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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
Phone  ...  Subscription required
Fax51-1-2645373
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
Processing
  • Flotation


Owners

Source: p. 45
CompanyInterestOwnership
Compania de Minas Buenaventura S.A.A. 61.43 % Indirect
The Colquijirca and Marcapunta Norte mines are wholly-owned by El Brocal. Currently, Compania de Minas Buenaventura S.A.A owns 61.43% of El Brocal through both direct and indirect ownership interests.

Deposit Type

  • Vein / narrow vein


Summary:

The Colquijirca deposit (Tajo Norte) is structurally located within asymmetric synclines and anticlines, whose flanks are Principal-Mercedes-Chocayoc-La Llave-La Pampa; and stratigraphically located in the Calera Formation (Lower Tertiary-Eocene), middle and upper members. The base metal zone (Zn + Pb-Ag) is the outermost halo of mineralization (cordillera-type) and, by volume, the zone of greatest economic importance. Its mineralogy consists of sphalerite and galena as vein ores, which occur as fracture filling and cavities, disseminations, and massive replacements. The gangue consists of pyrite, specular hematite, magnetite, kaolin, barite, siderite, ankerite-dolomite, and fluorite, less commonly. All of them occur as fracture filling and cavities. Native silver as filigree in cavities, and in association with siderite, has been observed near the transition zone. It is also possible to observe the occurrence of chalcopyrite-galena-dickite as filling in fractures and replacement zones.


Mining Methods

  • Truck & Shovel / Loader


Summary:

Tajo Norte is an open pit operation that exploits zinc-lead-silver ores.

It is a conventional truck and shovel operation, through a contractor. The height of a workbench is 6 m and the equipment used includes DM45 and DML drilling rigs. Loading are by hydraulic excavators EC950E (5.6 m3) and 374D (4.6 m3) and hauling is by G500 B8X4 trucks (24.5 m3). For 2021 we are planning to use 8 excavators and 48 trucks. To maximize mine production, Tajo Norte mine employs a fleet management system that supports the transmission and receipt of data across the mobile fleet, and supports the collection of data which is input directly by equipment operators.


Crushing and Grinding


Processing

  • Flotation

Source: Subscription required

Summary:

The ore from Tajo Norte is treated at Plant 2, which uses the selective flotation process to achieve the concentration of the economic mineralization. It includes the crushing, washing, sorting, milling, conditioning, flotation, and filtering processes, as well as the respective tailings storage yards. Given the equipment characteristics and layout, the plant has the ability to beneficiate silver, lead, and zinc ores. It has direct access to a railway, which it uses to transport the concentrates to the port of El Callao.

Treatment capacity: The El Brocal processing plant has a total capacity of 20,000 MTD, which is shared by the ore from Marcapunta and Tajo Norte.

Recoveries & Grades:

CommodityParameter202020192018201720162015
Zinc Recovery Rate, %  ......  Subscription required  ......  Subscription required59.359.361.162
Zinc Head Grade, %  ......  Subscription required  ......  Subscription required2.742.742.672.77
Lead Recovery Rate, %  ......  Subscription required  ......  Subscription required56.756.747.658.7
Lead Head Grade, %  ......  Subscription required  ......  Subscription required1.131.130.771.03
Copper Recovery Rate, %  ......  Subscription required  ......  Subscription required
Copper Head Grade, %  ......  Subscription required  ......  Subscription required
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required
Gold Head Grade, g/t  ......  Subscription required  ......  Subscription required
Silver Recovery Rate, %  ......  Subscription required  ......  Subscription required65.372.359.667.5
Silver Head Grade, oz/t  ......  Subscription required  ......  Subscription required1.131.320.881.34

Production:

CommodityUnits202020192018201720162015
Silver oz  ......  Subscription required  ......  Subscription required2,518,3333,031,7961,835,2422,811,391
Zinc t  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Lead t  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Copper t  ......  Subscription required
Gold oz  ......  Subscription required
All production numbers are expressed as metal in concentrate.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202020192018201720162015
Ore tonnes mined  ......  Subscription required3,407,914 t3,429,618 t3,169,908 t3,513,959 t3,101,851 t
Subscription required - Subscription is required.

Reserves at December 31, 2020:

CategoryTonnage CommodityGradeContained Metal
Proven & Probable 41,600 kt Silver 1.26 oz/t 52,521 koz
Proven & Probable 9,840 kt Zinc 2.15 % 211 kt
Proven & Probable 9,840 kt Lead 1 % 98 kt
Proven & Probable 31,760 kt Copper 1.48 % 469 kt
Proven & Probable 31,760 kt Gold 0.007 oz/t 211 koz
Measured & Indicated 6,649 kt Silver 0.73 oz/t 4,856 koz
Measured & Indicated 5,588 kt Zinc 3.174 % 177 kt
Measured & Indicated 5,588 kt Lead 0.971 % 54 kt
Measured & Indicated 1,061 kt Copper 1.008 % 11 kt
Measured & Indicated 1,061 kt Gold 0.004 oz/t 4 koz

Commodity Production Costs:

CommodityUnits202020192018201720162015
Cash costs (sold) Zinc USD  ......  Subscription required  ......  Subscription required 1,569 / t 1,915 / t 1,808 / t 1,601 / t
Cash costs (sold) Copper USD  ......  Subscription required
Subscription required - Subscription is required.


Heavy Mobile Equipment as of December 31, 2020:
HME TypeModelSizeLeased or
Contractor
Drill (blasthole) ....................... Subscription required Leased
Drill (blasthole) ....................... Subscription required Leased
Excavator ....................... Subscription required 5.6 cu. m Leased
Excavator ....................... Subscription required 4.6 cu. m Leased
Truck (haul) ....................... Subscription required 24.5 cu. m Leased
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required May 19, 2021
....................... Subscription required ....................... Subscription required Subscription required May 19, 2021
....................... Subscription required ....................... Subscription required Subscription required May 19, 2021
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... 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.

Aerial view:

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