Black Diamond was California's largest coal mining district and a major source of commercial sandstone. Today's park is full of trails, nature, and history.
Nestled near the base of Mount Diablo, Black Diamond Mines Regional Preserve was the site of California's largest coal mining operations from the 1860s to 1900, and was a major source of commercial sandstone from the 1920s-1940s. Today the area has 60+ miles of trails and many natural and historic features to explore. Park naturalists offer fun and informative programs both above and below ground and support other regional park operations throughout central and eastern Contra Costa County.
