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Peru
Atacocha Mine

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 Location:
72 km S from Huanuco, 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 TypeOpen Pit
Commodities
  • Zinc
  • Silver
  • Lead
  • Gold
Mining Method
  • Truck & Shovel / Loader
  • Overhand Cut & Fill
  • Sub-level stoping
  • Dry waste backfill
  • Hydraulic backfill
Production Start...
Mine Life6 years (as of Jan 1, 2022)
The Atacocha site includes two mines: the Atacocha underground mine and the San Gerardo open pit mine. The underground mine is suspended, but mining continues in the San Gerardo open pit mine.

In 2022, Nexa Resources has continued to make progress with project to evaluate the optimization of the integration of El Porvenir and Atacocha mines at Cerro Pasco complex.


Owners

Source: p. 9,31,50,85
CompanyInterestOwnership
Nexa Resources S.A. 75.96 % Indirect
Nexa Resources Atacocha S.A.A. (operator) 100 % Direct
The mine is wholly-owned and operated by Nexa Resources Atacocha S.A.A., which is controlled 91% by Nexa Resources El Pornevir S.A.C., a 99.99% subsidiary of Nexa Resources Peru S.A.A.

Nexa Resources S.A. owns 83.55% interest in Nexa Peru and therefore holds 75.96% of Atacocha mine.

Contractors

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Deposit Type

  • Breccia pipe / Stockwork
  • Vein / narrow vein
  • Skarn
  • Replacement


Summary:

The Atacocha property is situated in the Pasco region of the Western Cordillera of the Andes mountain range in central Peru, within the Eocene-Miocene Polymetallic, and Miocene Au-Ag Epithermal Belts.

Within the property area the stratigraphic units of primary interest are the Chambara´ Aramachay and Condorsinga formations, as well as other undifferentiated limestone units of the Pucara´ Group, the Goyllarisquizga formation, and stratigraphically overlying basalt layers. Intrusive rocks within the property are variably porphyritic dacite to quartz diorite with hornblende and biotite phenocrysts. Dacitic dikes are sub-divided into 2 units: porphyritic with feldspar phenocrysts and little quartz restricted to the groundmass; and porphyritic with abundant quartz phenocrysts, with minor biotite and hornblende. These dacitic dikes generally trend north-south, and are observed in 3 areas: Santa Ba´rbara/central, south along/parallel to the Atacocha Fault, and south of Section 3. The intrusive suite is part of the Milpo-Atacocha-Vinchos, age dated to 29-26 Ma. The Santa Ba´rbara and San Gerardo stocks are two principal intrusive units within the property.

At Atacocha, mineralization is characterized as either a skarn-, replacement- or hydrothermal vein/brecciastyle mineralization. Skarn-related mineralization generally spatially associated with either the Santa Barbara stock or San Gerardo stock is paragenetically earlier, followed by the hydrothermal minerali ........


Mining Methods

  • Truck & Shovel / Loader
  • Overhand Cut & Fill
  • Sub-level stoping
  • Dry waste backfill
  • Hydraulic backfill


Summary:

Atacocha operates two mines: the Atacocha underground mine and the San Gerardo open pit mine. The underground mine is currently suspended, but mining continues in the San Gerardo open pit mine.

San Gerardo is an open pit operation located at the top of mineralized zone, and is mined by 6 m high benches. Since the temporally suspension of Atacocha underground mine, the open pit production is responsible by the metallurgical plant feed. Operations are carried out by contractor with a mining fleet that allows selectivity in the loading process.

The Atacocha underground mine is mined by the overhand Cut & Fill (C&F) and sublevel stoping (SLS) mining methods. C&F stopes are 20 m high consisting of 4 m high cuts and a minimum mining width of 4 m. C&F stopes are located 55 m from the main ramps and accessed by stope access ramps with grades varying from -15% to +15%. Production is achieved by horizontal drill and blast, and backfilled using unconsolidated waste fill or hydraulic backfill. The SLS mining method has demonstrated increased productivities and reduced unit costs as compared to the C&F mining method. SLS stopes are located a minimum of 40m from infrastructure, are 20 m high, 30 m long and have a minimum mining width of 4 m. Production is achieved by vertical blastholes, and backfilled using unconsolidated waste fill.


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

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Production:

CommodityUnits2023202220212020201920182017
Zinc t  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required17,32316,950
Silver koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Lead t  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Zinc Equivalent M lbs  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in concentrate. ^ Guidance / Forecast.
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Operational Metrics:

Metrics202220212020201920182017
Ore tonnes mined  ......  Subscription required  ......  Subscription required
Tonnes processed  ......  Subscription required  ......  Subscription required  ......  Subscription required1,505 kt1,551 kt1,507 kt
Daily processing capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required4,500 t4,500 t4,500 t
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Reserves at December 31, 2022:
Underground:
Mineral Resources are estimated at a NSR cut-off value of US$ 62.81/t for resources shapes.
The NSR cut-offs are calculated based on the LOM costs using average long-term metal prices of Zn: US$ 3,250.3/t (US$ 1.47/lb), Pb: US$ 2,350.5/t (US$ 1.07/lb), Ag: US$ 22.92/oz.

