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Mexico
Pitarrilla Project

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 Location:
157 km N from Durango, Durango, Mexico
  Project Contacts:
Calle Cerro Gordo del Campestre No. 201, interior #208 Colonia Las Quintas
Leon
Guanajuato, Mexico
37125
Phone  ...  Subscription required
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News
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Overview

 Archived Information
Mine TypeOpen Pit
Commodities
  • Silver
  • Zinc
  • Lead
Mining Method
  • Truck & Shovel / Loader
Mine Life32 years (as of Jan 1, 2012)
Pitarrilla, one of the largest undeveloped silver projects in the world.

On January 17, 2022, Endeavour Silver Corp. acquired the Pitarrilla Project, located d in Durango State, Mexico, from SSR Mining Inc.

Currently, Endeavour Silver Corp classifies the Pitarrilla Project as an exploration project.

In 2023, at the Pitarrilla project, management plans to invest $3.1 million on maintenance of the office and camp, underground drilling and evaluation programs, and 500 metres of underground development. The largest portion of the expenditures at Pitarrilla in 2023 relates to development costs to continue advancing the 1 kilometre long decline and excavate lateral drifts that will be used to drill 5,000 metres to test the resource at various angles.

Please note that all data, besides Geology and Mineral Resources, presented below is sourced from 2012 technical report and should not be regarded as up-to-date.

Owners

Source: p. 1
CompanyInterestOwnership
Endeavour Silver Corp. 100 % Indirect
The Pitarrilla project is held by SSR Durango, S.A. de C.V.

On July 6, 2022, announced the successful completion of its acquisition of the Pitarrilla Project (“Pitarrilla”) from SSR Mining Inc. Endeavour purchased Pitarrilla by acquiring all the issued and outstanding shares of SSR Durango, S.A. de C.V. from SSR Mining and Silver Standard Ventures Inc. for total consideration of approximately $70 million.

Contractors

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Deposit Type

  • Vein / narrow vein
  • Epithermal

Summary:

The Property is located on the eastern flank of the Sierra Madre Occidental mountain range. This mountain range is the erosional remnant of one of the Earth’s most voluminous accumulations of intermediate to felsic volcanic rocks, which formed a calc-alkaline magmatic arc that was built during Eocene to early Miocene time, roughly 52 to 25 million years ago, in response to subduction of the Farallón tectonic plate beneath North America, this mountain building event is known as the Laramide Orogeny. A large number of medium to high-level hydrothermal systems variably enriched in Ag, Au, Pb, and Zn were intermittently generated during this extended period of volcanism, including the epithermal mineral systems that formed the great Mexican silver mining districts at Guanajuato, Real de Angeles in Zacatecas, Fresnillo, and Santa Barbara-San Francisco del Oro. The silver-lead-zinc mineralization found on the Pitarrilla property is situated in Central Mexican Silver Belt, a metallogenic province defined by the four previously noted silver mining districts along with the mining districts of Parral, Santa Maria del Oro, and SombrereteChalchihuites. The Pitarrilla Project Ag-Zn-Pb deposit is hosted by deformed Cretaceous marine sediments and unconformably overlying Eocene (52 to 40 Ma) and Oligocene (32 to 28 Ma) volcanics volcaniclastics and intrusives. Eocene volcanics and volcaniclastics were derived from arc volcanism and from the erosion of subaerial arc volcanoes and deposited ........

Mining Methods

  • Truck & Shovel / Loader

Summary:

The Pitarrilla Project will use standard truck and shovel open-pit mining methods. The expected mining life is 20 years, including three pre-production years. The pit will be mined in five phases, starting with Breccia Ridge and Cordon Colorado. Over the life of the Pitarrilla Project, a fleet of trucks is expected to haul approximately 1.1 billion tonnes of material and 157 million tonnes of ore, at a strip ratio of 5.96:1. After mining is completed, the plant will continue to mill ore from stockpiles for an additional 12 years.

The potential to mine Mineral Resources located below the open pit was not evaluated in the Pitarrilla Feasibility Study (M3, 2012), but may be evaluated later in the Pitarrilla Project’s life.

The Pitarrilla Feasibility Study (M3, 2012) calls for the mining of 157 Mt of silver ore and 933 Mt of waste via open cut mining methods from a single, large, semi-conical pit. The total waste tonnes include additional waste for potentially acid generating (“PAG”) neutralizing material to be sourced outside the main pit. The ore and some of the waste is planned to be mined on 7.5m high benches and where there are suitable areas without ore, these are planned to be mined on 15m high benches (47% of tonnage).

The prime earth moving fleet is planned to comprise of four 21 m3 shovels, two 19 m3 loaders, up to 28 x 150 tonne trucks and ten drill rigs. The fleet is planned to move 190 ktpd to 210 ktpd of total material during peak ........

Crushing and Grinding
Source: Subscription required

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Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.

