Sierra Madre Starts US$3.5 Million Exploration Program at the East District of Guitarra Project October 23, 2025 / Gambusino Prospector 2025-10-23 Sierra Madre Gold and Silver, Exploration. sierramadrego10232025-nrDownload Share this: Share on X (Opens in new window) X Share on Facebook (Opens in new window) Facebook Like this:Like Loading…