Black Diamond Mines Regional Preserve

	Black Diamond Mines
	U.S. National Register of Historic Places
	U.S. Historic district
	California Historical Landmark No. 932
Nearest city	Antioch, California
Coordinates	37°57′1″N 121°51′25″W
NRHP reference No.	91001425
CHISL No.	932
Added to NRHP	October 02, 1991

The Black Diamond Mines Regional Preserve is a 6,000-acre (2,400 ha) park located north of Mount Diablo in Contra Costa County, California under the administration of the East Bay Regional Park District (EBRPD). The district acquired the property in 1973. The preserve contains relics of 3 mining towns, former coal and sand mines, and offers guided tours of a former sand mine. The 60 miles (97 km) of trails in the Preserve cross rolling foothill terrain covered with grassland, California oak woodland, California mixed evergreen forest, and chaparral.

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