The Mining Museum is located in Casa Grande. The mining f mercury was very interesting. Mining the ore was not dangerous. The mercury is in a solid state and poses no threat. however in the process of mercury it had to be evaporated, and the gas collected. this did pose a risk, so the workers could only work one day per month in the processing of the ore. They gave me a large rock of cinnebar to heft and it was very heavy for its size.