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Peru
Huaron Mine

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 Location:
39 km SW from Cerro De Pasco, Peru

  Regional Office:
La Floresta 497 Of. 301 Charcarilla del Estanque San Borja
Lima
Peru
Phone  ...  Subscription required
Fax+51-1-618-9729
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
  • Silver
  • Zinc
  • Lead
  • Copper
  • Gold
Mining Method
  • Sub-level stoping
Processing
  • Filter press plant
  • Flotation
Mine Life12.9 years (as of Jan 1, 2014)
On March 15, 2020, the government of Peru declared a State of Emergency, requiring a national quarantine and suspension of non-essential activities including mining. To comply with the order, the Company temporarily suspended operations at its four Peruvian mines.

Operations resumed at Huaron and Morococha on June 7, 2020 and June 23, 2020, respectively; however, both mines were returned to care and maintenance on July 20, 2020 in response to several workers at the mines testing positive for COVID-19. Following intensive health screenings and testing for the virus that were developed and deployed at Shahuindo and La Arena during July and August 2020, the Company began gradually redeploying its workforce at Huaron and Morococha over last two weeks of September 2020.
Latest NewsPan American Silver Reports Mineral Reserves and Mineral Resources as at June 30, 2021     August 10, 2021


Owners

Source: p. 94
CompanyInterestOwnership
Pan American Silver Corp. 100 % Indirect
Pan American Silver Huaron S.A (operator) 100 % Direct
Ownership Tree

Deposit Type

  • Intrusion related
  • Vein / narrow vein
  • Hydrothermal


Summary:

The Huaron mine is located within the Western Cordillera of the Andes Mountains and the regional geology is dominated by Machay Group limestones and Pocobamba continental sedimentary rocks. These groups have been deformed by the Huaron anticline, the dominant structural feature of the area. The limestones and sedimentary rocks are strongly folded and intruded by quartz monzonites and quartz monzonite dikes with associated fracturing. Following the intrusion of the dikes, the sedimentary rocks were further compressed and fractured, and the fractures were subsequently mineralized by hydrothermal fluids.

The main lithology in the area of Huaron is a sequence of continental redbeds which unconformably overlie massive marine limestones. North-south trending sub-vertical porphyritic quartz monzonite dykes crosscut the mine stratigraphy. The Huaron mine is located within an anticline with an axis striking approximately north-south and plunging gently to the north. There are two main fault systems. One system comprises north-south striking thrust faults, parallel to the axis of the anticline, and the other comprises east-west striking tensional faults.

The Huaron mine is a hydrothermal polymetallic deposit of silver, lead, zinc, and copper mineralization hosted within structures likely related to the intrusion of monzonite dikes, principally located within the Huaron anticline. Mineralization is encountered in veins parallel to the main fault systems, in replacement bodies known as “mantos” associated with the calcareous sections of the conglomerates and other favourable stratigraphic horizons, and as dissemination in the monzonitic intrusions at vein intersections.

The mineralized veins vary from a few centimetres to up to 10 metres wide, and may extend along strike for up to 1,800 metres. Vein orientations vary but generally trend east-west or north-south.


Mining Methods

  • Sub-level stoping


Summary:

Mining is undertaken using primarily mechanized sub-level long hole stoping methods. Ore is brought to the surface using haul trucks, electric locomotives, or hoisted through a shaft.


Crushing and Grinding
Crusher / Mill TypeModelSizePowerQuantity
Jaw crusher 1
Cone crusher ....................... Subscription required 4.25' 2
Ball mill 12' x 16' 1
Ball mill 8' x 8' 1
Ball mill 6.5' x 14' 1

Summary:

Crushing
Ore is delivered from the mine to a 15,000 tonne capacity stockpile where the material is separated by metallurgical characteristic to obtain an optimal ore blend for processing through the plant. The blended material is fed into a 100 tonne capacity coarse ore bin and then via an apron feeder to a vibrating grizzly. The oversize from the grizzly is reduced in size by a jaw crusher to 3.5 inches and joins the undersize via conveyor to a vibrating screen. The oversize material reports to a secondary crusher where it is reduced to a 2.5 inch product size by a 4.25 foot Symons standard cone crusher and then joins the undersize via conveyor to another vibrating screen. The undersize material reports to a tertiary 4.25 foot Symons short head cone crusher where it is reduced in size to 100% passing one quarter inch. The final crushed product travels by conveyor belt equipped with an electromagnetic separator and metal detector for storage in three 300 tonne capacity fine ore bins prior to entering the grinding circuit.

Grinding and classification
The grinding circuit consists of a 12 foot diameter by 16 foot long primary ball mill operating in an open circuit with two parallel secondary ball mills, one 8 foot diameter by 8 foot long and the other 6.5 foot diameter by 14 foot long. The 6.5 foot diameter by 14 foot long mill was added to the process flowsheet at the end of 2013 and allows for increased processing throughput to 870,000 tonnes per annum at the target final product particle size. The milled product from the primary and secondary ball mills reports to a classification hydrocyclone nest of two units of 20 inches diameter each. The hydrocyclone is in close circuit with the secondary ball mills and the overflow of the hydrocyclone classification is treated in a third stage 8 foot diameter by 3 foot long mill. The third stage grinding is in close circuit with a hydrocyclone nest of four units of 12 inches diameter each. The final milled product is approximately 60% at minus 200 mesh, approximately 30% at between 65 and 200 mesh, and approximately 10% at plus 65 mesh.


Processing

  • Filter press plant
  • Flotation

Source: Subscription required

Summary:

The Huaron mine operates a 2,900 tpd nominal capacity mill using froth induced flotation technology to produce silver in copper, lead, and zinc concentrates. Metallurgical recoveries average approximately 84% for silver, 77% for zinc, 76% for lead, and 76% for copper.

