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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
Phone  ...  Subscription required
Fax+511-437-5009
WebsiteWeb
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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
  • Cut & Fill
  • Transverse open stoping
  • Sub-level Retreat
  • Cemented backfill
Processing
  • Smelting
  • Calcining
  • Agitated tank (VAT) leaching
  • Counter current decantation (CCD)
  • Merrill–Crowe
  • Cyanide (reagent)
Mine Life11.3 years (as of Jan 1, 2015)


Owners & OPERATOR

Source:
CompanyInterestOwnership
Hochschild Mining Plc. 100 % Indirect
Compañía Minera Ares S.A.C. (operator) 100 % Direct
The concession rights and interests in Inmaculada were owned by Minera Suyamarca S.A.C. (In 2014 Minera Suyamarca S.A.C. was absorbed by Compania Minera Ares S.A.C.), through which Hochschild Mining plc previously held a 60% controlling stake in Inmaculada, with the remaining 40% held by IMZ, under the terms of a joint venture agreement. After completion of the acquisition of IMZ in December 2013 the Inmaculada mine is now 100% owned directly by the Group (Hochschild Mining plc and subsidiary undertakings).

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 small amounts (generally <1%) of electrum, argentite, pyrargyrite, chalcopyrite, pyrite and marcasite.

The Angela Vein is composed of a gangue of white chalcedony, quartz, calcite (minor), smectite and illite. Metallic minerals, which rarely constitute more than 1% of the vein, occur as disseminations and colloform banding, and consist of pyrite, marcasite, argentite, pyrargyrite,chalcopyrite, sphalerite and electrum.


Mining Methods

  • Cut & Fill
  • Transverse open stoping
  • Sub-level Retreat
  • Cemented backfill


Summary:

- Production has historically come mainly from the Angela vein
- Exploitation areas are located mainly a t 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
Crusher / Mill TypeModelSizePowerQuantity
Jaw crusher 1.1m x 0.86m 1
SAG mill 6.4m x 3.1m 2000 kW 1
Ball mill 5.5m x 8.53m 4200 kW 1

Summary:

The process flowsheet includes single stage crushing, followed by grinding in a a SAG-ball (SAB) milling circuit, operated in close-circuit with cyclones.

• Ore from the underground mine is crushed using a primary jaw crusher with a close size setting of 115 mm and fed to a stock pile;
• A stock pile with live capacity of 1,920 t to provide crusher product surge capacity prior the SAG mill;
• A 2.0 MW SAG mill with pebble return;
• A 4.2 MW ball mill in closed circuit with hydrocyclones;

Crushing
Run-of-mine (ROM) ore will be dumped from haul trucks or a front-end loader through a 800 mm square-grid static grizzly into the 100 t capacity ROM hopper. Ore is recovered from the ROM bin by a vibrating pan feeder that reports directly to the 1.1 x 0.86 m single toggle jaw crusher. The jaw crusher is designed to operate with a closed side setting of 115 mm and crushes ore to 80% passing (P80) 93 mm. The primary crusher product is conveyed to the crushed ore stockpile.

The crushed ore stockpile will have a live capacity of 1,920 t or approximately 12 hours of mill feed. Three reclaim vibrating feeders will be installed at the base of the crushed ore stockpile to reclaim ore for milling.

Grinding
The grinding circuit selected by Ausenco will be a standard SAB configuration with provision to return SAG mill pebbles to the SAG mill feed. The reclaimed crushed ore will be fed at a controlled rate to a 6.40 m diameter by 3.05 m effective grinding length (EGL) SAG mill. The SAG mill will be equipped with a single 2,000 kW wound rotor induction motor variable speed drive system and single pinion, allowing the mill to operate at 60 - 80% of critical speed.

The ball mill will be equipped with a single 4,200 kW wound rotor induction motor, trommel screen and retractable feed spout/chute. The combined mills discharge slurry will be pumped to the mill cyclone cluster operating in closed circuit configuration with the ball mill. Pregnant solution from the clarifier overflow is added to the cyclone feed hopper to achieve the required cyclone feed pulp density. Mill cyclone underflow will gravitate to the ball mill feed, and cyclone overflow will gravitate to the leach feed vibrating trash screen.


