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

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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
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit / Underground
Commodities
  • Silver
  • Gold
  • Copper
  • Zinc
  • Lead
  • Lead-Silver
Mining Method
  • Truck & Shovel / Loader
  • Sub-level stoping
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 mine consists of three important polymetallic deposits: (1) Tajo Norte–Smelter, which contains zinc, silver and lead; (2) Marcapunta, which contains an auriferous mineralization in breccia oxides and an arsenic copper enargite mineralization as a continuation of the mineralized mantles of the Marcapunta Norte mine; and (3) San Gregorio massive zinc deposit, which contains zinc.

San Gregorio is located four kilometers south of the Colquijirca mine and consists of carbonate-hosted epithermal zinc-lead deposits.

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.

At Marcapunta Norte, mineralization is stratiform, in both the mineralized blankets emplaced in the limestone of the Calera Medio Formation, and in the mineralized breccia located in the unit below said formation. The vein of ore consists of a massive replacement of sulfides and the filling of open spaces, for which reason it has been classified as a cordillera deposit tied to the Marcapunta volcanic complex. Mineralization consists of a vein of arsenical copper (enargite) with Ag-Au values, with gangues of pyrite, quartz, and alunite.


Mining Methods

  • Truck & Shovel / Loader
  • Sub-level stoping


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.

Marcapunta is an underground operation that exploits arsenical copper ore.

The Marcapunta mining method involves long drills, by sub-levels.


Crushing and Grinding


Processing

  • Flotation

Source: Subscription required

Summary:

The ore from Marcapunta is treated in Plant 1, which uses the selective flotation process to achieve the concentration of the economic Cu mineralization. The concentrating plant is located in the Community of Huaraucaca, and includes the crushing, 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 the copper ore from the Marcapunta Norte Mine. It has direct access to a railway, which is used to transport the concentrates to the port of El Callao.

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 b ........

Recoveries & Grades:

CommodityParameter20192018201720162015
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required49.958.950.9
Gold Head Grade, g/t  ......  Subscription required  ......  Subscription required0.560.530.31
Copper Recovery Rate, %  ......  Subscription required  ......  Subscription required93.690.485.2
Copper Head Grade, %  ......  Subscription required  ......  Subscription required1.912.071.92
Zinc Recovery Rate, %  ......  Subscription required  ......  Subscription required59.361.162
Zinc Head Grade, %  ......  Subscription required  ......  Subscription required2.742.672.77
Lead Recovery Rate, %  ......  Subscription required  ......  Subscription required56.747.658.7
Lead Head Grade, g/t  ......  Subscription required  ......  Subscription required1.130.771.03

Production:

CommodityProductUnits20192018201720162015
Silver Metal in concentrate oz  ......  Subscription required3,901,8694,084,2492,634,7393,669,500
Gold Metal in concentrate oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Copper Metal in concentrate t  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Copper Concentrate kt  ......  Subscription required  ......  Subscription required
Zinc Metal in concentrate t  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Zinc Concentrate kt  ......  Subscription required  ......  Subscription required
Lead Metal in concentrate t  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Lead-Silver Concentrate kt  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Operational Metrics:

Metrics20192018201720162015
Ore tonnes mined  ......  Subscription required  ......  Subscription required5,687,581 t6,111,885 t5,064,478 t
Daily processing capacity  ......  Subscription required  ......  Subscription required20,000 t18,000 t
Tonnes processed  ......  Subscription required  ......  Subscription required5,687,581 t6,111,885 t5,064,478 t
Daily processing rate  ......  Subscription required  ......  Subscription required16,700 t
Subscription required - Subscription is required.

Reserves at December 31, 2019:

CategoryTonnage CommodityGradeContainedĀ Metal
Proven & Probable 76,719 kt Silver 34503 oz/t 805 koz
Proven & Probable 76,719 kt Gold 1.11 oz/t 85,379 koz
Proven & Probable 61,963 kt Copper 1.49 % 920 kt
Proven & Probable 14,756 kt Zinc 2.52 % 371 kt
Proven & Probable 14,756 kt Lead 1.17 % 173 kt
Total Resource 54,519 kt Silver 0.028 oz/t 1,541 koz
Total Resource 145,002 kt Gold 0.62 oz/t 89,950 koz
Total Resource 54,519 kt Copper 1.26 % 685 kt
Total Resource 90,483 kt Zinc 4.98 % 4,507 kt
Total Resource 90,483 kt Lead 1.46 % 1,324 kt

Commodity Production Costs:

CommodityUnits20192018201720162015
Cash costs (sold) Zinc USD  ......  Subscription required 1,569 / t 1,915 / t 1,808 / t 1,601 / t
Cash costs (sold) Copper USD  ......  Subscription required 5,487 / t 5,119 / t 4,651 / t 5,322 / t
Subscription required - Subscription is required.

Financials:

Units20192018201720162015
Capital expenditures M USD  ......  Subscription required29.6  61.1   51.3   37.6  
Revenue M USD  ......  Subscription required333.56  322.65   230.61   171.29  
Gross profit M USD  ......  Subscription required37  68.3   -3.98   -33.26  
Operating Income M USD  ......  Subscription required36.5  25.8   -28.1   -66.52  
Pre-tax Income M USD  ......  Subscription required26.7  14.3   -40.67   -80.3  
After-tax Income M USD  ......  Subscription required7.57  10.4   -32.82   -76.19  
Subscription required - Subscription is required


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 21, 2020
....................... Subscription required ....................... Subscription required Subscription required Apr 21, 2020
....................... Subscription required ....................... Subscription required Subscription required Apr 21, 2020
....................... Subscription required ....................... Subscription required Subscription required Apr 21, 2020
....................... Subscription required ....................... Subscription required Subscription required Apr 21, 2020
....................... Subscription required ....................... Subscription required Subscription required Apr 21, 2020
....................... Subscription required ....................... Subscription required Subscription required Apr 21, 2020
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2018

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Annual Report 2018
Form 20-F 2018
Quarterly Report 2018
Sustainability 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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