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Peru
Atacocha Mine

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 Location:
72 km S from Huanuco, Peru

  Regional Office:
Av. San Borja Norte 523, San Borja
Lima
Peru
Phone  ...  Subscription required
Fax51 710 5544
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit / Underground
Commodities
  • Zinc
  • Lead
  • Copper
  • Silver
  • Gold
Mining Method
  • Truck & Shovel / Loader
  • Mechanized Cut & Fill
  • Sub-level stoping
Processing
  • Flotation
Mine Life11 years (as of Jan 1, 2018)
In light of the current macroeconomic environment and the uncertain time for recovery, the higher-cost Atacocha underground mine remains suspended, following the Company efforts to reduce costs and improve its operational efficiency. [PR June 8, 2020]

The Atacocha site includes two mines: the Atacocha underground mine and the San Gerardo open pit mine.


Owners

Source: p. 39,48
CompanyInterestOwnership
Nexa Resources S.A. 72.94 % Indirect
The Atacocha mine is owned by Nexa Resources Atacocha S.A.A.(formerly Compañía Minera Atacocha), which is controlled by Nexa Peru.

Deposit Type

  • Porphyry
  • Vein / narrow vein


Summary:

The ore bodies can be classified as replacement bodies and veins. Both types are found at Machcan and Atacocha, but replacement has not been an important process at Milpo.

Large irregular replacement bodies in Pucara limestone have provided most of the ore at the Atacocha mine. The ore bodies were formed by incomplete replacement of limestone by sulfides and clay minerals.

Veins at Atacocha are found in all rock types but those in limestone and quartz sandstone are most important; only one vein in porphyry is being mined. Most veins strike from N. 50° W. to west and dip steeply. Veins in limestone are concentrated near the axis of a small cross fold near the Atacocha fault and have been found only in the upper mine workings. They may have filled tension fractures opened during the formation of the cross fold. Veins in quartz sandstone and chert breccia are found on all levels and are the principal source of ore in the deeper workings. Vein width is usually less than 1 meter but occasionally it increases to 3 or 4 meters The most persistent vein has been mined for a strike length of 150 meters and over a vertical extent of 300 meters.

The geologic features on a district-wide scale that may have been important in the localization of the Atacocha ore deposits are: the porphyry intrusives; the Atacocha fault; the contact of the Mitu and Pucara formations; and the series of northwesterly-striking faults.


Mining Methods

  • Truck & Shovel / Loader
  • Mechanized Cut & Fill
  • Sub-level stoping


Summary:

The operation is currently mining ore from both the Atacocha underground mine and the San Gerardo open pit mine.

Mining methods applied at Atacocha underground mine include C&F and sublevel stoping (SLS).


Crushing and Grinding


Processing

  • Flotation

Source: Subscription required

Summary:

The Atacocha Mining Unit is a polymetallic underground mine. It produces zinc, lead and copper concentrates, with contents of gold and silver, through a mineral flotation process in the concentrator plant, which has an installed capacity of 4,500 tpd.

Recoveries & Grades:

CommodityParameter201920182017
Zinc Head Grade, % 1.431.431.43
Lead Head Grade, % 1.31.181.22
Copper Head Grade, % 0.080.10.09
Silver Head Grade, oz/t 1.521.421.43
Gold Head Grade, oz/t 0.0120.0150.019
Zinc Equivalent Head Grade, % 1.431.431.43

Production:

CommodityUnits201920182017
Zinc M lbs  ......  Subscription required  ......  Subscription required37
Lead M lbs  ......  Subscription required  ......  Subscription required  ......  Subscription required
Copper M lbs  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver koz  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold koz  ......  Subscription required  ......  Subscription required  ......  Subscription required
Zinc Equivalent kt  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in concentrate.
Subscription required - Subscription is required.

Operational Metrics:

Metrics20192018201720162015
Daily milling capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required4,400 t4,400 t
Tonnes processed  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Reserves at December 31, 2019:

CategoryOreTypeTonnage CommodityGradeContained Metal
Proven & Probable In-Situ (OP) 5.33 Mt Zinc 1.1 % 58.6 kt
Proven & Probable In-Situ (UG) 3.91 Mt Zinc 3.77 % 147.4 kt
Proven & Probable In-Situ (OP) 5.33 Mt Lead 0.86 % 46 kt
Proven & Probable In-Situ (UG) 3.91 Mt Lead 1.73 % 67.6 kt
Proven & Probable In-Situ (OP) 5.33 Mt Copper 0.03 % 1.4 kt
Proven & Probable In-Situ (UG) 3.91 Mt Copper 0.23 % 8.9 kt
Proven & Probable In-Situ (OP) 5.33 Mt Silver 29.8 g/t 5,110 koz
Proven & Probable In-Situ (UG) 3.91 Mt Silver 78.8 g/t 9,903 koz
Proven & Probable In-Situ (OP) 5.33 Mt Gold 0.25 g/t 42.2 koz
Measured & Indicated In-Situ (OP) 6.24 Mt Zinc 1.17 % 73.3 kt
Measured & Indicated In-Situ (UG) 3.95 Mt Zinc 4.46 % 176.1 kt
Measured & Indicated In-Situ (OP) 6.24 Mt Lead 0.91 % 56.7 kt
Measured & Indicated In-Situ (UG) 3.95 Mt Lead 1.43 % 56.5 kt
Measured & Indicated In-Situ (OP) 6.24 Mt Copper 0.05 % 3.1 kt
Measured & Indicated In-Situ (UG) 3.95 Mt Copper 0.32 % 12.8 kt
Measured & Indicated In-Situ (OP) 6.24 Mt Silver 30.5 g/t 6,124 koz
Measured & Indicated In-Situ (UG) 3.95 Mt Silver 73.5 g/t 9,338 koz
Measured & Indicated In-Situ (OP) 3.95 Mt Gold 0.15 g/t 29.4 koz
Inferred In-Situ (OP) 1.68 Mt Zinc 1.11 % 18.6 kt
Inferred In-Situ (UG) 7.37 Mt Zinc 3.67 % 270.5 kt
Inferred In-Situ (OP) 1.68 Mt Lead 0.83 % 13.9 kt
Inferred In-Situ (UG) 7.37 Mt Lead 0.87 % 64.1 kt
Inferred In-Situ (OP) 1.68 Mt Copper 0.03 % 0.5 kt
Inferred In-Situ (UG) 7.37 Mt Copper 0.4 % 29.5 kt
Inferred In-Situ (OP) 1.68 Mt Silver 29.2 g/t 1,577 koz
Inferred In-Situ (UG) 7.37 Mt Silver 56.7 g/t 13,426 koz
Inferred In-Situ (OP) 7.37 Mt Gold 0.31 g/t 16.7 koz

Commodity Production Costs:

CommodityUnits201920182017
Cash costs Zinc USD  ......  Subscription required†  ......  Subscription required† -0.09 / lb†
† Net of By-Product.
Subscription required - Subscription is required.

Financials:

Units201920182017
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
EBITDA M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jan 29, 2021
....................... Subscription required ....................... Subscription required Subscription required Jan 29, 2021
....................... Subscription required ....................... Subscription required Subscription required Jan 29, 2021
....................... Subscription required ....................... Subscription required Subscription required Jan 29, 2021
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2018
Subscription required 2017
Subscription required 2016
Subscription required 2015

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 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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Aerial view:

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