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Peru
Marcapunta Mine (Colquijirca (El Brocal) Operation)

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 Location:
159 km NE from Lima, Peru

  Regional Office:
Las Begonias 415, 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 TypeUnderground
Commodities
  • Silver
  • Gold
  • Copper
Mining Method
  • Sub-level stoping
  • Backfill
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
  • Epithermal
  • Carbonate hosted


Summary:

The Colquijirca mine consists of three important polymetallic deposits: (1) Tajo Norte–Smelter, which contains zinc, silver and lead ore; (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, which contains zinc.

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

  • Sub-level stoping
  • Backfill


Summary:

The mining method in the Marcapunta mine (Underground) is sub level stoping with long pillars and backfill. This method is used to mine the Copper mantle that has an ore thickness up to 60 m. Mining is made by contactor with its own equipment. The equipment used for development are 2 arm jumbos with 6 yd3 underground loaders. The equipment used for production includes S7 top hammer Simbas with 6 yd3 underground loaders with remote control. Ore haulage to surface is done with 12 m3 15 m3 tipper trucks. Ore is taken to the process plant with 15 m3 and 20 m3 tipper trucks. In 2021, we are planning to use 9 yd3 underground loaders and in the hole hammer. Bench height is also being optimized in new zones from 20 m to 30 m.


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.

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
Silver Recovery Rate, %  ......  Subscription required  ......  Subscription required6163.162.258.4
Silver Head Grade, oz/t  ......  Subscription required  ......  Subscription required0.710.660.590.75
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required39.849.958.950.9
Gold Head Grade, g/t  ......  Subscription required  ......  Subscription required0.510.560.530.31
Copper Recovery Rate, %  ......  Subscription required  ......  Subscription required90.693.690.485.2
Copper Head Grade, %  ......  Subscription required  ......  Subscription required1.591.912.071.92

Production:

CommodityUnits202020192018201720162015
Silver oz  ......  Subscription required  ......  Subscription required1,383,5361,052,453799,497858,109
Gold oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Copper t  ......  Subscription required  ......  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:

Metrics202020192018201720162015
Ore tonnes mined  ......  Subscription required2,926,124 t3,204,262 t2,517,673 t2,597,926 t1,962,627 t
Subscription required - Subscription is required.

Reserves at December 31, 2020:

CategoryTonnage CommodityGradeContainedĀ Metal
Proven & Probable 34,503 kt Silver 1.15 oz/t 39,799 koz
Proven & Probable 34,503 kt Gold 0.023 oz/t 805 koz
Proven & Probable 34,503 kt Copper 1.3 % 450 kt
Measured & Indicated 21,582 kt Silver 0.932 oz/t 20,105 koz
Measured & Indicated 21,582 kt Gold 0.026 oz/t 551 koz
Measured & Indicated 21,582 kt Copper 1.398 % 302 kt

Commodity Production Costs:

CommodityUnits202020192018201720162015
Cash costs (sold) Copper USD  ......  Subscription required  ......  Subscription required 5,487 / t 5,119 / t 4,651 / t 5,322 / t
Subscription required - Subscription is required.


Heavy Mobile Equipment as of December 31, 2020:
HME TypeModelSizeLeased or
Contractor
Drill (long hole) ....................... Subscription required Leased
Drill jumbo (two boom) Leased
Loader 6 cu. yd Leased
Truck (dump) 12 cu. m Leased
Truck (dump) 15 cu. m Leased
Truck (dump) 20 cu. m Leased
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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 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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