Projected Production:

CommodityProductUnitsAvg. AnnualLOM
Silver Payable metal koz 10,102312,150
Zinc Payable metal M lbs  ......  Subscription required  ......  Subscription required
Zinc Concentrate kt  ......  Subscription required  ......  Subscription required
Lead Payable metal M lbs  ......  Subscription required  ......  Subscription required
Lead Concentrate kt  ......  Subscription required  ......  Subscription required

* According to 2012 study.

Reserves at October 6, 2022:
The pit optimization and in-pit base case cut-off grade of 50 g/t AgEq considers a mining cost of US$2.50/t rock and processing, treatment and refining, transportation and G&A cost of US$22.40/t mineralized material, an overall pit slope of 42° for oxide and 48° for transition and metal recoveries. The below-pit base case cutoff grade of 150 g/t AgEq considers a mining cost of US$46.50/t rock and processing, treatment and refining, transportation and G&A cost of US$30.90/t mineralized material.

CategoryOreTypeTonnage CommodityGradeContained Metal
Indicated In-Situ (OP) 133,864,000 t Silver 87.1 g/t 375,113,000 oz
Indicated In-Situ (UG) 24,783,000 t Silver 146.1 g/t 116,456,000 oz
Indicated Total 158,647,000 t Silver 96.4 g/t 491,569,000 oz
Indicated In-Situ (OP) 133,864,000 t Zinc 0.48 % 1,409 M lbs
Indicated In-Situ (UG) 24,783,000 t Zinc 2.14 % 1,172 M lbs
Indicated Total 158,647,000 t Zinc 0.74 % 2,580 M lbs
Indicated In-Situ (OP) 133,864,000 t Lead 0.19 % 547 M lbs
Indicated In-Situ (UG) 24,783,000 t Lead 1.01 % 551 M lbs
Indicated Total 158,647,000 t Lead 0.31 % 1,098 M lbs
Indicated In-Situ (OP) 133,864,000 t Silver Equivalent 112.3 g/t 483,234,000 oz
Indicated In-Situ (UG) 24,783,000 t Silver Equivalent 264.4 g/t 210,707,000 oz
Indicated Total 158,647,000 t Silver Equivalent 136 g/t 693,941,000 oz
Inferred In-Situ (OP) 25,643,000 t Silver 76.4 g/t 62,958,000 oz
Inferred In-Situ (UG) 9,808,000 t Silver 115.5 g/t 36,424,000 oz
Inferred Total 35,451,000 t Silver 87.2 g/t 99,382,000 oz
Inferred In-Situ (OP) 25,643,000 t Zinc 0.48 % 272 M lbs
Inferred In-Situ (UG) 9,808,000 t Zinc 1.8 % 389 M lbs
Inferred Total 35,451,000 t Zinc 0.85 % 661 M lbs
Inferred In-Situ (OP) 25,643,000 t Lead 0.14 % 80 M lbs
Inferred In-Situ (UG) 9,808,000 t Lead 0.93 % 202 M lbs
Inferred Total 35,451,000 t Lead 0.36 % 281 M lbs
Inferred In-Situ (OP) 25,643,000 t Silver Equivalent 100.2 g/t 82,650,000 oz
Inferred In-Situ (UG) 9,808,000 t Silver Equivalent 217.5 g/t 68,588,000 oz
Inferred Total 35,451,000 t Silver Equivalent 132.7 g/t 151,238,000 oz

Commodity Production Costs:

CommodityUnits
Credits (by-product) Silver USD -5.46 / oz *  USD
Site cash costs (produced) Silver USD 11.6 / oz *  USD
Cash costs Silver USD 10 / oz *†  USD
Total cash costs Silver USD 15.9 / oz *†  USD
Assumed price Lead USD 0.9 / lb *  USD
Assumed price Zinc USD 0.95 / lb *  USD
Assumed price Silver USD 25 / oz *  USD
* According to 2012 study / presentation.
† Net of By-Product.
Subscription required - Subscription is required.

Operating Costs:

Units2022
OP mining costs ($/t mined) USD 1.44 *  USD
OP mining costs ($/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
* According to 2012 study.
Subscription required - Subscription is required.

2012 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
Processing OpEx $M USD 2,420
G&A costs $M USD 282.1
Total OpEx $M USD  ......  Subscription required
Income Taxes $M USD  ......  Subscription required
Net 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 @ 5% $M USD  ......  Subscription required
After-tax NPV @ 5% $M USD  ......  Subscription required
Pre-tax IRR, %  ......  Subscription required
After-tax IRR, %  ......  Subscription required
After-tax payback period, years  ......  Subscription required
Subscription required - Subscription is required.

Proposed Heavy Mobile Equipment as of December 14, 2012:
HME TypeModelSizeQuantity
ANFO Loader ....................... Subscription required
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Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Aug 7, 2023
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2012

Corporate Filings & Presentations:

DocumentYear
Management Discussion & Analysis 2022
Press Release 2022
Technical Report 2022
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
Corporate Presentation 2018
Annual Information Form 2017
Corporate Presentation 2017
Feasibility Study Report 2012
Subscription required - Subscription is required.

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