MOUNT DIABLO COAL FIELD
This was the largest coal-mining district in California from 1860 to 1914, with five towns-Nortonville, Somersville, Stewartsville, Judsonville, and West Hartley-near twelve major mines. Today the towns are gone, their buildings moved to other communities after the mines closed - the East Bay Regional Park District is preserving mine openings, tailings, railroad beds, and a pioneer cemetery.
Registration Date: 5/13/1980
County: Contra Costa
Black Diamond Mines Regional Park, from State Hwy 4 take Somersville Rd 3.9 mi S, Antioch
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