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Peru
Shahuindo Mine

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 Location:
29 km NW from Huamachuco, Peru

  Regional Office:
Ave. 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 TypeOpen Pit
Commodities
  • Gold
  • Silver
  • Silver Equivalent
Mining Method
  • Truck & Shovel / Loader
Processing
  • Filter press plant
  • Dewatering
  • Smelting
  • ROM/dump leach
  • Carbon in column (CIC)
  • Carbon adsorption-desorption-recovery (ADR)
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life2028
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.

During the suspension circulation of process solutions on the heap leach pads continued.

Open pit mining and run-of-mine heap leach activities at Shahuindo resumed on May 15, 2020 at reduced capacities to accommodate physical distancing restrictions.
Latest NewsPan American Silver Announces Temporary Suspension of Operations in Peru Following Government Declared State of Emergency     March 17, 2020


Owners

Source: p. 94
CompanyInterestOwnership
Pan American Silver Corp. 100 % Indirect
Ownership Tree

Deposit Type

  • Epithermal
  • Sediment-hosted


Summary:

The Shahuindo deposit is located on the eastern flank of the Andean Western Cordillera in northern Peru, within a regional fold and thrust belt of predominantly sedimentary rocks. The region is particularly wellendowed with mineral occurrences polymetallic and epithermal deposits.

Mineralization at Shahuindo is best described as an intermediate-sulfidation epithermal system, though highsulfidation mineralization occurs at depth and in the core of hydrothermal breccias. Oxidation of mineralization extends to a depth of 150 metres below surface. In the weathered oxide facies, gold and silver are associated with the presence of jarosite and hematite. In the underlying fresh sulfide facies, gold is typically extremely fine grained with the related mineral species not yet identified.

The principal zone of mineralization in the Shahuindo district occurs in a belt between two large-amplitude regional-scale folds, the Algamarca anticline and the San Jose anticline. The Algamarca anticline is upright and symmetrical with amplitude of at least 400m, whereas the San Jose fold is an asymmetric, overturned, northeast-vergent fold with a shallowly dipping axial surface and amplitude of at least 300m. Important structural elements include fold limbs and fold axial surfaces, fold-related fractures, faults and related extension fractures, breccia dikes and irregular bodies, and igneous intrusive contacts.

The Shahuindo deposit formed in a predominantly intermediate-sulfidation epithermal system of probable Miocene age. Distinguishing characteristics of an intermediate-sulfidation environment include mineral assemblages indicating a sulfidation state between those of high and low sulfidation types, relatively high total sulfide content of five to ten percent in the sulfide environment, presence of silver sulfosalts, and association with andesitic to dacitic volcanics. Magmatic associated fluids are implied. There is no evidence of adularia at Shahuindo, thus ruling out a low-sulfidation environment. There are some observances of enargite at depth, suggesting a mixed intermediate- to high-sulfidation system.

Both structure and lithology control the location, shape, and orientation of the mineralization. The mineralization is hosted within the siliciclastic sandstone-dominant Farrat formation and the underlying sedimentary Carhuaz formation. These sedimentary rocks have been intruded by at least three felsic stocks which tend to be located along faults and cores of anticlinal structures. In addition, the metallurgical recovery of gold is affected by lithology with the identification of five primary geometallurgical domains based on the relationship between lithology and grain size and gold recovery. Modelling the distribution and occurrence of lithologic units / geometallurgical domains is critical to mine planning.


Mining Methods

  • Truck & Shovel / Loader


Summary:

Mining at the Shahuindo mine is by standard open pit methods using shovels, loaders, and dump trucks.


Crushing and Grinding


Processing

  • Filter press plant
  • Dewatering
  • Smelting
  • ROM/dump leach
  • Carbon in column (CIC)
  • Carbon adsorption-desorption-recovery (ADR)
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

The Shahuindo mine uses conventional cyanide heap leaching and a carbon-in-column adsorption- desorption-regeneration (“ADR”) process to produce a precipitate that is smelted to gold and silver doré. Average throughput is 36,000 tpd. A 36,000 tpd crushing and agglomeration plant is also available but is currently not in use.

