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Peru
Uchucchacua Mine

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 Location:
9 km NE from Oyon, Peru

  Address:
Las Begonias 415, 20th Floor. San Isidro
Lima
Peru
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StatusTemporary Suspension
Mine TypeUnderground
Commodities
  • Silver
  • Zinc
  • Lead
  • Manganese
Mining Method
  • Bench & Fill
  • Overhand Cut & Fill
  • Backfill
Processing
  • Flotation
October 15, 2021 - Compañia de Minas Buenaventura S.A.A. (“Buenaventura” or “the Company”), Peru’s largest publicly-traded precious metals mining company, today announced that the Company has submitted a request to the Peruvian minister for mines and energy (MINEM) for the temporary suspension of mining and ore processing activities at its Uchucchacua mine. Operations were previously suspended due to a local community strike initiated on September 13, 2021, announced by the Company on September 21, 2021. Buenaventura has requested an extended suspension of operations as it has identified an important opportunity to meaningfully improve efficiency and profitability at its Uchucchacua operations. Mining and ore processing activities will therefore be suspended until the Company’s related goals and objectives have been fully achieved.
Latest NewsBuenaventura Announces Temporary Suspension of Production at Uchucchacua Mine     October 15, 2021


Owners

Source: p. 53
CompanyInterestOwnership
Compania de Minas Buenaventura S.A.A. 100 % Direct
The Uchucchacua mine is wholly-owned and operated by Buenaventura.

Deposit Type

  • Mesothermal
  • Vein / narrow vein


Summary:

The Uchucchacua mineral structures are hosted by Mesozoic limestone of the Jumasha Formation and are classified as a mesothermal polymetallic deposit of silver-lead-zinc with important contents of manganese. The main mineralized structures are veins and ore bodies with high-grade silver content.

This is a silver-bearing deposit with base metals and a high content of manganese hosted in the carbonate rock of the Jumasha Formation from the Upper Cretaceous, related to intrusives from the Miocene. It consists of veins and replacement bodies associated with systems of NE-SW, E-W, and NW-SE structures. Of particular note are the Uchucchacua, Socorro-Cachipampa, Rosa, and Sandra faults, among others. Mineralogy is varied and complex, with the occurrence of silver in sulfides and sulfosalts, with abundant alabandite and manganese calcium silicates. Lead and zinc increase in proximity to the intrusives.


Mining Methods

  • Bench & Fill
  • Overhand Cut & Fill
  • Backfill


Summary:

There are three mines in exploitation—Socorro, Carmen, and Huantajalla—whose production is extracted via the Luz and Master shafts. The exploitation methods used include overhand cut and fill and bench and fill, both mechanized, using low-profile equipment. The ore is transported by rail using locomotives and mining cars to the loading areas in the shaft, and to the concentration plant. The main access tithe mining areas is gained through a descending ramp. The barren material is recirculated as backfill to the pits, and the excess material is transported to the barren material deposit located on the surface. For the ventilation of the work, there are three main fans with a capacity of 300,000 cfm, and secondary fans for the explorations and developments. For mine drainage, there are two water pumping stations in series, with a capacity of 1,000 and 750 l/s, respectively, that evacuate water to level 4120, which exits to the surface through the Patón Tunnel, which measures 4.2 km long.


Crushing and Grinding


Processing

  • Flotation

Source: Subscription required

Summary:

The metallurgical process at Uchucchacua consists of two circuits: circuit 1 consisting of primary crushing, grinding, flotation of minerals where lead-silver, zinc-silver and pyrite concentrates are obtained, and the circuit 2 consisting of a primary crushing, secondary crushing, grinding, flotation of minerals where lead-silver, zinc-silver and pyrite concentrates are obtained. Concentrates with high manganese content produced by Uchucchacua are treated at the Río Seco leaching plant, for subsequent sale.

