Sahuarita, AZ
The Mineral Discovery Center in Sahuarita, AZ offers a tour of one of the country’s largest open‑pit copper mines. Visitors can view displays that explain how copper deposits form, how ore is extracted and processed, and see historic mining equipment. The exhibit also details the mine’s scale—about two miles across and a quarter‑mile deep—and the ratio of ore to waste rock that must be removed to maintain economic viability.