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Peru
Orcopampa (Chipmo) Mine

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 Location:
1 km SE from Orcopampa, Peru

  Address:
Las Begonias 415, 19th Floor, San Isidro
Lima
Peru
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WebsiteWeb
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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
  • Gold
  • Silver
Mining Method
  • Mechanized Cut & Fill
  • Bench & Fill
  • Overhand Cut & Fill
  • Sub-level stoping
  • Backfill
Production Start...
Mine Life2024
After 11 days of production stoppage, Buenaventura announced the restart of production at the Orcopampa mine as of December 27, 2022. Operations normalized after the cease of blockades near the entry of the affected mining units.

Gold production in 2023 is expected to exceed 2022 production due to an anticipated increase in 2023 throughput.


Owners

Source: p. 34
CompanyInterestOwnership
Compania de Minas Buenaventura S.A.A. (operator) 100 % Indirect
The Orcopampa mine is wholly-owned and operated by Buenaventura.

Contractors

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Deposit Type

  • Epithermal
  • Vein / narrow vein


Summary:

Deposit Types
The Chipmo mineralization is of hydrothermal type with quartz infill. This deposit can be classified as epithermal Au-Ag veins associated with tellurides, with intermediate and low sulfidation. These structures are located in calc-alkaline rocks that are rich in potassium (Sarpane Volcanic). Veinhosting faults appear to be deep and crustal (Villon, 2011)The major recognized structures are the Prometida, Nazareno and Pucara Sur veins and correspond to the N60°E system.

Mineralization
In general terms, mineralization in the area of Orcopampa is associated to calderas with subvolcanic intrusives, dikes in Miocene tuffs (Swanson, 1998); in the Ocoruro-Jaspe area, mineralized structures are related to the Sarpane complex, faults, and possibly to subvolcanic bodies with more than one event or pulses of mineralization.

Mineralization in Chipmo deposit is dominated by the occurrence of gold tellurides, mainly calaverite in high levels; petzite and hessite and native gold can be found in the central part. Copper sulfosalts and other gold-silver and bismuth tellurides occur subordinately. In general, mineralization is characterized by high Au/Ag ratios (>3) and low base metal concentrations, which are evident in the deep levels to the east. Its mineralogy is mainly composed of quartz in breccia, banded and replacement textures; there are also sulfides such as pyrite (leached), barite, gypsum, anhydrite and calcite. Alteration minerals inclu ........


Mining Methods

  • Mechanized Cut & Fill
  • Bench & Fill
  • Overhand Cut & Fill
  • Sub-level stoping
  • Backfill


Summary:

Orcopampa mine has been conceptualized for a production level of 1,500 tpd; historically, mining was conducted using the overhand cut and fill (OCF) method with detrital fill (the excess waste is transferred to the surface dump): in recent years, mining has been carried out using sublevel stoping in some sectors.

The mining method in Orcopampa’s underground mine is conventional and mechanized cut and fill (Breasting), this method is used to mine ore veins thickness from 0.8 to 5m. Mining is done by us and a service provider. The equipment used for development and exploration includes single-arm jumbos, bolters, scaler and scoop loaders (4yd3). The equipment used for conventional production are jacklegs, micro-electrical scoops (0.5-2yd3) and for mechanized are single-arm jumbos and diesel scoops loaders (2-4yd3). Ore haulage to surface is done with 20 and 35 m3 tipper trucks and 40m3 loading pocket in Nazareno’s and Prometida’s Shaft. Ore is taken to the process plant with 35 m3 tipper trucks.

The applied method is OCF, which is a selective mining method that is executed based on established geomechanical conditions. The design starts from an auxiliary ramp, which will run on the footwall. There are tilting windows are positioned towards the vein to cut it perpendicularly. The slope of the windows will depend on the maximum gradient allowed by the equipment that circulates through them, which is generally +/-15% . When cutting the vein through the tiltin ........


Crushing and Grinding
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Processing

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Summary:

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Production:

CommodityProductUnits2023202220212020201920182017
Gold Metal in conc./ doré koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required116191
Gold Concentrate kt  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Metal in conc./ doré oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
^ Guidance / Forecast.
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Operational Metrics:

Metrics202220212020201920182017
Daily milling capacity  ......  Subscription required  ......  Subscription required1,500 t1,500 t
Tonnes milled  ......  Subscription required  ......  Subscription required88,249 t127,079 t353,891 t500,580 t
Daily mining capacity  ......  Subscription required  ......  Subscription required
Ore tonnes mined  ......  Subscription required  ......  Subscription required88,249 t127,079 t353,891 t500,580 t
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Reserves at December 31, 2022:

CategoryTonnage CommodityGradeContained Metal
Probable 255,292 t Gold 9.48 g/t 77,810 oz
Probable 255,292 t Silver 4.35 g/t 35,741 oz
Indicated 343,167 t Gold 8.96 g/t 98,856 oz
Indicated 343,167 t Silver 24.66 g/t 272,075 oz
Inferred 373,446 t Gold 9.82 g/t 117,904 oz
Inferred 373,446 t Silver 15.48 g/t 185,862 oz

Commodity Production Costs:

CommodityUnits202220212020201920182017
Cash costs (sold) Silver USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 12.7 / oz   10 / oz  
Cash costs (sold) Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 1,020 / oz   743 / oz  
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Financials:

Units2022202120202019201820172016
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 6.2   12.7   3.5  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 153  
Operating Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required -15.4  
Gross profit M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 4   71.3   69.4  
Pre-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required -15.6   50.9   55  
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required -16.2  
Book Value M USD  ......  Subscription required
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Water Supply
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Heavy Mobile Equipment:
HME TypeSizeRef. Date
ANFO Loader Mar 15, 2022
Bolter Mar 15, 2022
Drill Mar 15, 2022
Drill jumbo (single boom) Dec 31, 2022
Grader Mar 15, 2022
Loader 40 cu. m Dec 31, 2022
Scaler Mar 15, 2022
Scoop Tram 4 cu. yd Dec 31, 2022
Shotcreter Mar 15, 2022
Tipper truck 20 cu. m Mar 15, 2022
Truck (underground) 10 cu. m Dec 31, 2022

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jun 23, 2023
....................... Subscription required ....................... Subscription required Subscription required Jun 23, 2023
....................... Subscription required ....................... Subscription required Subscription required Jun 23, 2023
....................... Subscription required ....................... Subscription required Subscription required Jul 4, 2023
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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 2017
Subscription required 2016

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2023
Annual Report 2022
Form 20-F 2022
Other 2022
Pre-Feasibility Study Report 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... 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
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