Peru

El Porvenir Mine

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Overview

Mine TypeUnderground
Commodities
  • Zinc
  • Copper
  • Silver
  • Lead
  • Gold
Mining Method
  • Overhand Cut & Fill
  • Sub-level stoping
  • Avoca
  • Unconsolidated hydraulic fill
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Mine Life2033
ShapshotThe El Porvenir, Atacocha Underground and Atacocha Open Pit mines are part of the Cerro Pasco Complex.

The Cerro Pasco Complex Integration Project involves the continued integration of the El Porvenir and Atacocha underground mines, with ore from both mines being processed at the El Porvenir processing plant.

The Integration Project plan includes:
- the restart and rehabilitation of the Atacocha underground mine;
- the development of an approximately 2 km long connection tunnel (Tunnel 2900), which will connect the Atacocha underground mine to the bottom of the El Porvenir (Picasso) shaft, allowing the production from both underground mines to be hoisted and fed at the El Porvenir processing plant;
- the expansion of the Picasso shaft capacity;
- the closure of the Atacocha processing plant in 2027.

Owners

SourceSource
CompanyInterestOwnership
Nexa Resources S.A. 83.48 % Indirect
Nexa Resources El Porvenir S.A.C. (operator) 100 % Direct
The El Porvenir mine is operated by Nexa Resources El Porvenir S.A.C., a subsidiary of Nexa Peru in which Nexa Peru has directly and indirectly a 100% equity interest.

Nexa Peru is 83.48% directly and indirectly owned by Nexa Resources.

Contractors

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Deposit type

  • Breccia pipe / Stockwork
  • Vein / narrow vein
  • Skarn
  • Stratabound
  • Epithermal

Summary:

At El Porvenir, mineralization is characterized as a skarn, intermediate sulphidation epithermal vein/breccia style, or stratabound mineralization in the Goyllarisquizga Formation.

Skarn related mineralization associated with the Milpo stock is paragenetically earlier, followed by hydrothermal mineralization. Skarn-related mineralization is commonly associated with the garnet and silica-skarn-chlorite assemblages, comprising pyrite, chalcopyrite, sphalerite, galena and minor pyrrhotite, pyrite, bornite, covellite, orpiment, and realgar within the Pucará Group sediments around the Milpo stock. Molybdenite may occur proximal to the skarn related mineralization. Elevated Bi and Au contents are reported to be associated with skarn related mineralization. Veins and veinlets with pyrite, chalcopyrite, sphalerite, galena, quartz, and carbonates occur within marble units, and are spatially associated with skarn bodies.

The silica breccia consists of sub-rounded to sub-angular white to milky grey opaline silica clasts, millimetres to centimetres in size, and to a lesser extent, sandstone, and limestone clasts. The silica breccia clasts are cemented by white granular silica, with occasional cross cutting veins of white silica.

The massive (siliceous) breccia forms zones of pervasive alteration comprising predominantly fine grained and massive white silica.

The granular (siliceous) breccia comprises loose white to grey grains of silica within a poorly cemented (undifferentiated) clay matrix.

The Ag-Pb-Zn breccias are sub-divided into calcareous, polymictic-monomictic, and karst (collapse). Breccia clasts include limestone, marble, silica (massive), and skarn; the composition of the clasts indicates that brecciation occurred later than skarn development. Massive silica alteration may cross-cut skarns.

The calcareous breccia comprises sub-angular to sub-rounded clasts of limestone and marble, cemented by a grey to dark grey calcareous matrix, with occasional bituminous material and rare pyrite. Pyrite, sphalerite, galena, and other sulphides including orpiment, realgar, tetrahedrite, alabandite, stannite, as well as quartz, calcite, rhodochrosite and rhodonite occur within the matrix. The geochemical-mineralogical zoning is evident whereby galena (Pb) and Mn bearing minerals are more abundant distally relative to sphalerite (Zn). Bi and Sn bearing minerals are most elevated in the magmatic-hydrothermal system.

The polymictic to monomictic breccias are overall grey and comprise sub-angular clasts of black limestone, shale, white silica with veins of silica-pyrite, and marble with silica, wollastonite, and calcite. Monomictic breccias comprise sub-angular limestone or intrusive clasts. Polymictic and monomictic breccia clasts vary in size and are cemented with an amorphous black material with disseminated pyrite. Pyrite, chalcopyrite, sphalerite, galena, and possibly other sulphides occur within the matrix, forming veins/veinlets, pockets, or disseminations. Karst breccias contain clasts of limestone, marble, silica, skarn, and intrusive rocks. They are sub-angular to sub rounded, occurring within a matrix of sub-horizontal laminated limestone and silica-sericite-clay material.

The stratabound Pb-Ag-Zn mineralization occurs in the sandstone strata (mantos) at the base of the Goyllarizquisga Formation (near the contact with the Pucará Group). Several disseminated sulphide mantos have recently been identified at Sara and Porvenir 2W within the quartz sandstone, generally in contact with layers of silt and microconglomerates. The minerals include galena with Ag content, sphalerite, and pyrite. Au is also present.

Reserves

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Mining Methods

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Comminution

Crushers and Mills

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Processing

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Production

CommodityProductUnits2024202320222021202020192018
Zinc Metal in concentrate M lbs 00000000000000000000128
Copper Metal in concentrate M lbs 00000000000001.3
Silver Metal in concentrate koz 00000000000000000000000000002,534
Lead Metal in concentrate M lbs 0000000000000000037
Gold Metal in concentrate koz 00000000009.7
Zinc Equivalent Metal in concentrate kt 00000000000090
Zinc Concentrate kt 00000115
Copper Concentrate kt 00002.7
Lead Concentrate kt 000032
^ Guidance / Forecast.

Operational metrics

Metrics202320222021202020192018
Daily mining capacity 0000000000000000
Daily processing capacity 000000000000000000006,500 t
Annual processing capacity 0000000000
Ore tonnes mined 0000000000000000002,145 kt
Tonnes processed 000000000000000000000000000002,150 kt

Production Costs

CommodityUnits2024202320222021202020192018
Cash costs (sold) Zinc USD 0000000 0000000 0000000 000000 0000000 0.62 / lb   0.54 / lb  
^ Guidance / Forecast.
Net of By-Product.

Operating Costs

Currency2023202220212020201920182017
Total operating costs ($/t milled) USD 62.8  59.8  58.3  57.1  58.5  54.2  54.7  

Financials

Units2023202220212020201920182017
Capital expenditures M USD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 25.6   19.8  
Sustaining costs M USD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 25.6   19.8  
Revenue M USD  ....  Subscribe  ....  Subscribe  ....  Subscribe 187.2   164.9  
EBITDA M USD  ....  Subscribe  ....  Subscribe  ....  Subscribe 57   47.4  

Heavy Mobile Equipment

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Personnel

Mine Management

Source Source
Job TitleNameProfileRef. Date
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EmployeesContractorsTotal WorkforceYear
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Aerial view:

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