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Mexico
Santa Gertrudis Project

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 Location:
45 km SW from Cananea, Sonora, Mexico

  Project Contacts:
Ave. Mirador #7724 Colinas del Valle
Chihuahua
Chihuahua, Mexico
31217
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WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StagePreliminary Economic Assessment
Mine TypeOpen Pit
Commodities
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
Mine Life12 years (as of Jan 1, 2014)
The Santa Gertrudis property was the site of an historic heap leach operation that produced approximately 565,000 ounces of gold at a grade of 2.1 g/t gold from 1991 to 2000. Substantial surface infrastructure is already in place on the property including pre-stripped pits, haul roads, water sources and buildings.

The Company is currently evaluating a potential production scenario at Santa Gertrudis that utilizes a heap leach for lower-grade mineralization and a small mill facility to process higher-grade ore. The Company believes that the Santa Gertrudis project has the potential to be a similar size operation to La India.


Owners

Source: p. 236
CompanyInterestOwnership
Agnico Eagle Mines Ltd. 100 % Indirect
In November 2017, the Agnico Eagle acquired its 100% interest in the Santa Gertrudis property.

Contractors

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Deposit Type

  • Carlin-type


Summary:

Historic production for the Santa Teresa mining district was principally from sedimentary-rockhosted gold deposits that have been characterized by some authorities as “Carlin-type” in character. As noted in Section 7.0, although there are several features similar to Carlin-type gold systems, there are also many differences.

Field mapping and rock-chip geochemical sampling by Animas personnel within the Santa Teresa mining district confirms the presence of gold mineralization along north east striking (~045°), steeply west-dipping, normal and oblique slip faults. Gold mineralization appears to occur primarily within the hanging wall portions of the fault zones and these faults are believed to be the primary “feeder” structures for the known gold mineralization. Where the northeast-trending faults intersect northwest-trending, reactivated, bedding parallel thrust faults (~345°) and deformation zones, gold mineralization tends to bleed out along these more permeable zones. Tensional, conjugate sets of north-south and east-west trending faults also control the localization of gold mineralization, but these zones generally are less well mineralized than the northeast- and northwest-trending set of faults.

Mineralization appears to occur preferentially in rocks that were both structurally prepared and had chemical properties that allowed for gold deposition. Calcareous siltstone and limestone in La Gloria, Greta, and Santiago show strong local dissolution and ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

The Santa Gertrudis property contains numerous gold deposits, some of which were partially mined in the past. The deposits are near surface and lend themselves to conventional open pit mining methods. The entire project area is about 10 km long in both the north-south and east-west directions.

For the PEA production plan, 27 different open pits will be developed over the life of the project to support a heap leaching operation. Some heap leach feed material will also be mined from a historical heap leach pad that retains recoverable gold.

Based on preliminary pit optimizations, and the application of dilution and losses factors, potential mine production and heap leach feed tonnages were estimated for each deposit. The total quantity of material that would be sent to the leach pad is calculated to be 29.5 Mt containing 916 k oz of gold. The overall waste to potential heap leach feed ratio is 5.5:1.


Crushing and Grinding
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Processing

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Summary:

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Projected Production:

CommodityUnitsAvg. AnnualLOM
Gold oz 56,000671,300
All production numbers are expressed as metal in doré.

Operational Metrics:

Metrics
Stripping / waste ratio 5.5 *
Daily ore mining rate 7,500 t *
Annual mining capacity 2,700 kt of ore *
Waste tonnes, LOM 163,187 kt *
Ore tonnes mined, LOM 29,511 kt *
Total tonnes mined, LOM 192,698 kt *
Daily processing rate 7,500 t *
Annual processing rate 2,700 kt *
* According to 2014 study.

Reserves at December 31, 2021:

CategoryOreTypeTonnage CommodityGradeContained Metal
Measured & Indicated In-Situ (OP) 4,826 kt Gold 0.64 g/t 99 koz
Measured & Indicated Total 4,826 kt Gold 0.64 g/t 99 koz
Measured & Indicated In-Situ (OP) 4,826 kt Silver 4.77 g/t 739 koz
Measured & Indicated Total 4,826 kt Silver 4.77 g/t 739 koz
Inferred In-Situ (OP) 23,494 kt Gold 1.14 g/t 858 koz
Inferred In-Situ (UG) 7,343 kt Gold 3.48 g/t 821 koz
Inferred Total 30,837 kt Gold 1.69 g/t 1,679 koz
Inferred In-Situ (OP) 23,494 kt Silver 2.12 g/t 1,600 koz
Inferred In-Situ (UG) 7,343 kt Silver 18.32 g/t 4,324 koz
Inferred Total 30,837 kt Silver 5.97 g/t 5,924 koz

2014 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Initial CapEx $M USD  ......  Subscription required
Sustaining CapEx $M USD  ......  Subscription required
Total CapEx $M USD  ......  Subscription required
OP OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 105
G&A costs $M USD 21
Total OpEx $M USD  ......  Subscription required
Total Taxes $M USD  ......  Subscription required
Gross revenue (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 @ 7% $M USD  ......  Subscription required
After-tax NPV @ 0% $M USD  ......  Subscription required
After-tax NPV @ 5% $M USD  ......  Subscription required
After-tax NPV @ 7% $M USD  ......  Subscription required
Pre-tax IRR, %  ......  Subscription required
After-tax IRR, %  ......  Subscription required
After-tax payback period, years  ......  Subscription required
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Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Aug 1, 2022
....................... Subscription required ....................... Subscription required Subscription required Aug 1, 2022
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Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
Annual Information Form 2018
Annual Information Form 2017
Annual Report 2017
Press Release 2017
Annual Information Form 2016
Corporate Presentation 2016
Management Discussion & Analysis 2016
Annual Information Form 2015
Preliminary Economic Assessment 2014
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