Mexico

La Yaqui Grande Mine

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Categories

Overview

Mine TypeOpen Pit
Commodities
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
Production Start... Lock
Mine Life2027
ShapshotLa Yaqui Grande open pit is a part of the Mulatos Operation.

La Yaqui Grande mine achieved initial production in June 2022.
Related AssetMulatos Operation

Owners

SourceSource
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

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, generally within 2 km of the paleo-surface.

Residual vuggy quartz with gold is common at La Yaqui Grande deposit and zones outward to quartz-dickite ±alunite, quartz-kaolinite, and illite-smectite±chlorite. Coarse alunite is present on fractures in ore zones, and patchy quartz-alunite is found locally at depth (patchy alunite is considered an indication of the epithermal-porphyry transition, cf., Gustafson et al., 2004), pyrophyllite is absent. Advanced argillic quartz-dickite-alunite alteration provides significant gold resource at La Yaqui Grande.

La Yaqui Grande (LYG) is a new discovery 9 km southwest of the Mulatos Mine. LYG is a high- sulfidation epithermal Au-Ag deposit situated on the northern end of the Mexican Au-Ag belt along the southern arm of the Laramide porphyry belt in the Sierra Madre Occidental volcanic province.

Volcanic rocks at LYG are subdivided into compositionally, texturally, and temporally distinct rock units that crop out across the Mulatos mining district. The Lower Mulatos Andesite represents the oldest rocks (~75-62 Ma) and consists of fine-grained andesitic lavas and pyroclastic rocks interbedded with epiclastic rocks. Upper Mulatos Dacite (~61-58 Ma) overlies Mulatos Andesite and consists of porphyritic andesite and dacitic flow-domes with related pyroclastic rocks that host the gold ore. Massive silica lies atop mineralized Mulatos Dacite and consists of stratified polymictic and silicified breccia containing massive and vuggy silica fragments. Mulatos Dacite and massive silica are intruded by Yaqui dacite porphyry (60.82±0.76 Ma), followed by emplacement of the Yaqui granodiorite (58.0±0.6 Ma). The rhyodacitic Estrella Tuff (55.01±0.13 Ma) overlies upper Mulatos Dacite and represents the final explosive Laramide eruption at Mulatos. Yaqui dacite porphyries display hydrothermal quartz alunite-dickite alteration, whereas Estrella Tuff and Yaqui granodiorite are unaltered to weakly altered with illite-chlorite-smectite. Post-Laramide late Eocene to Oligocene rhyolitic ash-flow tuffs of the Nopal Rhyolite (~36-32 Ma) overlie the Estrella Tuff with unconformity and a hiatus of ~20 million years. These rocks represent the onset of the middle Cenozoic caldera-forming ignimbrite flare up and are unaltered at LYG.

Extensional tectonics (28-16 Ma) post-date Mulatos ore and the caldera eruptions, juxtapose the stratigraphy and rotated bedding (20° to 35° ENE) exposing advanced argillic alteration below barren massive silica. Basins were filled with post-mineral Oligo-Miocene deposits of basaltic-andesite lavas (28-25 Ma) interbedded with rhyolitic tuff and well-bedded conglomerates. Basaltic-andesite dikes crosscut the advanced argillic alteration.

Reserves

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Mining Methods

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Comminution

Crushers and Mills

Milling equipment has not been reported.

Summary:

Primary Crusher
Run-of-mine ore (ROM) is trucked from the mine by 100 tonne haul trucks to the crushing plant. The mine trucks normally direct dump onto a stationary grizzly located over the dump pocket. Alternatively, ROM ore may be trucked to a stockpile ahead of the primary crusher and later reclaimed using a front-end loader.

An apron feeder draws ore from the dump pocket at a controlled rate and dumps into a vibrating grizzly feeder with the feeder oversize reporting to the jaw crusher. The grizzly feeder undersize material bypasses the primary crusher and combines with the crusher product on conveyor belt No. 1 (CV-001), which discharges onto conveyor belt, No. 2 (CV-002).

Conveyor belt No. 2 discharges onto a coarse ore stockpile, with a 20,000 total tonne capacity.

A mobile hydraulic rock breaker is provided to break oversize ROM material.

A self-cleaning electric magnet is installed at the conveyor belt No. 1 transfer point to remove tramp metal.

A belt scale is installed on conveyor belt No. 2.

Water sprays are installed to suppress dust in ore feed streams, transfer points, dump pocket, and feeding the jaw crusher.

The crushing facility is equipped with an air compressor and air receiver for equipment maintenance and instruments.

Fine Crushing and Agglomeration
Ore is reclaimed using two variable speed belt feeders, which discharge onto conveyor belt No. 3 (CV-003).

Conveyor No. 3 discharges onto conveyor Belt No. 4 (CV-004), which discharges onto a double deck, vibrating, inclined screen. The undersize fraction from the screen bypasses the secondary and tertiary crushing circuit and reports to conveyor belt No. 10 (CV-010), and then onto conveyor belt No. 13 (CV-013). Oversize material from both decks is dumped directly into the secondary cone crusher.

Secondary crushed ore product is conveyed via conveyor belt No. 5 (CV-005), and conveyor belt No. 7 (CV-007) to a double cone tertiary feed bin. Two variable speed belt conveyors discharge ore onto the double deck tertiary screens.

The undersize fraction from the tertiary screens reports to conveyor belts No. 11 and No. 12 (CV011/012) respectively, which discharge onto conveyor belt No. 13 (CV-013). Screen oversize reports to the two tertiary crushers. The tertiary crushed ore is conveyed back to the tertiary crushing circuit for re-classification via conveyor belt No. 5. The product of the fine crushing circuit, at approximately 80 percent passing 9.5 mm, is conveyed to the agglomeration circuit for the binding process.

Cement and lime are added to the ore on conveyor belt No. 14 (CV-014), which is discharged into a pug mill mixer. The pug mill discharges onto conveyor belt No. 15 (CV-015), which feeds the drum agglomerator. Barren solution is added in the drum to reach the desired moisture for agglomeration. Agglomerated ore is discharged onto conveyor belt No. 16 (CV-016). A series of grasshopper conveyors and a stacker place the ore on the heap leach pads.

A metal detector is installed over conveyor belt No. 3 (CV-003) to manually remove any scrap metal.

Two lime silos and two cement silos are utilized.

A belt scale is installed on conveyor belt No. 13 and provides a signal for adjusting lime, cement addition and water addition to ensure set moisture for agglomeration. A belt sampler is also installed on conveyor belt No. 13.

Water sprays are utilized for dust suppression at the fine crushing circuit.

Processing

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Production

Production numbers have been reported since June 2022 when La Yaqui Grande achieved its initial production.
CommodityUnits20232022
Gold oz 00000000000
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.

Operational metrics

Metrics20232022
Ore tonnes mined 00000000000000
Waste 0000000000000000
Total tonnes mined 0000000000000000
Tonnes processed 00000000000000
Daily processing rate 0000
Daily processing capacity 00000
^ Guidance / Forecast.

Production Costs

CommodityUnits2022
Total cash costs (sold) Gold USD 0000000
Net of By-Product.

Heavy Mobile Equipment

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Personnel

Mine Management

Source Source
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 May 4, 2023

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