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Mexico
Santa Gertrudis Project

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 Location:
45 km SW from Cananea, Sonora, Mexico

  Project Contacts:
Suite 1301, 2000 Barrington Street
Halifax
Nova Scotia, Canada
B3J 3K1
Phone  ...  Subscription required
Fax902-442-1898
WebsiteWeb
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Overview

StagePreliminary Economic Assessment
Mine TypeOpen Pit
Commodities
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
Processing
  • Heap leach
  • Agitated tank (VAT) leaching
  • Carbon in column (CIC)
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
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.


Owners

Source: p. 17
CompanyInterestOwnership
Agnico Eagle Mines Ltd. 100 % Indirect
On November 1, 2017, Agnico Eagle Mines Ltd. acquired 100% of the issued and outstanding shares of Animas Resources Ltd., a wholly-owned Canadian subsidiary of GoGold Resources Inc. by way of a subscription and share purchase agreement (the ‘‘Animas Agreement’’) dated September 5, 2017. On the closing of the transactions relating to the Animas Agreement, Animas owned a 100% interest in the Santa Gertrudis exploration project located in Sonora, Mexico, indirectly, through three wholly-owned Mexican subsidiaries Recursos Escondidos, S.A. de C.V., First Silver Reserve, S.A. de C.V. and Coanzamex Santa Gertrudis, S.A. de C.V.

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 jasperoid replacement is present throughout the district on a small and large scale. This pattern of intersection of faults in preferred host rocks is repeated throughout the district and has been the model used to explore the district since the early Phelps Dodge days. Based on this apparent fact, any larger deposits to be found at depth or under alluvial cover probably will likewise be associated with favourable structural intersections and chemically reactive calcareous host rocks.

Gold mineralization within the Santa Teresa mining district is most common in areas of structural ground preparation and less so as replacement deposits in calcareous units. Favourable ground preparation produced by a combination of high-angle, bedding-plane, and near bedding-plane faults and fractures resulted in the formation of zones that can have considerable lateral and presumed down-dip extent. This type of mineralization is most characteristic at El Toro, El Corral, Mirador, Escondida, Becerros Norte, Manueles Sur, Maribel, and Camello. Mineralized zones are generally 10 to 30 metres thick, and locally extend outward to a limited extent as replacement of the calcareous units. The most favourable structural settings for gold mineralization clearly are where north-east and north-west-trending fault zones intersect.


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
Flow Sheet: Source


Processing

  • Heap leach
  • Agitated tank (VAT) leaching
  • Carbon in column (CIC)
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

The process design is based on the use of conventional heap leach technology with a process rate of 2.7 million t/a or 7,500 t/d.

Potential heap leach feed will be crushed in two stages and conveyed by a series of conveyors and a radial stacker capable of accessing the entire pad area. This material will be stacked in 6 m or 8 m high lifts and irrigated with dilute cyanide solution.

Pregnant solution will discharge the heap under gravity via embedded drainage piping and the contained gold will be adsorbed onto activated carbon in a five stage carbon-in-column (CIC) circuit. Gold will be eluted from the carbon periodically in a conventional batch pressure elution process, then electrowon and smelted to produce doré on site. Pregnant and barren solution ponds will provide surge for the process solutions and an emergency pond capable of holding anticipated maximum storm event water plus drawdown from the heap in the unlikely event of a concurrent temporary loss of po ........

Recoveries & Grades:

CommodityParameterAvg. LOM
Gold Recovery Rate, % 73.2
Gold Head Grade, g/t 0.97

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, 2020:

CategoryOreTypeTonnage CommodityGradeContained Metal
Measured & Indicated In-Situ (OP) 5,778 kt Gold 0.6 g/t 111 koz
Measured & Indicated Total 5,778 kt Gold 0.6 g/t 111 koz
Measured & Indicated In-Situ (OP) 5,778 kt Silver 4.39 g/t 816 koz
Measured & Indicated Total 5,778 kt Silver 4.39 g/t 816 koz
Inferred In-Situ (OP) 19,691 kt Gold 1.18 g/t 746 koz
Inferred In-Situ (UG) 7,980 kt Gold 3.43 g/t 879 koz
Inferred Total 27,671 kt Gold 1.83 g/t 1,625 koz
Inferred In-Situ (OP) 19,691 kt Silver 1.9 g/t 1,200 koz
Inferred In-Situ (UG) 7,980 kt Silver 25.39 g/t 6,515 koz
Inferred Total 27,671 kt Silver 8.67 g/t 7,715 koz

Commodity Production Costs:

CommodityUnitsAverage
Cash costs Gold USD 622 / oz *
Total cash costs Gold USD 629 / oz *
All-in sustaining costs (AISC) Gold USD 699 / oz *
Assumed price Gold USD 1,250 / oz *
* According to 2014 study / presentation.

Operating Costs:

Units2014
OP mining costs ($/t mined) USD 1.54 *
OP mining costs ($/t milled) USD  ......  Subscription required
Processing costs ($/t milled) USD  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required
* According to 2014 study.
Subscription required - Subscription is required.

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 TitleNameRef. Date
....................... Subscription required ....................... Subscription required Feb 1, 2021
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Corporate Filings & Presentations:

DocumentYear
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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