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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:
Av. Javier Prado Oeste #2173, San Isidro
Lima
Peru
Phone  ...  Subscription required
Fax51-1-2645373
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Silver
  • Zinc
  • Lead
  • Copper
Mining Method
  • Truck & Shovel / Loader
Processing
  • Flotation


Owners

Source: p. 60
CompanyInterestOwnership
Compania de Minas Buenaventura S.A.A. 61.43 % Indirect
The Colquijirca (also known as Tajo Norte) and Marcapunta Norte mines are wholly-owned by El Brocal. Compania de Minas Buenaventura S.A.A aggregate direct and indirect equity interest in El Brocal was 61.43% at December 31, 2018.

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:

The Colquijirca (also known as Tajo Norte) and Marcapunta Norte mines are wholly-owned by El Brocal.

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

The drills make boreholes measuring 6.5 m deep and 6.74 m in diameter, in a 5 x 5 m grid. Once the terrain has been drilled, the explosives are placed, carrying out the blasting process to stir up the rock. An excavator allows for better selectivity of the ore to be transported to the concentrating plant, 8 km away, using dump trucks with a 35-MT payload. For loading, a power shovel with a bucket capacity of 10 m3 is used. The barren material is transported to the waste or waste ore deposit located 1.8 km away, using trucks with a 50-MT payload.


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:

CommodityParameter20192018201720162015
Silver Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Head Grade, % 1.381.131.320.881.34
Zinc Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Zinc Head Grade, % 2.422.742.742.672.77
Lead Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Lead Head Grade, % 1.261.131.130.771.03
Subscription required - Subscription is required.

Production:

CommodityUnits20192018201720162015
Silver oz  ......  Subscription required2,518,3333,031,7961,835,2422,811,391
Zinc t  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Lead t  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in concentrate.
Subscription required - Subscription is required.

Operational Metrics:

Metrics20192018201720162015
Ore tonnes mined  ......  Subscription required3,429,618 t3,169,908 t3,513,959 t3,101,851 t
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Reserves at December 31, 2019:

CategoryTonnage CommodityGradeContained Metal
Proven & Probable 42,216 kt Silver 1.08 oz/t 45,581 koz
Proven & Probable 14,756 kt Zinc 2.52 % 371 kt
Proven & Probable 14,756 kt Lead 1.17 % 173 kt
Proven & Probable 27,460 kt Copper 1.71 % 470 kt
Total Resource 11,629 kt Silver 0.45 oz/t 5,252 koz
Total Resource 10,549 kt Zinc 3.15 % 332 kt
Total Resource 10,549 kt Lead 0.97 % 102 kt
Total Resource 1,080 kt Copper 1.27 % 14 kt


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 21, 2020
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Corporate Filings & Presentations:

DocumentYear
Annual Report 2018
Annual Report 2018
Form 20-F 2018
Annual Report 2017
Form 20-F 2017
Annual Report 2016
Form 20-F 2016
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Aerial view:

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