Sierra Madre Commences Test Mining and Processing at Guitarra and Announces Accelerated Timeline to Commercial Production

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Vancouver, British Columbia--(Newsfile Corp. - July 23, 2024) - Sierra Madre Gold and Silver Ltd. (TSXV: SM) (OTCQX: SMDRF) ("Sierra Madre" or the "Company") is pleased to announce the commencement of test mining and processing at the Guitarra Mine Complex in Estado de Mexico, Mexico. The flotation plant has processed 5,698 dry tonnes (5,943 wet tonnes) of mineralized material from the Guitarra mine and is currently averaging 259 dry tonnes per day (tpd). This marks a significant milestone for the Company in the path to returning Guitarra to full commercial production of 500 tpd, which is now projected to commence in Q4 2024.

Greg Liller, Executive Chairman and COO of Sierra Madre, states, "Since acquiring Guitarra on March 30, 2023, our team has been working hard to get the mine back into commercial production. The commencement of test mining and processing is a significant step in that direction. I wish to thank Fransisco Correa, General Manager of Guitarra, Luis Saenz, Managing Director of Mexican Operations, and the Guitarra team for their outstanding work in getting us to this milestone event. The flotation plant has been in continuous 24-hour-a-day operation since the 25th of June, demonstrating the value and quality of work the Plant Operating Team did during the refurbishment program. The Mine Department began stockpiling development material on June 20th using the underground equipment our Maintenance Department rebuilt augmented by newly purchased equipment. The contributions of everyone on the Guitarra team to this milestone event have been invaluable and are deeply appreciated."

Opening day ceremonies were recently attended by the Presidents of the Municipio of Temascaltepec de Gonzales and San Simon de Gurrero, representatives of the Estado de Mexico government, elected leaders of the local communities and the Company's Board of Directors.

The Company currently has four operating Scoop trams, one low-profile haul truck and a Jumbo drill which were rebuilt by the Maintenance Department. In addition, the Company has purchased an 18-tonne dump truck for surface and underground haulage and a Stopemate long-hole drilling machine. The current test mining is using long hole and shrinkage mining techniques, with cut-and-fill operations planned to begin shortly. The current mine equipment availability is running at 88%, a clear indication of the quality and progress of the work that went into rebuilding the mining fleet.

The flotation plant has three ball mills:

  • a 5' x 8' mill, with a capacity of 84 tonnes per day (tpd);

  • an 8' x '6 mill, with a capacity of 204 tpd;

  • a 7' x 10' mill, with a capacity of 228 tpd.