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Peru
Inmaculada Mine

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 Location:
206 km SW from Cusco, Peru

  Regional Office:
Calle La Colonia No. 180 Urb. El Vivero Santiago de Surco
Lima
Peru
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Fax+511-437-5009
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Silver
  • Gold
Mining Method
  • Longitudinal open stoping
  • Cut & Fill
  • Transverse open stoping
  • Cemented backfill
Production Start...
Mine Life11.3 years (as of Jan 1, 2015)
On November 19, 2021, Peru's government ruled out any operational extensions for Hochschild's flagship Inmaculada silver mine.
Peru's prime minister Mirtha Vasquez said the mines would be closed as soon as possible on environmental concerns, with "no extensions, whether for exploitation, exploration or even shutdown.

However, the Government subsequently affirmed its commitment to upholding the rule of law and acknowledged the continued rights of mining companies to request extensions and modifications of existing permits for mining and exploration activities.


Owners

Source: p. 17,70
CompanyInterestOwnership
Hochschild Mining Plc. 100 % Indirect
Compañía Minera Ares S.A.C. (operator) 100 % Direct
The Hochschild Mining Plc. holds 100% of Inmaculada gold/silver underground operation.

Contractors

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Deposit Type

  • Epithermal
  • Vein / narrow vein


Summary:

The Inmaculada deposits can be clasified as low to high sulfidation epithermal silver-gold deposits. Deposit sub-types on the Property includes LS type which includes the Au-Ag quartz veins at Quellopata including the Angela Vein, IS type and HS type which includes mineralized breccias at Minascucho, Central and San Salvador and disseminated mineralization at Tararunqui.

Rock chip sampling has shown that consistently high gold vaues (from 1 to over 10 g/t Au) are present in the Angela Vein, in the vicinity of line 10,000N of the local grid.

The Angela Vein outcrops in the central portion of the Quellopata vein system. The vein strikes northeasterly (050º), dips to the southeast (45º to 90º) and outcrops on surface along a strike lenght of 700 m.

The vein varies in thickness from 0.5 m to us much us 16.0 m, and has been tested over a vertical extent of up to 3000 m.

Two generations of mineralization have been observed in the Angela Vein, an early lead-zinc event and a later gold-silver event. The early mineralization consists of white quartz veinlets with sphalerite, galena, pyrite and argentite (minor). These veinlets form a broad, low-grade envelope (0.2 to 1.0% Pb + Zn) which surrounds, and overlaps, the Angela Vein mineralization.

The second mineralizing event at the Angela Vein is the most important economically, and consists of a white chalcedony vein with associated breccia and stockworks. The chalcedony contains s ........


Mining Methods

  • Longitudinal open stoping
  • Cut & Fill
  • Transverse open stoping
  • Cemented backfill


Summary:

- Production has historically come mainly from the Angela vein;
- Exploitation areas are located mainly at three different levels (4300, 4400, 4500m a.s.l);
- The mine has 3 main accesses, which are interconnected;
- Mining methods: Transversal Open Stoping, Longitudinal Open Stoping, Cut and Fill;
- The mine is backfilled with a mix of tailings and cement.


Crushing and Grinding
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Processing

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Summary:

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Production:

CommodityUnits2022202120202019201820172016
Silver Equivalent koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required18,58117,72116,948
Gold Equivalent koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver koz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold koz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
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Operational Metrics:

Metrics202120202019201820172016
Ore tonnes mined  ......  Subscription required  ......  Subscription required1,338,569 t1,323,525 t1,295,701 t1,306,606 t
Daily processing capacity  ......  Subscription required  ......  Subscription required3,850 t3,850 t3,850 t3,850 t
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Reserves at December 31, 2021:

CategoryTonnage CommodityGradeContained Metal
Proven & Probable 6,640,030 t Silver 147 g/t 31.4 M oz
Proven & Probable 6,640,030 t Gold 3.5 g/t 741.3 koz
Proven & Probable 6,640,030 t Silver Equivalent 84.7 M oz
Measured & Indicated 7,925,000 t Silver 169 g/t 43.2 M oz
Measured & Indicated 7,925,000 t Gold 4.13 g/t 1,052 koz
Measured & Indicated 7,925,000 t Silver Equivalent 467 g/t 118.9 M oz
Inferred 11,989,000 t Silver 102 g/t 39.2 M oz
Inferred 11,989,000 t Gold 2.57 g/t 988.7 koz
Inferred 11,989,000 t Silver Equivalent 286 g/t 110.3 M oz

Commodity Production Costs:

CommodityUnits2022202120202019201820172016
Total cash costs (sold) Silver USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 5.2 / oz  
Total cash costs (sold) Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 481 / oz   486 / oz   370 / oz  
Total cash costs (sold) Silver USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required†
Total cash costs (sold) Gold USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required†
All-in sustaining costs (sold) Silver Equivalent USD  ......  Subscription required&nbs  ......  Subscription required  ......  Subscription required  ......  Subscription required 9.9 / oz   9.7 / oz   8.7 / oz  
All-in sustaining costs (sold) Gold Equivalent USD  ......  Subscription required&nbs  ......  Subscription required  ......  Subscription required  ......  Subscription required 731 / oz   721 / oz   646 / oz  
^ Guidance / Forecast.
† Net of By-Product.
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Operating Costs:

Units2021202020192018201720162015
Total operating costs ($/t milled) USD 99.295.193.384.785.464.463.3

Financials:

Units202120202019201820172016
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 57.7   52.9   54.2  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 306.1   296.6   280.1  
Gross profit M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 116.7   74.9   98.7  
Pre-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 116.4   73.7   97.6  
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 116.4   73.7   97.6  
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Pipelines
TypeMaterialDiameterLengthDescription


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required May 10, 2022
....................... Subscription required ....................... Subscription required Subscription required May 10, 2022
....................... Subscription required ....................... Subscription required Subscription required May 10, 2022
....................... Subscription required ....................... Subscription required Subscription required May 10, 2022
....................... Subscription required ....................... Subscription required Subscription required May 10, 2022
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Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Corporate Presentation 2018
Annual Report 2017
Corporate Presentation 2017
Annual Report 2016
Corporate Presentation 2016
Annual Report 2015
Corporate Presentation 2015
Feasibility Study Report 2012
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