Join us for a special open house at the Assay Office Museum, a surviving structure from the heyday of hard rock mining in the Colorado mountains. Discover how miners once tested ore for valuable metals using assaying. Explore original tools and historical artifacts and hear stories from the mining boom era. Learn about the families who lived and worked in this rugged landscape and helped shape the region's rich mining heritage. This is a must-visit for anyone passionate about mining history, geology, or Colorado history. No registration needed.