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Mexico
San Antonio Project

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 Location:
38 km SE from La Paz, Baja California, Mexico

  Project Contacts:
9600 Prototype Court
Reno
Nevada, United States
89521
Phone  ...  Subscription required
Fax(775) 284 4426
EmailEmail
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
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  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StatusInactive / Suspended
Mine TypeOpen Pit
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
Mine Life15 years (as of Jan 1, 2012)
The San Antonio Project contains four known gold deposits: (1) at Los Planes (North Zone); (2) Intermediate (between Los Planes and Las Colinas); (3) Las Colinas; and (4) La Colpa.

The Argonaut has not been able to successfully permit the San Antonio Project and it is unknown if or when it will receive the permits required to construct and operate. At this time, there is no activity at the San Antonio project site.


Owners

Source: p. 11
CompanyInterestOwnership
Argonaut Gold Inc. 100 % Indirect
The Argonaut owns 100% of the San Antonio Project as its foreign operations in Mexico.

December 5, 2022 - Heliostar Metals Limited is pleased to announce that it has entered into a binding option agreement (the "Option Agreement") with Argonaut and its wholly owned subsidiary, Compañía Minera Pitalla S.A. de CV ("Compañía Minera Pitalla"), pursuant to which it has been granted an option (the "Option") to acquire a 100% interest in the San Antonio Gold Project. Both projects are located in Mexico.

Contractors

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Deposit Type

  • Breccia pipe / Stockwork
  • Orogenic


Summary:

The mineralization has been identified over approximately 1.8 km of strike length at the Project and has been subdivided into four fault-bounded zones referred to as Los Planes, Intermediate, Las Colinas, and La Colpa, Los Planes is the best known of the areas and is the most densely drilled. Local normal and listric faulting displaces and truncates the mineralized zones (Herdrick, 2009). Much of the outcrop is covered by pediment that thickens to the east, featuring cobbles and boulders of schist and gneiss.

Los Planes
Mineralization extends along a north-south strike length of approximately 800 m. Drilling has encountered continuous mineralization to depths of 380 m from the surface. Mineralization generally varies between 1 and 20 m in thickness. Mineralization thickness is highly variable due to the stockwork-style of mineralization, and zones can locally coalesce into broader intervals over 100 m in thickness. Mineralization is interpreted to be open along strike to the north and at depth. Mineralization is hosted in diorites and gabbros within a large shear zone that dips between 75º and 45º to the west and horizontally to very shallowly to the east. The shear zone is broken into subunits that are defined by their structure, alteration, and degree of mineralization.

Las Colinas & Intermediate
Las Colinas and Intermediate zones appear to be genetically related, and are separated by postmineral normal faults that effectively truncate minera ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

The pits are designated as North or Los Planes, Intermediate and Las Colinas pits; the North Pit was designed with three phases. The resulting pit designs defined 60.2 Mt of Measured and Indicated resource with an average grade of 0.85 g/t Au and 0.5 Mt of Inferred resources averaging 0.84 g/t Au. The average strip ratio is 3.1:1. At a 4 MTPY production rate, it is expected the potential mine life to be in excess of 15 years. The production schedule targeted a consistent total mine tonnage of approximately 18 MTPY.

The final dimensions of the proposed open pits detail the potential size of the operation and are not limited by infrastructure restrictions. Potential restrictions may include additional required permitted space for future heap leach pads and partial relocation of the highway that connects the towns of San Antonio and San Juan de los Planes.

Dimensions of the North Pit are 1200m north-south and 800 m east-west. The Intermediate pit is 400m x 400m and it merges with the North Pit where both pits share the main ramp. The Colinas pit is located to the south of the Intermediate Pit and has a dimension of 650 m in the north-south direction and 400 m in the west-east direction.

Two primary waste dumps are located to store waste from the North, Intermediate and Las Colinas pits. The North waste dump is located 100 m west and north of the North Pit, and will contain the waste rock produced by the North pit and part of the Intermediate pit ........


Crushing and Grinding
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Processing

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Summary:

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Projected Production:

CommodityUnitsAvg. AnnualLOM
Gold koz 741,046

* According to 2012 study.

Reserves at December 31, 2020:
Cut-off grades are 0.11 g/t Au for oxide and transition and 0.15 g/t Au for sulphide ore.

0.

CategoryTonnage CommodityGradeContained Metal
Measured & Indicated 65 Mt Gold 0.86 g/t 1,735 koz
Inferred 6.2 Mt Gold 0.34 g/t 67 koz

Commodity Production Costs:

CommodityUnits2022
Cash costs Gold USD 553.06 / oz *  USD
Assumed price Gold USD 1,355 / oz *  USD
* According to 2012 study / presentation.
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Operating Costs:

Units2022
OP mining costs ($/t milled) USD 5.5 *
Processing costs ($/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 198.6
Refining costs $M USD  ......  Subscription required
G&A costs $M USD 46.2
Total OpEx $M USD  ......  Subscription required
Income Taxes $M USD  ......  Subscription required
Net revenue (LOM) $M USD  ......  Subscription required
Operating margin (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 @ 8% $M USD  ......  Subscription required
After-tax NPV @ 8% $M USD  ......  Subscription required
Pre-tax payback period, years  ......  Subscription required
Subscription required - Subscription is required.


Proposed Heavy Mobile Equipment as of October 10, 2012:
HME TypeModelSizeQuantityLeased or
Contractor
Crane 40 t Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required Leased
....................... Subscription required ....................... Subscription required Leased
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Oct 10, 2012
....................... Subscription required ....................... Subscription required Subscription required Oct 10, 2012
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2012

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
Annual Information Form 2018
Management Discussion & Analysis 2018
Annual Information Form 2017
Management Discussion & Analysis 2017
Annual Information Form 2015
Technical Report 2012
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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