. m ....................... Subscription required Leased
Truck (fuel / lube) ....................... Subscription required Leased
Truck (fuel / lube) 5000 gallons ....................... Subscription required Leased
Truck (water) 5000 gallons ....................... Subscription required Leased
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jul 22, 2022
....................... Subscription required ....................... Subscription required Subscription required Jul 22, 2022
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Corporate Filings & Presentations:

DocumentYear
Technical Report 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
Annual Report 2018
Annual Report 2018
Form 20-F 2018
Annual Report 2017
Form 20-F 2017
Annual Report 2016
Form 20-F 2016
Subscription required - Subscription is required.

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