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Peru
El Porvenir Mine

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 Location:
3 km NW from La Quinua, Peru

  Regional Office:
Av. Circunvalación del Golf los Incas 170 Santiago de Surco
Lima
Peru
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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
  • Zinc
  • Lead
  • Copper
  • Silver
  • Gold
Mining Method
  • Overhand Cut & Fill
  • Sub-level stoping
  • Avoca
  • Hydraulic backfill
Production Start...
Mine Life2028
El Porvenir is an underground, polymetallic mine located in Peru’s Central Andes mountain region. With a shaft depth of 1,732 m, the El Porvenir shaft is the deepest in South America.


Owners

Source: p. 9, 30, 45, 47
CompanyInterestOwnership
Nexa Resources S.A. 83.48 % Indirect
Nexa Resources El Porvenir S.A.C. (operator) 100 % Direct
The El Porvenir mine is wholly-owned and operated by Nexa Resources El Porvenir S.A.C., a subsidiary of Nexa Resources Peru S.A.A. (Nexa Peru) in which Nexa Peru has directly and indirectly a 100% (99.99%) equity interest.

Nexa Resources S.A. owns a total of 83.48% in the Mine that corresponds to the sum of Nexa’s direct interest in Nexa Perú (0.17%) and Nexa’s indirect interest in Nexa Perú (83.38%) through its controlled company Nexa Resources Cajamarquilla S.A. (99.91%).

Contractors

Subscription required - Subscription is required.


Deposit Type

  • Vein / narrow vein
  • Skarn
  • Stratabound
  • Epithermal


Summary:

El Porvenir is situated in the Pasco region of the Western Cordillera of the Andes, within the Eocene-Miocene Polymetallic and Miocene Au-Ag Epithermal Belts.

Three types of mineral deposits are recognized at El Porvenir:
• Skarn (exoskarn and endoskarn),
• Intermediate sulphidation epithermal veins and breccias, and
• Stratabound.

Within the property area, the stratigraphic units of primary interest are the Pucará and the Goyllarisquizga groups. The Goyllarisquizga Group outcrops in the area of the deposit comprising quartz rich sandstone, corresponding to the Goyllarisquizga Formation. Sandstones may vary from quartz arenite to arkose. The matrix is argillaceous to siliceous. Above the 4000 Level, the lithology and stratification are well defined and easy to recognize. Below the 4000 Level, strong alteration has obliterated the original rock intensity forming siliceous breccias and massive silica where it is still possible to recognize quartz grains and in few places the stratification.

Intrusive rocks within the property are variably porphyritic dacite to quartz diorite with hornblende and biotite phenocrysts. The Milpo-Atacocha fault is a major structural feature in the region, which can be traced for nearly 15 km from Yarusyacán in the north to Carmen Chico in the south.

Mineralization is characterized as a skarn, intermediate sulphidation epithermal vein/brecciastyle, or stratabound mineralization in the Goyll ........


Mining Methods

  • Overhand Cut & Fill
  • Sub-level stoping
  • Avoca
  • Hydraulic backfill


Summary:

El Porvenir is one of the deepest underground mines in South America, extending more than 1,800 m below the main access level. El Porvenir produces approximately 2.1 Mtpa of zinclead-copper ore using two mining methods, with the predominant method being mechanized overhand cut & fill (C&F). C&F has been used at El Porvenir for many decades and accounts for over 80% of its production. The remainder of the output comes from sub-level stoping (SLS), which was introduced at the operation in 2018. El Porvenir uses a version of this method called Avoca, also referred to as longitudinal longhole retreat mining.

Mine production is presently underway in the Upper Zone, the Intermediate Zone, the Lower North Zone, and the Lower West (El Porvenir 9) Zone.

MINE DESIGN AND MINING METHODS
C&F and SLS have similar development requirements as they both involve dividing a mining zone into horizons between sublevels and excavating the ore in an ascending fashion. Sublevels are typically spaced at 20 m vertical intervals and accessed via spiral ramps. The development on each sublevel includes an access drift, a footwall drive, and crosscuts or attack ramps, which provide access to the orebody. For SLS, the footwall drive can be as close as 15 m from the footwall contact, whereas for C&F, they have to be offset from it by 60 m to provide sufficient distance for fanning the attack ramps.

C&F’s mining cycle: drilling, blasting, mucking, and ground support. Bac ........


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Production:

CommodityProductUnits202220212020201920182017
Zinc Metal in concentrate M lbs  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required128102
Lead Metal in concentrate M lbs  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Copper Metal in concentrate M lbs  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Metal in concentrate koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Metal in concentrate koz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Zinc Equivalent Metal in concentrate kt  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Zinc Concentrate kt  ......  Subscription required  ......  Subscription required11592
Lead Concentrate kt  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Copper Concentrate kt  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202120202019201820172016
Daily mining capacity  ......  Subscription required  ......  Subscription required
Tonnes processed  ......  Subscription required  ......  Subscription required2,121 kt2,150 kt1,835 kt
Daily processing capacity  ......  Subscription required  ......  Subscription required6,500 t6,500 t6,500 t5,600 t
Annual processing capacity  ......  Subscription required  ......  Subscription required
Ore tonnes mined  ......  Subscription required  ......  Subscription required2,111 kt2,145 kt
Subscription required - Subscription is required.

