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Mexico
Mulatos Operation (La Yaqui Grande Mine, Mulatos Mine)

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 Location:
172 km NE from Ciudad Obregon, Sonora, Mexico

  Address:
Calle de Los Pimas 81, Parque industrial
Hermosillo
Sonora, Mexico
83299
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
Production Start...
Mine Life5 years (as of Jan 1, 2022)
Mining operations at the Mulatos Mine consist of the Mulatos open pit complex and the Yaqui Grande open pit and heap leach facility.

Puerto Del Aire (“PDA”) is a new higher-grade underground deposit located adjacent to the main Mulatos pit. A new development plan for PDA is expected to be completed in the second half of 2023 which will incorporate recent exploration success including a 71% increase in combined Mineral Reserves and Resources to one million ounces at the end of 2022.


Owners

Source: p. 12,46
CompanyInterestOwnership
Alamos Gold Inc. 100 % Indirect
Minas de Oro Nacional S.A. de C.V. (operator) 100 % Direct
The Mulatos group of concessions covers the Mulatos deposit and satellite gold systems known as Cerro Pelon, La Yaqui, El Carricito, El Halcon, Las Carboneras, El Jaspe, Puebla, Los Bajios, and La Dura. Mineral rights for all concessions comprising the Mulatos Group of Concessions are controlled by Minas de Oro Nacional, the Mexican subsidiary of Alamos.

Contractors

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Deposit Type

  • Epithermal
  • Breccia pipe / Stockwork


Summary:

The Mulatos mineral deposits are large epithermal, high-sulfidation, disseminated gold deposits. Gold mineralization is closely associated with silicic alteration within extensive areas of argillic and advanced argillic alteration. The Mulatos deposit proper is composed of the contiguous Estrella, El Salto, Mina Vieja, and Puerto del Aire Mineral Resource areas. The Escondida deposit is the faulted extension of the Mina Vieja and El Salto sub-deposits and is believed to be continuous to the northeast with the Gap, El Victor, and San Carlos mineralized areas. Although zones are often bounded by post-mineral faults, together they form a trend of 2.7 km of gold mineralization starting at the north end of the Estrella pit to the San Carlos deposit. Within the larger Mulatos Group of Concessions, and generally within 20 km from the Mulatos deposit, geologically similar high sulfidation gold deposits, occurrences, or prospects are known. Gold deposits of the Mulatos district are considered to be high sulphidation-state epithermal systems. Epithermal precious metal systems may be classified as high, intermediate, and low sulphidation styles. They are characterized by the sulphidation state of the hypogene sulphide mineral assemblage, and show general relations in volcano-tectonic setting, precious and base metal content, igneous rock association, proximal hypogene alteration, and sulphide abundance. Ore in all occurrences is of the type formed under epizonal conditions, that is, g ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

The mining at Mulatos is currently by open pit mining with the addition of underground operations likely to start within three years time. Open pit mining commenced at Mulatos in 2005 and has continued un-interrupted within the main pit area. Alamos Gold has completed mining at the Victor, San Carlos, Yaqui Phase 1, and Cerro Pelon open pits.

Main Mulatos Pit
The open pit mining is a typical drill, blast, load haul operation with mining in the main pit being done with 9 meter bench heights. The open pit schedule calls for an average of 17,500 tonnes of ore per day. Open pit mining is carried out by a contractor under the direction of Mulatos staff. Waste is delivered to waste dumps south of the pit and ore is delivered to the crushing area where it is either direct dumped into the primary crusher or put on to a short term pad. The contractor currently operates with a fleet of three CAT 992 front end loaders, 14 CAT 777 haul trucks, three drills and various pieces of support equipment. El Salto, on the west side of the main pit, is the last in a series of pushbacks and is expected to be completed in Q3 of 2023 based on current Mineral Reserves.

La Yaqui Grande Pit
Pre-stripping of the La Yaqui Grande pit commenced in December of 2020. Ore mining started in January of 2022 with some ore being used to produce over liner for the heap leach pad and the remainder being stockpiled until commissioning of the crusher commenced in May 2022. In the fourt ........


