Sierra Madre Gold and Silver Ltd. has filed a technical report, prepared in accordance with the National Instrument 43-101 - Standards of Disclosure for Mineral Projects ("NI 43-101") for its La Guitarra silver-gold mine and the Temascaltepec mining district ("La Guitarra") in Estado de Mexico, Mexico. Sierra Madre previously released the results of the Mineral Resource Estimate (the "MRE") on November 1, 2023. Key Highlights of the MRE include: 373% increase to 27.2M oz Silver Equivalent ("AgEq") Indicated Resource.

204% increase to 20.2M oz AgEq Inferred Resource. The following tabulates the La Guitarra estimated Mineral Resources.