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Mexico
Cerro de Oro Project

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 Location:
200 km NE from Zacatecas, Zacatecas, Mexico

  Project Contacts:
C. Pedro Moreno 24, El Centenario
Hermosillo
Sonora, Mexico
83000
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StagePreliminary Economic Assessment
Mine TypeOpen Pit
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
Mine Life8.2 years (as of Jan 1, 2022)
Permit Application submission for Cerro de Oro project expected late Q1 2023.


Owners

Source: p. 2
CompanyInterestOwnership
Minera Alamos Inc. 100 % Indirect
In September 2020, the Minera Alamos finalized definitive option agreements through its subsidiary Minera Mirlos S. De R.L. DE C.V. and an arm’s length parties to acquire 100% of the Cerro de Oro project comprising the Zacatecas I and Zacatecas II concessions near Concepcion del Oro, Zacatecas, Mexico. The agreements convey 100% ownership to the Company with no underlying royalties subject to the Company meeting a schedule of payments.

Contractors

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Deposit Type

  • Porphyry
  • Vein / narrow vein


Summary:

Mineralization at the Cerro de Oro deposit is typical of a porphyry system and is characterized by the development of A and B veins. These veins developed during an early potassic alteration phase and were later overprinted by silica and sericite (phyllic overprinting) within the inter-mineral porphyritic intrusive phases. These phases form part of the overall intrusive complex.

Mineralization at the Project scale occurs within a granodioritic porphyritic stock and within its calcareous host rocks. Within the calcareous host rock zone are blocks of highly garnetized limestone that are part of the Indidura Formation. These sedimentary rocks have been uplifted by the intrusion of the granodiorite stock.

The current Mineral Resources are contained within a semicircular zone of about 1 km diameter; within this mineralized envelope the ore zones are mixed, with some lower-grade or barren zones. Most of the drilling is shallow, with an average depth of 100 m, roughly corresponding to the depth of supergene oxidation. The upper 70 m to 120 m of the mineralization has been oxidized with pyrite altered to hematite, goethite, and jarosite. The hypogene sulphide mineralization is open at depth, and along all directions.

Mineralization at Cerro de Oro consists dominantly of pyrite that is widely disseminated throughout the porphyritic granodiorite, and in hornfels and skarns developed at the contact with the sedimentary rocks. Occasionally the presence of ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

The Cerro de Oro project is planned as a conventional open pit operation that will use haul trucks and front-end loaders. Material will be drilled and blasted, before being loaded and hauled to the waste dump, crusher, or direct to the heap leach pad. Mining activities will be completed by a contractor who will supply all the required mine equipment and personnel working under the supervision of the Company’s technical staff.

The Cerro de Oro project will be mined using primarily rigid frame 100-ton haul trucks and front-end loaders with a bucket capacity in the 11.5 m3 range. Mined materials from the open pits, depending on the classification (mineral or waste), will be hauled either to a waste dump, to the crusher or placed directly on a heap leach pad.

The Project will have one leach pad along the eastern project boundary with future expansion potential to the immediate west of the planned pad. There will be two waste dumps to the south of the open pits denoted waste dump #1 and waste dump #2.

The open pit designs include pit ramps sized to accommodate 100-t haul trucks that are likely to be used for the Project. The pit ramp will have a width of 25 m (3.5X the operating width of a 100-t truck), which is large enough to accommodate two-way traffic, a drainage ditch and safety berm at the road edge. The ramp width of the final six benches will be reduced to 15 m (single lane) to improve overall mineral recoveries related to mining in the bot ........


Crushing and Grinding
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Processing

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Summary:

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Projected Production:
Production is shown as loaded carbon concentrate to be shipped for final gold doré production and sale.

CommodityUnitsAvg. AnnualLOM
Gold oz 58,400476,610

Operational Metrics:

Metrics
Stripping / waste ratio  ......  Subscription required
Daily ore mining rate  ......  Subscription required
Waste tonnes, LOM  ......  Subscription required
Ore tonnes mined, LOM  ......  Subscription required
Total tonnes mined, LOM  ......  Subscription required
Daily processing rate  ......  Subscription required
Tonnes processed, LOM  ......  Subscription required
Annual processing capacity  ......  Subscription required
Annual ore mining rate  ......  Subscription required
* According to 2022 study.
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Reserves at :


Commodity Production Costs:

CommodityUnitsAverage
Cash costs (sold) Gold USD  ......  Subscription required&nbs
All-in sustaining costs (sold) Gold USD  ......  Subscription required *†
Pre-tax break-even price Gold USD  ......  Subscription required&nbs
Assumed price Gold USD  ......  Subscription required&nbs
* According to 2022 study / presentation.
† Net of By-Product.
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Operating Costs:

Units2022
OP mining costs ($/t mined) USD 2.23 *
OP mining costs ($/t milled) USD  ......  Subscription required
Crushing costs ($/t milled) USD  ......  Subscription required
Processing costs ($/t milled) USD  ......  Subscription required
G&A ($/t mined) USD  ......  Subscription required
G&A ($/t milled) USD  ......  Subscription required
Total operating costs ($/t mined) USD  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required
* According to 2022 study.
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2022 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 204.1
Refining costs $M USD  ......  Subscription required
Transportation (haulage) costs $M USD 17.8
G&A costs $M USD 19
Total OpEx $M USD  ......  Subscription required
Income Taxes $M USD  ......  Subscription required
Gross revenue (LOM) $M USD  ......  Subscription required
After-tax Cash Flow (LOM) $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
After-tax IRR, %  ......  Subscription required
After-tax payback period, years  ......  Subscription required
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Water Supply

The sources of process water available for the Cerro de Oro project consist of groundwater wells. In mid-2022 Corex Global (a subsidiary of Minera Alamos) hired a hydrogeological consulting group to perform reviews of the Cerro de Oro area to better understand the regional water flows around Melchor Ocampo.

Seven high-priority targets have been selected by the Company for test drilling down to a maximum depth of 300 m. Many of the target areas are located north of the planned leach pad/processing plant facilities and at a distance less than 5 km.


Proposed Heavy Mobile Equipment as of September 28, 2022:
HME TypeSizeQuantityLeased or
Contractor
Drill 171 mm ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Feb 17, 2023
....................... Subscription required ....................... Subscription required Subscription required Sep 28, 2022
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Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2023
Press Release 2023
Management Discussion & Analysis 2022
Preliminary Economic Assessment 2022
Press Release 2022
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