Empire Mine State Historic Park is the site of one of the oldest, deepest, and richest gold mines in California. The park is in Grass Valley at 10791 East Empire Street. In operation for more than 100 years, the mine extracted 5.8 million ounces of gold before it closed in 1956. The park contains many of the mine’s buildings, the owner’s home and restored gardens, as well as the entrance to 367 miles of abandoned and flooded mine shafts. The park encompasses 856 acres of forested backcountry and fourteen miles of trails - including easy hikes (for hiking, mountain biking and horseback riding) - in the park.

Empire Mine State Historic Park is one of the participating California State Parks that you can visit for free with the 4th Grade Adventure Pass.