After the ore is placed on the leach pad, a diluted cyanide leach solution is sprayed onto each leach pad cell for a nominal period of 60 days. The pregnant solution flows onto the geomembrane underlying the pad to a central collection point and into the pregnant solution pond. Pontoon mounted pumps in this pond are used to pump the solution to the ADR plant. The process includes absorption onto carbon pellets and desorption in high caustic/high temperature leach columns. The carbon is sent to regeneration and the enriched solution is sent to electro-winning cells where a cathode is used to produce a fine-grained precipitate. The precipitate is filtered ........

Recoveries & Grades:

CommodityParameter2020201920172016Avg. LOM
Gold Head Grade, g/t  ......  Subscription required  ......  Subscription required0.610.870.53
Silver Head Grade, g/t  ......  Subscription required  ......  Subscription required6.86

Production:

CommodityUnits202120202019201820172016
Gold koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required847948
Silver 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:

Metrics2020201920172016
Tonnes processed  ......  Subscription required11,219 kt5,360 kt3,153 kt
Daily processing rate  ......  Subscription required36,000 t
Ore tonnes mined  ......  Subscription required6,479 kt5,531 kt
Stripping / waste ratio  ......  Subscription required1 0.66
Daily ore mining rate  ......  Subscription required17,800 t10,000 t
Subscription required - Subscription is required.

Reserves at June 30, 2020:

CategoryOreTypeTonnage CommodityGradeContained Metal
Proven Total 74.8 Mt Gold 0.5 g/t 1,201 koz
Proven Total 74.8 Mt Silver 7 g/t 16.1 M oz
Probable Total 49.6 Mt Gold 0.47 g/t 750.6 koz
Probable Total 49.6 Mt Silver 7 g/t 10.4 M oz
Measured Total 11 Mt Gold 0.25 g/t 87.9 koz
Measured Total 11 Mt Silver 5 g/t 1.7 M oz
Indicated Total 17.4 Mt Gold 0.25 g/t 142.3 koz
Indicated Total 17.4 Mt Silver 4 g/t 2.2 M oz
Inferred Sulphide 12 Mt Gold 0.52 g/t 201.8 koz
Inferred Oxide 97.4 Mt Gold 0.74 g/t 2,323 koz
Inferred Sulphide 12 Mt Silver 7 g/t 2.8 M oz
Inferred Oxide 97.4 Mt Silver 14 g/t 45.1 M oz

Commodity Production Costs:

CommodityUnits20212020201920172016
Cash costs (sold) Gold USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required†
Total cash costs Gold USD 692 / oz 796 / oz
Total cash costs Gold USD 668 / oz† 775 / oz†
All-in sustaining costs (sold) Gold USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required†
All-in sustaining costs (AISC) Gold USD 1,124 / oz† 1,162 / oz†
^ Guidance / Forecast.
† Net of By-Product.
Subscription required - Subscription is required.

Operating Costs:

Units2017
OP mining costs ($/t milled) USD 3.36
Processing costs ($/t milled) USD  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required
Subscription required - Subscription is required.

Financials:

Units20212020201920172016
Capital expenditures (planned) M USD  ......  Subscription required
Sustaining costs M USD  ......  Subscription required  ......  Subscription required 22.2   11  
Capital expenditures M USD  ......  Subscription required  ......  Subscription required 69.4   63.9  
Revenue M USD  ......  Subscription required  ......  Subscription required 95.4   47.2  
Operating Income M USD  ......  Subscription required  ......  Subscription required 30.1   12  
Subscription required - Subscription is required


Proposed Heavy Mobile Equipment as of January 25, 2016:
HME TypeModelSizeQuantity
Dozer ....................... Subscription required
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....................... Subscription required ....................... Subscription required ....................... Subscription required
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Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required May 6, 2021
....................... Subscription required ....................... Subscription required Subscription required May 6, 2021
....................... Subscription required ....................... Subscription required Subscription required May 6, 2021
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
Management Discussion & Analysis 2018
Press Release 2018
Annual Information Form 2017
Financial Review 2017
Management Discussion & Analysis 2017
Annual Information Form 2016
Feasibility Study Report 2016
Financial Review 2016
Management Discussion & Analysis 2016
Sustainability Report 2016
Annual Information Form 2015
Management Discussion & Analysis 2015
Feasibility Study Report 2012
Subscription required - Subscription is required.

News:

NewsDate
Pan American Silver Announces Temporary Suspension of Operations in Peru Following Government Declared State of Emergency March 17, 2020
Tahoe Resources Reports Incident During Commissioning At Shahuindo Mine February 12, 2018

Aerial view:

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