Processing

  • Smelting
  • Calcining
  • Agitated tank (VAT) leaching
  • Counter current decantation (CCD)
  • Merrill–Crowe
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

The process plant and associated facilities will process run of mine (ROM) ore delivered to the primary crusher, to produce doré bars and tailing. The process encompasses crushing and grinding of the ROM ore, agitated tank cyanidation leaching, a Merril Crowe circuit and smelting of the precipitate to produce doré bars that are then shipped to a refinery for further processing. Following cyanide destruction, the leached taulings will be thickened before placement in the tailings storage facility (TFS) or used as mine backfill.

The flowsheet incorporates the following major process operations:
• Ore from the underground mine is crushed using a primary jaw crusher with a close size setting of 115 mm and fed to a stock pile;
• A stock pile with live capacity of 1,920 t to provide crusher product surge capacity prior the SAG mill;
• A 2.0 MW SAG mill with pebble return;
• A 4.2 MW ball mill in closed circuit with hydrocyclones;
• 7 x 4,085 m3 live ca ........

Recoveries & Grades:

CommodityParameter20192018201720162015
Silver Head Grade, g/t 163150145133115
Gold Head Grade, g/t 4.714.364.154.214.36

Production:

CommodityUnits202020192018201720162015
Silver koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required5,5064,9082,055
Gold koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Equivalent koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Equivalent koz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics20192018201720162015
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required1,306,606 t659,737 t
Daily processing capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required3,850 t
Subscription required - Subscription is required.

Reserves at December 31, 2019:

CategoryTonnage CommodityGradeContained Metal
Proven 2,326,765 t Silver 170 g/t 12.7 M oz
Proven 2,326,765 t Gold 4.3 g/t 324 koz
Proven 2,326,765 t Silver Equivalent 40.6 M oz
Probable 3,286,326 t Silver 111 g/t 11.8 M oz
Probable 3,286,326 t Gold 2.6 g/t 276.8 koz
Probable 3,286,326 t Silver Equivalent 35.6 M oz
Proven & Probable 5,613,091 t Silver 136 g/t 24.5 M oz
Proven & Probable 5,613,091 t Gold 3.3 g/t 600.7 koz
Proven & Probable 5,613,091 t Silver Equivalent 76.1 M oz
Measured & Indicated 5,583,000 t Silver 172 g/t 30.9 M oz
Measured & Indicated 5,583,000 t Gold 4.39 g/t 788.3 koz
Measured & Indicated 5,583,000 t Silver Equivalent 550 g/t 98.7 M oz
Inferred 10,368,000 t Silver 131 g/t 43.6 M oz
Inferred 10,368,000 t Gold 3.19 g/t 1,063 koz
Inferred 10,368,000 t Silver Equivalent 405 g/t 135.1 M oz

Commodity Production Costs:

CommodityUnits202020192018201720162015
Total cash costs Gold USD  ......  Subscription required  ......  Subscription required 486 / oz 370 / oz
Total cash costs Silver USD 5.2 / oz 4.6 / oz
All-in sustaining costs (AISC) Gold Equivalent USD  ......  Subscription required ^  ......  Subscription required  ......  Subscription required 721 / oz 646 / oz
All-in sustaining costs (AISC) Silver Equivalent USD  ......  Subscription required  ......  Subscription required 9.7 / oz 8.7 / oz 7.3 / oz
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operating Costs:

Units20192018201720162015
Total operating costs ($/t milled) USD 93.384.785.464.463.3

Financials:

Units201920182017201620152014
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 166.34   198.11  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 102.3  
Gross profit M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 49.8  
Pre-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 49.8  
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 49.8  
Subscription required - Subscription is required


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Dec 8, 2020
....................... Subscription required ....................... Subscription required Subscription required Dec 8, 2020
....................... Subscription required ....................... Subscription required Subscription required Dec 8, 2020
Subscription required - Subscription is required.


Corporate Filings & Presentations:

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

Subscription required - Subscription is required.

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