The greatest loss of life in hard rock mining history occurred in Butte on June 8, 1917, when 168 men died in the tragic Granite Mountain - Speculator Fire Disaster. The Granite Mountain Memorial offers the visitor an unforgettable panoramic view of the 10,000-foot Highland Mountains , the Continental Divide, and the remnants of a once booming mining industry. Interpretive plaques tell the story of the people, events, and turbulent times that surrounded this catastrophic episode.