Black Diamond Mines Regional Preserve
The Black Diamond Mines Regional Preserve is a 6,000-acre park located north of Mount Diablo in Contra Costa County, California under the administration of the East Bay Regional Park District. The district acquired the property in 1973
- 5175 Somersville Rd
- Antioch, CA 94509
- Phone: (510) 544-2750
- Hours: Tuesday 8AM–8PM Wednesday 8AM–8PM Thursday 8AM–8PM Friday 8AM–8PM Saturday 8AM–8PM Sunday 8AM–8PM Monday 8AM–8PM