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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:
Las Begonias 415, Piso 19, San Isidro
Lima
Peru
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Overview

StageProduction
Mine TypeOpen Pit & Underground
Commodities
  • Gold
  • Silver
  • Zinc
  • Lead
  • Copper
  • Lead-Silver
Mining Method
  • Truck & Shovel / Loader
  • Sub-level stoping
  • Room-and-pillar
  • Cemented backfill
Production Start...
Mine Life2033
El Brocal exploits two adjoining mines: Tajo Norte (Colquijirca), an open-pit operation that produces silver, lead, zinc and copper ores; and Marcapunta, an underground mine that produces copper minerals.

Currently, Colquijirca is one of the largest producers of Zn Pb-Ag and Cu (Au) in Peru.


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

  • Epithermal
  • Vein / narrow vein
  • Porphyry
  • Carbonate hosted


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

  • Truck & Shovel / Loader
  • Sub-level stoping
  • Room-and-pillar
  • Cemented backfill


Summary:

El Brocal mining operations are developed at open pit and underground. In turn, these are distributed in the following sectors:

i. Open pit operations:
1.Tajo Norte
2.Tajo Sur

ii. 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.

The following design parameters have been considered for the open pit operation:
- Bench height: 6 m.
- Berm width: variable between 5 and 8 m.
- Ramp width: considering equipment width, safety distances, and safety berm, the open pit have ramp widths of 12 m with a 10% slope.
- Optimum turning radius according to the equipment fleet is 6.4 m.
- Minimum loading width considering the excavator and the minimum spaces to carry out operational activities is 20 m. However, one excavator is ........


Crushing and Grinding
Flow Sheet: Source

Plant 1 – Crushing Stage
Dump trucks deliver fresh ore to a coarse ore bin, which has a capacity of 100 tonnes and is equipped with a rock breaker as well as a stationary 20” opening grizzly. The grizzly’s passing size directly feeds a 47” x 33” jaw crusher operating with a 4” close side setting. The crusher discharge is conveyed to a primary 8’ x 20’ double-deck classification vibrating screen whose passing ½” stream becomes the final product from the crushing plant that is conveyed to a stockpile. The coarse stream from the primary screen feeds a secondary closed-circuit crushing-classification stage consisting of a secondary cone crusher operating with a close-side setting of 47 mm and a secondary doubledeck vibrating screen with a ½” passing size. A fraction of the secondary vibrating screen’s coarse stream feeds a tertiary cone crusher operating in open circuit with a close-side setting of 13mm. Alternatively, the secondary screen’s coarse fraction feeds a second tertiary cone crusher with a close-side setting of 10mm operating in open circuit. Product from both tertiary cone crushers becomes final product from the crushing plant that is conveyed to the stockpile.

The crushing plant’s final product sizing approximately P80= ½” is stored on two covered stockpiles of 6,000 tonnes and 2,000 tonnes each.

Plant 1 – Grinding & Classification
The grinding and classification stage consists of primary grinding in an open circuit followed by a classification stage, where hydrocyclones feed the coarse fraction to a secondary grinding stage that operates in a close-circuit with a multi-deck vibrating screen. A fine ore reclaim system feeds the primary grinding stage, which consists of a 7” x 12” and 550 HP single rod mill operating in open circuit. The rod mill product feeds a hydrocyclone classification stage. The hydrocyclone’s coarse fraction feeds the secondary ball mill consisting of a 16.5” x 23’ and 400 HP ball mill. Ball mill discharge along with hydrocyclones fines stream feeds six multi-deck (5 decks) vibrating screens. The screen’s passing (fine fraction) fraction becomes final grinding product and feeds the flotation stage. The screen’s coarse fraction is returned to the ball mill.

Plant 2 – Crushing, Washing & Classification Stage
Dump trucks deliver material to a coarse ore bin of 300 tonnes capacity equipped with a rock breaker and a stationary grizzly. The grizzly’s passing size directly feeds a roller crusher with 536 hp. The crusher discharge is conveyed to a washing stage consisting of a rotary washing trommel of 3.6 m diameter and 12 m long that discharges onto two doubledeck 10’ x 24’ banana screens operating in series (primary and secondary). Oversize from the primary banana screen feeds a secondary crushing stage operating in open circuit and consisting of a 500 tonnes capacity hopper feeding two parallel gyratory crushers. Discharge from the secondary crushers joins the oversize from the secondary banana screen to feed a tertiary crushing stage consisting of a 400 tonnes hopper feeding a high pressure grinding rolls unit (HPGR). Discharge from the HPGR feeds a single 15’ x 26’ banana screen whose passing stream become final product from the crushing plant that is conveyed to a fines stockpile (overall coarse fraction). The coarse stream from the tertiary banana screen is recirculated back to the tertiary crushing stage.

