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Mexico
San Agustin Mine (El Castillo Complex)

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 Location:
84 km N from Durango, Durango, Mexico
  Address:
Carr. San Juan Coneto de Comonfort Km. 12
San Juan del Río
Durango, Mexico
34480
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News
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Overview

StatusTemporary Suspension
Mine TypeOpen Pit
Commodities
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
Production Start...
Mine Life2024
San Agustin Mine historically processed 30,000 t/d of crushed and belt agglomerated ore stacked onto a conventional single use leach pad. Starting in 2023, process plans will decrease to 20,000 t/d.

Mining activities have been temporarily suspended in the San Agustin Mine by Q4 2023.

Land access and permitting issues at San Agustin have restricted mining operations, timing of approvals is uncertain.

Owners

Source: p. 32
CompanyInterestOwnership
Argonaut Gold Inc. 100 % Indirect
Minera Real del Oro S.A. de C.V. (operator) 100 % Direct
The San Agustin mine is owned and operated by Minera Real del Oro, S.A. de C.V., which is a subsidiary of Argonaut Gold Inc.

Contractors

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Deposit Type

  • Epithermal
  • Vein / narrow vein
  • Porphyry

Summary:

Deposit Type
The San Agustin Project does not fit entirely into an epithermal classification. The San Agustin deposit appears genetically and spatially related to a quartz monzonite stock with intense phyllic alteration and local tourmaline breccias. These factors may point towards a telescoped system associated with a deeper porphyry centre. This is supported by broad zones of potassic alteration that are overlapped by pervasive phyllic alteration; however, locally on the surface and in some drill holes, boiling textures, suggestive of an epithermal system do occur. Mineralization is mainly associated with pyrite that fills fractures, is disseminated, and occurs in the matrix of hydrothermal breccias. These form an extensive system of sulphide stockworks and disseminated mineralization dominated by pyrite.

San Agustin is interpreted to be a porphyry-style gold system related to Eocene aged intrusions emplaced into Cretaceous clastic and carbonate sedimentary rocks in an extensional tectonic setting. Gold mineralization occurs throughout the magmatic-hydrothermal system in space and time and is spatially related to early potassic development and an overprint of phyllic alteration. Supergene alteration, formed as a product of acid leaching, resulted in argillic-quartz alteration assemblages within the oxide zone of the deposit. The main gold event is associated with magmatic hydrothermal fluids corresponding to phyllic alteration. The gold system was overprinte ........

Mining Methods

  • Truck & Shovel / Loader

Summary:

Temporarily pausing mining activities mine San Agustin by Q4 2023. San Agustin is a contract-operated mine and Owner-operated process facility using conventional equipment and conventional mining methods. The San Agustin mine is a relatively low-grade gold deposit that benefits from a low strip ratio and disseminated mineralization that is amenable to bulk mining activities and good heap leach recoveries. Situated in a semi-arid environment surrounded by moderate topography, the oxide material that hosts the mineralization is relatively shallow with no major impediments to mining. There are seven mine phases remaining in the LOM plan and the final pit dimensions are approximately 1.6 km long (east-west) by 1.1 km wide (north-south) and up to 140 m deep. The final pit contains approximately 36.6 Mt of ore and 28.7 Mt of waste for an overall strip ratio of 0.78 (waste:ore) including mining dilution and ore losses applied in the mine schedule. Production is expected to be limited to 11 Mt/year for ore over the course of the mine life. As a result, it is expected that 344 koz of gold will be placed on the heap leach pad from August 2021 through the end of 2024 for a remaining mine life of 3.5 years. The mining method consists of traditional drill-and-blast operations followed by excavator loading of rigid-body haul trucks (100 t class) for ore transport to the crusher and waste transportation to designated WRSF locations. Approximately 16.7 Mm3 of waste storage space was def ........

Crushing and Grinding
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Processing

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Summary:

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Production:

CommodityUnits202220212020201920182017
Gold oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required65,32310,302
Silver oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Equivalent oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in doré.
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Operational Metrics:

Metrics202220212020201920182017
Daily processing capacity  ......  Subscription required  ......  Subscription required30,000 t
Stripping / waste ratio  ......  Subscription required  ......  Subscription required0.67 0.73 0.44 0.43
Ore tonnes mined  ......  Subscription required  ......  Subscription required9,261 kt8,453 kt7,379 kt939 kt
Waste  ......  Subscription required  ......  Subscription required6,171 kt6,166 kt3,216 kt404 kt
Total tonnes mined  ......  Subscription required  ......  Subscription required15,432 kt14,619 kt10,595 kt1,343 kt
Tonnes processed  ......  Subscription required  ......  Subscription required9,428 kt8,291 kt7,408 kt1,004 kt
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Reserves at December 31, 2022:
Cut-off grades for reserves are 0.17 g/t AuEQ.

CategoryTonnage CommodityGradeContained Metal
Probable 14 Mt Gold 0.32 g/t 145 koz
Probable 14 Mt Silver 14.9 g/t 6,690 koz
Indicated 22.1 Mt Gold 0.31 g/t 223 koz
Indicated 22.1 Mt Silver 12.8 g/t 9,092 koz
Inferred 21.9 Mt Gold 0.61 g/t 427 koz
Inferred 21.9 Mt Silver 21.3 g/t 15,015 koz

Commodity Production Costs:

CommodityUnits202220212020201920182017
Cash costs (sold) Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 545 / oz†   385 / oz†  
All-in sustaining costs (sold) Gold USD  ......  Subscription required
† Net of By-Product.
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Operating Costs:

Units2022
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 milled) USD  ......  Subscription required
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Financials:

Units202220212020201920182017
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 7.5   27.8  
Sustaining costs M USD  ......  Subscription required
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Water Supply
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Heavy Mobile Equipment as of August 1, 2021:
HME TypeModelQuantityLeased or
Contractor
Dozer (crawler) ....................... Subscription required ....................... Subscription required Leased
Drill (blasthole) ....................... Subscription required ....................... Subscription required Leased
Excavator ....................... Subscription required ....................... Subscription required Leased
Grader ....................... Subscription required ....................... Subscription required Leased
Loader (FEL) ....................... Subscription required ....................... Subscription required Leased
Truck (dump) ....................... Subscription required ....................... Subscription required Leased
Truck (dump) ....................... Subscription required ....................... Subscription required Leased
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Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required May 23, 2023
....................... Subscription required ....................... Subscription required Subscription required May 23, 2023
....................... Subscription required ....................... Subscription required Subscription required Apr 5, 2023
....................... Subscription required ....................... Subscription required Subscription required Apr 5, 2023
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Staff:

EmployeesYear
Subscription required 2021
Subscription required 2020

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2023
Annual Information Form 2022
Corporate Presentation 2022
Financial Review 2022
Management Discussion & Analysis 2022
Year-end Mineral Reserves 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
Annual Information Form 2018
Financial Review 2018
Management Discussion & Analysis 2018
Technical Report 2018
Annual Information Form 2017
Management Discussion & Analysis 2017
Press Release 2017
Preliminary Economic Assessment 2016
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