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

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^ Guidance / Forecast.

Production:

CommodityUnits2023202220212020201920182017
Gold koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required176160
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
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Operational Metrics:

Metrics202320222021202020192018
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required5,641,346 t7,166,679 t8,527,983 t
Waste  ......  Subscription required  ......  Subscription required  ......  Subscription required9,534,900 t7,095,650 t6,037,427 t
Total tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required15,176,245 t14,262,329 t17,316,741 t
Tonnes processed  ......  Subscription required  ......  Subscription required  ......  Subscription required7,308,457 t7,289,811 t6,886,855 t
Daily processing rate  ......  Subscription required  ......  Subscription required  ......  Subscription required20,000 t20,000 t18,900 t
Stripping / waste ratio  ......  Subscription required  ......  Subscription required  ......  Subscription required0.68 0.73 0.71
^ Guidance / Forecast.
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Reserves at December 31, 2022:
Mineral Resources Cut-off grades are: Mulatos Main Open Pit - 0.5 g/t Au; La Yaqui Grande - 0.3 g/t Au; Carricito - 0.3 g/t Au, PDA Underground - 2.5 g/t Au.

Mineral Reserve cut-off grade for the Mulatos Pit, stockpile and the La Yaqui Pitt are determined as a net of process value of $0.10 per tonne for each model block. Cut-off grade for Puerto del Aire is 3.00g/t.

CategoryTonnage CommodityGradeContained Metal
Proven 3,825 kt Gold 2.32 g/t 285 koz
Probable 22,909 kt Gold 1.89 g/t 1,394 koz
Probable 16,263 kt Silver 17.97 g/t 9,396 koz
Proven & Probable 26,734 kt Gold 1.95 g/t 1,679 koz
Measured 1,054 kt Gold 1.79 g/t 61 koz
Indicated 9,248 kt Gold 1.49 g/t 442 koz
Indicated 1,506 kt Silver 10.95 g/t 530 koz
Measured & Indicated 10,302 kt Gold 1.52 g/t 502 koz
Inferred 1,774 kt Gold 1.27 g/t 72 koz
Inferred 175 kt Silver 7.94 g/t 45 koz

Commodity Production Costs:

CommodityUnits2023202220212020201920182017
Total cash costs (sold) Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 786 / oz†   775 / oz†  
All-in sustaining costs (sold) Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 855 / oz†   835 / oz†  
^ Guidance / Forecast.
† Net of By-Product.
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Financials:

Units2023202220212020201920182017
Capital expenditures (planned) M USD  ......  Subscription required
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 7.2   5.5  
Growth Capital M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 25.2   25.9  
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 35.3   31.4  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 223.3   201.4  
Operating Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 42.7   41.7  
Operating Cash Flow M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 71   64.3  
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Water Supply
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Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 26, 2023
....................... Subscription required ....................... Subscription required Subscription required Apr 26, 2023
....................... Subscription required ....................... Subscription required Subscription required Apr 26, 2023
....................... Subscription required ....................... Subscription required Subscription required Apr 26, 2023
....................... Subscription required ....................... Subscription required Subscription required Apr 26, 2023
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Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2021
Subscription required Subscription required Subscription required 2020
Subscription required Subscription required Subscription required 2019
Subscription required 2018
Subscription required 2017

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2023
Annual Information Form 2022
Corporate Presentation 2022
Management Discussion & Analysis 2022
Technical Report 2022
Year-end Mineral Reserves 2022
................................... 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 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Management Discussion & Analysis 2018
Press Release 2018
Sustainability Report 2018
Year-end Mineral Reserves 2018
Management Discussion & Analysis 2017
Sustainability Report 2017
Year-end Mineral Reserves 2017
Corporate Presentation 2016
Management Discussion & Analysis 2016
Press Release 2016
Press Release 2016
Year-end Mineral Reserves 2016
Management Discussion & Analysis 2015
Annual Information Form 2014
Management Discussion & Analysis 2013
Management Discussion & Analysis 2012
Technical Report 2012
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