Passing stream from the secondary banana screen feeds a Four-stage classification plant. The first stage consist of a single primary hydrocyclone whose underflow feeds the secondary classification stage using a multi-deck high frequency vibrating screen. The fines fraction from the primary and secondary stage feed the tertiary stage consisting of 22 hydrocylones. Overflow stream (fines) from the tertiary stage feed the quaternary stage consisting of 16 hydrocyclones. The coarse stream from the secondary stage feeds the fines stockpile. The underflow stream from the tertiary stage feeds primary grinding stage. The underflow from the quaternary stage feeds the fines flotation plant. The overflow stream from the quaternary stage feed a 20 m diameter clarifier whose discharge is split between the fines flotation plants and the ultrafines flotation plant.

Plant 2 – Grinding
The coarse fraction from the washing, crushing and classification stage are stored in a 50,000 tonnes capacity stock pile. Ore is reclaimed from the stockpile using a front-end loader to feed a hopper that subsequenlty feeds the primary grinding stage. The primary grinding stage consists of two ball mills operating in parallel; the first unit is a 9.5’ x 14’ and 600 kW and the second unit is a 20’ x 30’ and 6500 kW. Both ball mills operate in close-circuit with 10 units of a high frequency multi-deck vibrating screen. The passing stream from the classification screens feeds the conditioning tank to the flotation stage.


Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.

^ Guidance / Forecast.

Production:

CommodityProductUnits2022202120202019201820172016
Gold Metal in concentrate oz  ......  Subscription required ^  ......  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  ......  Subscription required
Zinc Metal in concentrate t  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Lead Metal in concentrate t  ......  Subscription required ^  ......  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  ......  Subscription required
Zinc Concentrate kt  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Copper Concentrate kt  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Lead-Silver Concentrate kt  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
^ Guidance / Forecast.
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Operational Metrics:

Metrics202220212020201920182017
Daily ore mining rate  ......  Subscription required
Tonnes processed  ......  Subscription required  ......  Subscription required  ......  Subscription required6,334,038 t6,633,879 t5,687,581 t
Daily processing capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required20,000 t20,000 t20,000 t
Daily processing rate  ......  Subscription required  ......  Subscription required  ......  Subscription required
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required6,334,038 t6,633,879 t5,687,581 t
^ Guidance / Forecast.
Subscription required - Subscription is required.

Reserves at December 31, 2021:

CategoryTonnage CommodityGradeContained Metal
Proven & Probable 58,877 kt Gold 0.017 oz/t 989 koz
Proven & Probable 67,336 kt Silver 1 oz/t 67,350 koz
Proven & Probable 8,459 kt Zinc 2.19 % 185 kt
Proven & Probable 8,459 kt Lead 1.08 % 92 kt
Proven & Probable 58,877 kt Copper 1.49 % 877 kt
Measured & Indicated 30,798 kt Gold 0.03 oz/t 838 koz
Measured & Indicated 113,113 kt Silver 0.46 oz/t 51,905 koz
Measured & Indicated 82,315 kt Zinc 5.17 % 4,256 kt
Measured & Indicated 82,315 kt Lead 1.51 % 1,246 kt
Measured & Indicated 30,798 kt Copper 1.63 % 502 kt

Commodity Production Costs:

CommodityUnits202120202019201820172016
Cash costs (sold) Lead USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Cash costs (sold) Zinc USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 1,569 / t   1,915 / t   1,808 / t  
Cash costs (sold) Copper USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 5,487 / t   5,119 / t   4,651 / t  
Cash costs (sold) Silver USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Cash costs (sold) Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
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Financials:

Units2022202120202019201820172016
Capital expenditures (planned) M USD  ......  Subscription required
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 29.6   61.1   51.3  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 333.6   322.7   230.6  
Operating Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 36.5   25.8   -28.1  
Gross profit M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 37   68.3   -4  
Pre-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 26.7   14.3   -40.7  
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 7.6   10.4   -32.8  
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Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jul 22, 2022
....................... Subscription required ....................... Subscription required Subscription required Jul 22, 2022
....................... Subscription required ....................... Subscription required Subscription required Jul 22, 2022
....................... Subscription required ....................... Subscription required Subscription required Jul 22, 2022
....................... Subscription required ....................... Subscription required Subscription required Jul 22, 2022
....................... Subscription required ....................... Subscription required Subscription required Jul 22, 2022
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Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2021
Subscription required Subscription required Subscription required 2020
Subscription required Subscription required Subscription required 2019
Subscription required Subscription required Subscription required 2018
Subscription required 2017

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... 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
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