Recoveries & Grades:

CommodityParameter2020201920182017201620152014
Silver Recovery Rate, %  ......  Subscription required  ......  Subscription required87.482.58483.981.7
Silver Head Grade, g/t  ......  Subscription required  ......  Subscription required388.17458.15473.71460.33452.87
Zinc Recovery Rate, %  ......  Subscription required  ......  Subscription required
Zinc Head Grade, %  ......  Subscription required  ......  Subscription required2.231.81.171.051.04
Lead Recovery Rate, %  ......  Subscription required  ......  Subscription required
Lead Head Grade, %  ......  Subscription required  ......  Subscription required1.61.360.930.820.81

Production:

CommodityProductUnits2020201920182017201620152014
Silver Metal in concentrate oz  ......  Subscription required  ......  Subscription required15,420,10216,583,69816,212,74613,919,92212,055,570
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
Manganese Sulphate t  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Operational Metrics:

Metrics202020192018201720162015
Ore tonnes mined  ......  Subscription required1,335,018 t1,387,775 t1,364,478 t1,267,752 t1,121,474 t
Tonnes milled  ......  Subscription required1,335,018 t1,387,775 t1,364,478 t1,267,752 t1,121,474 t
Daily processing capacity  ......  Subscription required4,000 t4,000 t4,000 t3,860 t3,800 t
Subscription required - Subscription is required.

Reserves at December 31, 2020:

CategoryTonnage CommodityGradeContained Metal
Proven & Probable 7,617 kt Silver 9.67 oz/t 73,662 koz
Proven & Probable 7,617 kt Zinc 1.93 % 147 kt
Proven & Probable 7,617 kt Lead 1.11 % 85 kt
Measured & Indicated 2,335 kt Silver 9.79 oz/t 22,865 koz
Measured & Indicated 2,335 kt Zinc 2.063 % 48 kt
Measured & Indicated 2,335 kt Lead 1.201 % 28 kt

Commodity Production Costs:

CommodityUnits202020192018201720162015
Cash costs (sold) Lead USD  ......  Subscription required  ......  Subscription required 1,354 / t 1,571 / t 1,214 / t 1,548 / t
Cash costs (sold) Zinc USD  ......  Subscription required  ......  Subscription required 1,983 / t 2,951 / t 2,223 / t 2,426 / t
Cash costs (sold) Silver USD  ......  Subscription required  ......  Subscription required 10.4 / oz 10.6 / oz 11 / oz 13.9 / oz
Subscription required - Subscription is required.

Financials:

Units202020192018201720162015
Capital expenditures M USD  ......  Subscription required  ......  Subscription required18.4   18.1   28.9   20.2  
Revenue M USD  ......  Subscription required  ......  Subscription required257.3   272.3   240.5   166.1  
Operating Income M USD  ......  Subscription required  ......  Subscription required6.3   38.7   54.6   -17.8  
Gross profit M USD  ......  Subscription required  ......  Subscription required56.1   75.8   70.3   -5.4  
Pre-tax Income M USD  ......  Subscription required  ......  Subscription required6.2   38.5   54.1   -17.5  
After-tax Income M USD  ......  Subscription required  ......  Subscription required5.4   37.4   52.2   -18  
Subscription required - Subscription is required


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required May 21, 2021
....................... Subscription required ....................... Subscription required Subscription required May 21, 2021
....................... Subscription required ....................... Subscription required Subscription required May 21, 2021
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2020
Subscription required Subscription required Subscription required 2019
Subscription required Subscription required Subscription required 2018
Subscription required 2017
Subscription required 2016

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
Annual Report 2018
Form 20-F 2018
Press Release 2018
Quarterly Report 2018
Form 20-F 2017
Annual Report 2016
Form 20-F 2016
Press Release 2016
Form 20-F 2015
Subscription required - Subscription is required.

News:

NewsDate
Buenaventura Announces Temporary Suspension of Production at Uchucchacua Mine October 15, 2021
Buenaventura Announces Strike at Uchucchacua Mine September 22, 2021

Aerial view:

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