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 ........

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 ........

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