Sierra Madre Announces Guitarra Processing Plant Achieves Throughputs of up to 720 Tonnes per Day as Development at Nazareno and Guitarra Mines Accelerates

Vancouver, British Columbia--(. - September 28, 2026) - Sierra Madre Gold and Silver Ltd. TSXV:SM (OTCQX: SMDRF) ("Sierra Madre" or the "Company") is pleased to provide an operational update on activities at its Guitarra silver-gold mine complex in Estado de Mexico, Mexico.Throughput a…