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Peru
La Arena Sulphide expansion Project (La Arena)

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 Location:
13 km SW from Huamachuco, Peru

  Project Contacts:
Ave. La Floresta 497 Of. 103 Charcarilla del Estanque
San Borja
Lima
Peru
Phone  ...  Subscription required
Fax+51-1-618-9729
WebsiteWeb
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Overview

StagePreliminary Economic Assessment
Mine TypeOpen Pit
Commodities
  • Gold
  • Copper
Mining Method
  • Truck & Shovel / Loader
Mine Life21 years (as of Jan 1, 2018)


Owners

Source: p. 86
CompanyInterestOwnership
Pan American Silver Corp. 100 % Indirect
Ownership Tree

Contractors

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Deposit Type

  • Porphyry


Summary:

Two types of mineralized deposits are recognized at the La Arena property – high sulfidation epithermal gold deposits (La Arena mine) and porphyry-hosted copper-gold deposits (La Arena II project).

In porphyry deposits, the sulfide ore minerals are dominantly structurally-controlled, with most mineralization occurring as close-spaced and cross-cutting vein stockwork, vein arrays, fractures, breccias and disseminations. In the hypogene portions of copper porphyry deposits, the copper occurs predominantly as chalcopyrite; other important copper ore minerals may include bornite and enargite. Supergene copper mineralization is generally dominated by chalcocite and lesser covellite.

Porphyry-hosted Copper-Gold Mineralization
Copper-gold mineralization is associated with phyllic (quartz-sericite) and potassic (secondary biotite + magnetite + potassium feldspar) alterations, which is dominated principally by pyrite and chalcopyrite with lesser amounts of bornite, covellite, chalcocite and molybdenite. Mineral zoning from surface downwards below the oxidized cap is typically about 40 to 50 meters for the zone of secondary enrichment (chalcocite + covellite ± copper oxides) and ten to 40 meters for the mixed oxide-sulfide transitional zone (chalcocite + chalcopyrite ± covellite). The top of the primary sulfide mineralized zone (chalcopyrite ± bornite) which predominates at La Arena is typically located at depths in excess of 100 meters from the surface.


Mining Methods

  • Truck & Shovel / Loader


Summary:

the La Arena II Project open pit to be mined by conventional drill, blast, truck and shovel methods. The mining fleet will consist of 320 tonne class haul trucks, 55 m3 electric cable shovels and 20 m3 wheel loaders. Blasthole drilling will be performed by diesel powered rotary single pass track drills. Rubber tired dozers will take care of cleanup near the shovels. Haul road and dump maintenance will be performed by a fleet of motor graders, track dozers and water trucks.

The design bench height is 16 meters. Double benching will be applied with a catch bench 10.5 meters wide in sediment rock type and 9.5 meters in the porphyry rock type. Inter-ramp wall angles will be 47.8° in sediments and 48.8° in porphyry.

Ramps are designed to be 34 meters wide including berms and ditches with a driving width of 27 meters. The crusher and mill facility will be located between the pit and the leach/tailings facility at the 3495 m elevation.

The crest of the pit ranges from 3578 m elevation on the west side to 3274 m elevation on the east side. The pit bottom elevation is 2476 m. The overall final pit dimensions are 2440 m in length by 2120 m wide.

The La Arena II Project open pit will be developed in three stages. The first stage was designed to deliver the majority of the oxide material to the leach pad earlier in the mine life and at the same time deliver 80,000 tonnes per day to the mill.

The mine plan was developed to deliver ........


Crushing and Grinding
Source: Subscription required

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Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Projected Production:

CommodityProductUnitsAvg. AnnualLOM
Gold Metal in doré koz 574
Gold Metal in concentrate koz 2,623
Gold Payable metal koz 1423,197
Copper Concentrate kt  ......  Subscription required
Copper Metal in concentrate M lbs  ......  Subscription required  ......  Subscription required

Operational Metrics:

Metrics
Stripping / waste ratio 2.79 *
Annual mining capacity 132 Mt *
Waste tonnes, LOM 1,911,466 kt *
Ore tonnes mined, LOM 685,961 kt *
Total tonnes mined, LOM 2,597,427 kt *
Plant annual capacity 28.8 Mt *
Daily processing capacity 80,000 t *
Tonnes processed, LOM 685,961 kt *
* According to 2018 study.

Reserves at June 30, 2021:

CategoryOreTypeTonnage CommodityGradeContained Metal
Measured Total 154.2 Mt Gold 0.25 g/t 1,257 koz
Measured Total 154.2 Mt Copper 0.38 %
Indicated Total 556.6 Mt Gold 0.23 g/t 4,061 koz
Indicated Total 556.6 Mt Copper 0.37 %
Inferred Total 71 Mt Gold 0.21 g/t 486.7 koz
Inferred Total 71 Mt Copper 0.2 %

Commodity Production Costs:

CommodityUnitsAverage
Cash costs Copper USD 1.55 / lb *  
Cash costs Gold USD 600 / oz *  
Assumed price Copper USD 3.3 / lb *  
Assumed price Gold USD 1,300 / oz *  
* According to 2018 study / presentation.

Operating Costs:

Units2018
OP mining costs ($/t mined) USD 1.33
OP mining costs ($/t milled) USD  ......  Subscription required
Processing costs ($/t milled) USD  ......  Subscription required
G&A ($/t milled) USD  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required
Subscription required - Subscription is required.

2018 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Initial CapEx $M USD  ......  Subscription required
Sustaining CapEx $M USD  ......  Subscription required
Closure costs $M USD  ......  Subscription required
Total CapEx $M USD  ......  Subscription required
OP OpEx $M USD  ......  Subscription required
G&A costs $M USD 586.2
Total OpEx $M USD  ......  Subscription required
Income Taxes $M USD  ......  Subscription required
Gross revenue (LOM) $M USD  ......  Subscription required
Net Income (LOM) $M USD  ......  Subscription required
Pre-tax Cash Flow (LOM) $M USD  ......  Subscription required
After-tax Cash Flow (LOM) $M USD  ......  Subscription required
Pre-tax NPV @ 0% $M USD  ......  Subscription required
Pre-tax NPV @ 5% $M USD  ......  Subscription required
Pre-tax NPV @ 10% $M USD  ......  Subscription required
Pre-tax NPV @ 8% $M USD  ......  Subscription required
After-tax NPV @ 0% $M USD  ......  Subscription required
After-tax NPV @ 5% $M USD  ......  Subscription required
After-tax NPV @ 10% $M USD  ......  Subscription required
After-tax NPV @ 8% $M USD  ......  Subscription required
Pre-tax IRR, %  ......  Subscription required
After-tax IRR, %  ......  Subscription required
Pre-tax payback period, years  ......  Subscription required
After-tax payback period, years  ......  Subscription required
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Proposed Heavy Mobile Equipment as of January 1, 2018:
HME TypeSizeQuantity
Dozer (crawler) ....................... Subscription required
....................... Subscription required ....................... Subscription required
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....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jul 11, 2022
....................... Subscription required ....................... Subscription required Subscription required Jul 11, 2022
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Press Release 2018
Technical Report 2018
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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