 La Case Grande, an 1854 revival-style mansion designed and built by architect Francis Meyers, was the official residence and office of the mine superintendents, as well as a country retreat for wealthy mine investors.The mansion now serves as the site of the New Almaden Quicksilver Mining Museum, which contains exhibits about the history of mercury mining and the cultural history of the mining communities at New Almaden.The exhibits include a mine diorama of the interior of a mine shaft, mining equipment and technology, a mine manager's office with period displays, and artifacts from Cornish, Mexican and Chinese mining families.