The mill flowsheet consists of three-stage crushing, ball mill grinding, and selective flotation of the ore to concentrates, followed by thickening and filtering of the concentrates.

Flotation
The pulp from the grinding circuit is fed to the flotation circuit. The flotation circuit includes an initial stage of depression of zinc and flotation of a bulk concentrate. The bulk concentrate consists of lead and copper and is treated with sodium dichromate to separate and produce a silver rich lead and copper concentrate. The tailings from the bulk flotation are activated and conditioned with copper sulphate and lime to modify the pH and to produce a zinc concentrate. The bulk flotation occurs in two ........

Recoveries & Grades:

CommodityParameter2020201920182017201620152014
Silver Recovery Rate, %  ......  Subscription required  ......  Subscription required82.785.284.183.283.2
Silver Head Grade, g/t  ......  Subscription required  ......  Subscription required142146157157154
Zinc Recovery Rate, %  ......  Subscription required  ......  Subscription required7677.674.363.868.1
Zinc Head Grade, g/t  ......  Subscription required  ......  Subscription required2.442.73.012.412.41
Lead Recovery Rate, %  ......  Subscription required  ......  Subscription required73.277.779.473.171.5
Lead Head Grade, %  ......  Subscription required  ......  Subscription required1.181.231.511.080.97
Copper Recovery Rate, %  ......  Subscription required  ......  Subscription required76.978.575.578.577.5
Copper Head Grade, %  ......  Subscription required  ......  Subscription required0.760.840.90.970.86
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required

Production:

CommodityUnits2021202020192018201720162015
Silver koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required3,5613,6843,8123,705
Gold koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Zinc kt  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Lead kt  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Copper kt  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in concentrate. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202020192018201720162015
Tonnes milled  ......  Subscription required994 kt935 kt928.1 kt904.4 kt894.5 kt
Daily milling capacity  ......  Subscription required2,900 t
Annual milling capacity  ......  Subscription required870,000 t
Daily milling rate  ......  Subscription required2,500 t
Subscription required - Subscription is required.

Reserves at June 30, 2020:

CategoryTonnage CommodityGradeContained Metal
Proven 6.9 Mt Silver 164 g/t 36.3 M oz
Proven 6.9 Mt Zinc 3.03 %
Proven 6.9 Mt Lead 1.44 %
Proven 6.9 Mt Copper 0.77 %
Probable 3.6 Mt Silver 169 g/t 19.8 M oz
Probable 3.6 Mt Zinc 3.07 %
Probable 3.6 Mt Lead 1.6 %
Probable 3.6 Mt Copper 0.31 %
Measured 1.8 Mt Silver 161 g/t 9.5 M oz
Measured 1.8 Mt Zinc 3.02 %
Measured 1.8 Mt Lead 1.65 %
Measured 1.8 Mt Copper 0.18 %
Indicated 2.4 Mt Silver 155 g/t 11.8 M oz
Indicated 2.4 Mt Zinc 2.85 %
Indicated 2.4 Mt Lead 1.64 %
Indicated 2.4 Mt Copper 0.61 %
Inferred 5.8 Mt Silver 157 g/t 29 M oz
Inferred 5.8 Mt Zinc 2.83 %
Inferred 5.8 Mt Lead 1.55 %
Inferred 5.8 Mt Copper 0.45 %

Commodity Production Costs:

CommodityUnits2021202020192018201720162015
Cash costs (sold) Silver USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required† 1.63 / oz† 1.35 / oz† 5.79 / oz† 10.9 / oz†
Total cash costs (sold) Silver USD
All-in sustaining costs (sold) Silver USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required† 7.73 / oz† 5.25 / oz† 11.1 / oz† 16.9 / oz†
^ Guidance / Forecast.
† Net of By-Product.
Subscription required - Subscription is required.

Financials:

Units2021202020192018201720162015
Capital expenditures (planned) M USD  ......  Subscription required
Capital expenditures M USD  ......  Subscription required  ......  Subscription required14.6   8.4   8.9   11.1  
Revenue M USD  ......  Subscription required  ......  Subscription required114.7   129.1   105.7   75.7  
Operating Income M USD  ......  Subscription required  ......  Subscription required26.5  
Pre-tax Income M USD 24.3   36.6   24.1   -3.4  
After-tax Income M USD 13.7   23.8   14   -5.7  
Subscription required - Subscription is required


Heavy Mobile Equipment as of June 30, 2014:
HME TypeModelSizeQuantity
Bolter ....................... Subscription required
Drill (long hole) ....................... Subscription required
Drill jumbo (single boom) ....................... Subscription required
Scissor Lift 2.7 t ....................... Subscription required
Scoop Tram 1.5 cu. yd ....................... Subscription required
Scoop Tram 2.2 cu. yd ....................... Subscription required
Scoop Tram 4 cu. yd ....................... Subscription required
Truck (haul) 20 ....................... Subscription required
Truck (haul) ....................... Subscription required 25 t ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required May 3, 2021
....................... Subscription required ....................... Subscription required Subscription required May 3, 2021
....................... Subscription required ....................... Subscription required Subscription required May 3, 2021
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Information Form 2018
Annual Report 2018
Press Release 2018
Year-end Mineral Reserves 2018
Annual Information Form 2017
Annual Report 2017
Financial Review 2016
Management Discussion & Analysis 2016
Management Discussion & Analysis 2015
Management Discussion & Analysis 2014
Technical Report 2014
Subscription required - Subscription is required.

News:

NewsDate
Pan American Silver Reports Mineral Reserves and Mineral Resources as at June 30, 2021 August 10, 2021

Aerial view:

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