Open Pit:
Mineral Resources are estimated at a NSR cut-off value of US$23.81/t. Some marginal material with cut-off value of US$21.69t was included.
The NSR cut-offs are calculated based on an average long-term metal price of Zn: US$ 3,250.3/t (US$1.47/lb), Pb US$ 2,350.5/t (US$1.07/lb), Au US$ 1,696.11/oz and Ag US$ 22.92/oz.

CategoryOreTypeTonnage CommodityGradeContained Metal
Measured & Indicated In-Situ (OP) 10.06 Mt Zinc 1.07 % 108.1 kt
Measured & Indicated In-Situ (UG) 7.07 Mt Zinc 4.16 % 294.2 kt
Measured & Indicated In-Situ (OP) 10.06 Mt Silver 32.2 g/t 10,400 koz
Measured & Indicated In-Situ (UG) 7.07 Mt Silver 77.2 g/t 17,539 koz
Measured & Indicated In-Situ (OP) 10.06 Mt Lead 0.97 % 97.1 kt
Measured & Indicated In-Situ (UG) 7.07 Mt Lead 1.47 % 103.6 kt
Measured & Indicated In-Situ (OP) 10.06 Mt Gold 0.21 g/t 67.6 koz
Inferred In-Situ (OP) 3.84 Mt Zinc 1.13 % 43.4 kt
Inferred In-Situ (UG) 8.11 Mt Zinc 4.45 % 360.9 kt
Inferred In-Situ (OP) 3.84 Mt Silver 31.7 g/t 3,914 koz
Inferred In-Situ (UG) 8.11 Mt Silver 82 g/t 21,389 koz
Inferred In-Situ (OP) 3.84 Mt Lead 1.01 % 38.8 kt
Inferred In-Situ (UG) 8.11 Mt Lead 1.26 % 102.2 kt
Inferred In-Situ (OP) 3.84 Mt Gold 0.2 g/t 24.7 koz

Commodity Production Costs:

CommodityUnits2023202220212020201920182017
Cash costs (sold) Zinc USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 0.51 / lb†   -0.09 / lb†  
^ Guidance / Forecast.
† Net of By-Product.
Subscription required - Subscription is required.

Operating Costs:

Units202220212020201920182017
Total operating costs ($/t milled) USD 36.732.433.250.84442.8

Financials:

Units2023202220212020201920182017
Capital expenditures (planned) M USD  ......  Subscription required
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 16.9   5.9  
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 16.9   5.9  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 90.1   112  
Operating Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 0.3   16  
Gross profit M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 9.3   28.3  
Pre-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required -2.1   10.7  
EBITDA M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 12.8   29.3  
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Water Supply
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Heavy Mobile Equipment as of March 22, 2019:
HME TypeModelSizeQuantityLeased or
Contractor
Dozer ....................... Subscription required ....................... Subscription required Leased
Dozer ....................... Subscription required ....................... Subscription required Leased
Drill ....................... Subscription required ....................... Subscription required Leased
Drill ....................... Subscription required ....................... Subscription required Leased
Excavator ....................... Subscription required ....................... Subscription required Leased
Excavator ....................... Subscription required ....................... Subscription required Leased
Grader ....................... Subscription required ....................... Subscription required Leased
Loader (FEL) ....................... Subscription required ....................... Subscription required Leased
Truck (haul) ....................... Subscription required 15 cu. m ....................... Subscription required Leased
Truck (haul) ....................... Subscription required 20 cu. m ....................... Subscription required Leased
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required May 23, 2023
....................... Subscription required ....................... Subscription required Subscription required May 23, 2023
....................... Subscription required ....................... Subscription required Subscription required May 23, 2023
....................... Subscription required ....................... Subscription required Subscription required May 23, 2023
....................... Subscription required ....................... Subscription required Subscription required May 23, 2023
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2022
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
Corporate Presentation 2023
Annual Report 2022
Annual Review 2022
Form 20-F 2022
Press Release 2022
................................... Subscription required 2021
................................... 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 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Annual Report 2018
Annual Report 2018
Financial Review 2018
Form 20-F 2018
Quarterly Report 2018
Annual Report 2017
Annual Report 2017
Technical Report 2017
Annual Report 2016
Annual Report 2016
Annual Report 2015
Financial Review 2015
Other 1955
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