Casa Grande was built in 1854. There were thoughts of establishing it as a hotel, but this never happened. It was instead used as a residence for the mine, general manager. Often guests would stay there as well. The basement was used as a bank. Consequently there are bars on the windows, and a vault. In touring the building, it was decorated for Christmas. The home supported the mining of mercury nearby. This mine predated the gold rush, being established in the late 1840s. This mine was worked for a longer period of time, and provided more wealth than any other mine in California. Quick silver or mercury was important as at the time it was used for the extraction of gold and silver from their ore.