Vancouver, British Columbia--(Newsfile Corp. - September 30, 2025) - Sierra Madre Gold and Silver Ltd. (TSXV: SM) (OTCQX: SMDRF) ("Sierra Madre" or the "Company") is pleased to announce that underground development has started at the Nazareno silver and gold mine within the La Guitarra silver-gold complex in Estado de Mexico, Mexico. To date, over 700 tonnes of mineralized material have been delivered to the Guitarra processing plant from Nazareno. This material was not included in the Mineral Resource Est ...