Sierra Madre says La Guitarra processing plant throughput rises to 720 tonnes per day after Phase 1 expansion

• Sierra Madre reported Phase 1 upgrades lifted Guitarra processing plant throughput to 720 tonnes per day from 500 tonnes per day.
• Commissioning of a new 11x12 ball mill is expected in November 2026, targeting Phase 2 milling capacity of 1,200-1,500 tonnes per day.
• Underground development accelerated across Guitarra, Nazareno, Coloso; 2.6 km of development completed since June 2026 to supply plant feed.
• Work started on a permitted dry-stack tailings expansion; initial build-out capacity set at 877,000 tonnes within a permitted area exceeding 5 million tonnes.

Disclaimer: This news brief was created by Public Technologies (PUBT) using generative artificial intelligence. While PUBT strives to provide accurate and timely information, this AI-generated content is for informational purposes only and should not be interpreted as financial, investment, or legal advice. Sierra Madre Gold and Silver Ltd. published the original content used to generate this news brief via Newsfile (Ref. ID: 202609281700NEWSFILECNPR____20260928_316366_1) on September 28, 2026, and is solely responsible for the information contained therein.