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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, Piso 19, San Isidro
Lima
Peru
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  • Overview
  • Owners
  • Geology
  • Mining
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  • Costs & Financials
  • Fleet
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  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
  • Silver
  • Copper
Mining Method
  • Sub-level stoping
  • Room-and-pillar
  • Cemented backfill
Mine Life2033


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
  • Epithermal
  • Carbonate hosted
  • 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

  • Sub-level stoping
  • Room-and-pillar
  • Cemented backfill


Summary:

Marcapunta, an underground mine that produces copper minerals.

The underground mining methods are Sub level Stopping with cemented back fill and Room and Pillar with long holes. The pillars left in the ground are chain pillars that run along the entire mining direction and cover the mantle’s extension. This method varies depending on the mining sector. Recovery of ore pillars using cemented or detrital backfill is planned.

El Brocal underground mine is located in the southern projection of the open pit.

Underground operations
1.Marcapunta Norte
2.Marcapunta Centro
3.Marcapunta Sureste
4.Marcapunta Suroeste
5.Marcapunta Sur

The underground mining methods are Sub Level Stopping with cemented backfill and Room and Pillar with long holes. The pillars left in the ground are chain pillars that run along the entire mining direction and cover the mantle’s extension.

This method varies depending on the mining sector:
- North Sector: the stope is 8 m wide, 28 m high, and length varies between 50 to 100 m; the pillar width has been set at 6 m.
- South Sector, which includes the Southwest and Southeast Zone: the stope is 14 m wide, 28 m high, and the length varies between 50 and 100 m, with a pillar width of 6 m.

Currently, El Brocal mine uses the long-hole Sub Level Stopping mining method and detrital fill in the most unfavorable sectors. Additionally, the height of overburden varies fro ........


Crushing and Grinding
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Processing

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Summary:

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Production:

CommodityProductUnits202120202019201820172016
Gold Metal in concentrate oz  ......  Subscription required  ......  Subscription required  ......  Subscription required21,42922,53623,511
Silver Metal in concentrate oz  ......  Subscription required  ......  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  ......  Subscription required
Copper 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 required2,926,124 t
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required2,926,124 t3,204,262 t2,517,673 t
^ Guidance / Forecast.
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Reserves at December 31, 2021:

CategoryTonnage CommodityGradeContained Metal
Proven & Probable 32,485 kt Gold 0.025 oz/t 804 koz
Proven & Probable 32,485 kt Silver 0.72 oz/t 23,262 koz
Proven & Probable 32,485 kt Copper 1.32 % 428 kt
Measured & Indicated 29,597 kt Gold 0.028 oz/t 834 koz
Measured & Indicated 29,597 kt Silver 0.81 oz/t 24,094 koz
Measured & Indicated 29,597 kt Copper 1.62 % 481 kt
Inferred 19,679,221 t Gold 0.8 g/t 505,023 oz
Inferred 19,679,221 t Silver 22.56 g/t 14,270,686 oz
Inferred 19,679,221 t Copper 1.76 % 345,869 t

Commodity Production Costs:

CommodityUnits202120202019201820172016
Cash costs (sold) Copper USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 5,487 / t   5,119 / t   4,651 / t  
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Heavy Mobile Equipment as of March 15, 2022:
HME TypeModelSizeQuantityLeased or
Contractor
Bolter ....................... Subscription required ....................... Subscription required Leased
Bolter ....................... Subscription required ....................... Subscription required Leased
Bolter ....................... Subscription required ....................... Subscription required Leased
Drill (long hole) ....................... Subscription required 64 mm ....................... Subscription required Leased
Drill (long hole) ....................... Subscription required 89 mm ....................... Subscription required Leased
Drill (long hole) ....................... Subscription required 89 mm ....................... Subscription required Leased
Jumbo ....................... Subscription required 16 ft ....................... Subscription required Leased
Scaler ....................... Subscription required ....................... Subscription required Leased
Scoop Tram ....................... Subscription required 6 cu. yd ....................... Subscription required Leased
Scoop Tram ....................... Subscription required 6 cu. yd ....................... Subscription required Leased
Scoop Tram ....................... Subscription required 6 cu. yd ....................... Subscription required Leased
Shotcreter ....................... Subscription required ....................... Subscription required Leased
Shotcreter ....................... Subscription required ....................... Subscription required Leased
Telescopic Handler ....................... Subscription required ....................... Subscription required Leased
Telescopic Handler ....................... Subscription required ....................... Subscription required Leased
Truck ....................... Subscription required 15 cu. m ....................... Subscription required Leased
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Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jul 26, 2022
....................... Subscription required ....................... Subscription required Subscription required Jul 22, 2022
....................... Subscription required ....................... Subscription required Subscription required Jul 26, 2022
....................... Subscription required ....................... Subscription required Subscription required Jul 22, 2022
....................... Subscription required ....................... Subscription required Subscription required Jul 26, 2022
Subscription required - Subscription is required.


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
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