The East Bay Regional Park District began acquiring land for Black Diamond Mines Regional Preserve in the early 1970s.
Black Diamond Regional Mines Preserve Reopens Visitor Center
Black Diamond Mines Regional Preserve, Antioch, California Stock Photo - Alamy
Black Diamond Mines Regional Preserve
Trip Report: Black Diamond Mines
BLACK DIAMOND MINES REGIONAL PRESERVE - 898 Photos & 199 Reviews - 5175 Somersville Rd, Antioch, California - Parks - Phone Number - Yelp
Exploring Black Diamond Mines in Antioch, California USA Walking Tour #blackdiamondmines #antioch
File:Black Diamond Mines Regional Preserve - Rose Hill Cemetery - panoramio (1).jpg - Wikimedia Commons
10 Best Trail Running Trails in Black Diamond Mines Regional Preserve
BLACK DIAMOND MINES REGIONAL PRESERVE - 898 Photos & 199 Reviews - 5175 Somersville Rd, Antioch, California - Parks - Phone Number - Yelp
Black Diamond Mines Regional Preserve
Black Diamond Mines Regional Preserve, Antioch, California Stock Photo - Alamy
BLACK DIAMOND MINES REGIONAL PRESERVE - 898 Photos & 199 Reviews - 5175 Somersville Rd, Antioch, California - Parks - Phone Number - Yelp