Reserves at December 31, 2021:
Mineral Reserves are estimated at NSR cut-off values ranging from US$57.63/t to US$62.19/t depending on the zone and mining method. Mineral Reserves are estimated using average long-term prices of Zn: US$2,722.20/t (US$ 1.23/lb); Pb: US$1,997.21/t (US$0.91/lb); Cu: US$7,288.26/t (US$3.31/lb); and Ag: US$19.68/oz.
Mineral Resources are estimated at NSR cut-off values ranging from of US$57.45/t to US$60.39/t for SLS areas and US$ 59.24/t to US$62.18 for C&F areas depending on the zone. Mineral Resources are estimated using average long-term metal prices of Zn: US$3,130.52/t (US$1.42/lb), Pb: US$2,296.79/t (US$1.04/lb); Cu: US$8,381.50/t (US$3.80/lb) and Ag: US$22.63/oz.

CategoryTonnage CommodityGradeContained Metal
Proven & Probable 15.32 Mt Zinc 3.57 % 547.5 kt
Proven & Probable 15.32 Mt Lead 1.04 % 159.8 kt
Proven & Probable 15.32 Mt Copper 0.2 % 31.3 kt
Proven & Probable 15.32 Mt Silver 69.5 g/t 34,242 koz
Measured & Indicated 3.68 Mt Zinc 2.91 % 107 kt
Measured & Indicated 3.68 Mt Lead 0.78 % 28.5 kt
Measured & Indicated 3.68 Mt Copper 0.2 % 7.4 kt
Measured & Indicated 3.68 Mt Silver 50.4 g/t 5,964 koz
Inferred 10.42 Mt Zinc 3.85 % 401.2 kt
Inferred 10.42 Mt Lead 0.95 % 99 kt
Inferred 10.42 Mt Copper 0.21 % 21.9 kt
Inferred 10.42 Mt Silver 69.2 g/t 23,183 koz

Commodity Production Costs:

CommodityUnits202220212020201920182017
Cash costs (sold) Zinc USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 0.54 / lb†   0.55 / lb†  
^ Guidance / Forecast.
† Net of By-Product.
Subscription required - Subscription is required.

Operating Costs:

Units20212020201920182017
Total operating costs ($/t milled) USD 58.357.158.554.254.7

Financials:

Units20212020201920182017
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 25.6   19.8  
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 25.6   19.8  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 187.2   164.9  
EBITDA M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 57   47.4  
Subscription required - Subscription is required



Heavy Mobile Equipment as of December 31, 2020:
HME TypeModelSizeQuantityLeased or
Contractor
ANFO Loader ....................... Subscription required ....................... Subscription required
ANFO Loader ....................... Subscription required ....................... Subscription required
ANFO Loader ....................... Subscription required ....................... Subscription required Leased
Bolter ....................... Subscription required ....................... Subscription required
Bolter ....................... Subscription required ....................... Subscription required Leased
Bolter ....................... Subscription required ....................... Subscription required Leased
Cable bolter ....................... Subscription required ....................... Subscription required Leased
Drill ....................... Subscription required ....................... Subscription required Leased
Forklift ....................... Subscription required ....................... Subscription required
Jumbo ....................... Subscription required ....................... Subscription required Leased
Jumbo ....................... Subscription required ....................... Subscription required
Jumbo ....................... Subscription required ....................... Subscription required
Jumbo ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required 6 cu. yd ....................... Subscription required Leased
Loader ....................... Subscription required 3.5 cu. yd ....................... Subscription required
Loader ....................... Subscription required 6 cu. yd ....................... Subscription required
Loader ....................... Subscription required 6 cu. yd ....................... Subscription required
Loader ....................... Subscription required 6 cu. yd ....................... Subscription required Leased
Scaler ....................... Subscription required ....................... Subscription required Leased
Scaler ....................... Subscription required ....................... Subscription required
Scaler ....................... Subscription required ....................... Subscription required
Scaler ....................... Subscription required ....................... Subscription required
Scissor Lift ....................... Subscription required ....................... Subscription required
Shotcreter ....................... Subscription required ....................... Subscription required Leased
Shotcreter ....................... Subscription required ....................... Subscription required Leased
Truck (dump) ....................... Subscription required ....................... Subscription required Leased
Truck (dump) ....................... Subscription required ....................... Subscription required Leased
Truck (dump) ....................... Subscription required ....................... Subscription required Leased
Truck (dump) ....................... Subscription required ....................... Subscription required Leased
Truck (dump) ....................... Subscription required ....................... Subscription required Leased
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required May 12, 2022
....................... Subscription required ....................... Subscription required Subscription required May 12, 2022
....................... Subscription required ....................... Subscription required Subscription required May 12, 2022
....................... Subscription required ....................... Subscription required Subscription required May 12, 2022
Subscription required - Subscription is required.

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 Subscription required Subscription required 2017
Subscription required 2016
Subscription required 2015

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Annual Review 2018
Financial Review 2018
Form 20-F 2018
Quarterly Report 2018
Quarterly Report 2018
Annual Report 2017
Technical Report 2017
Annual Report 2016
Annual Report 2016
Annual Report 2015
Annual Report 2015
Other 1955
Subscription required - Subscription is required.

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