The Hazel-Atlas mine in Antioch, a dormant operation that extracted coal and silica from the foothills of Mount Diablo, has tours available.

If you go

  • Where: Black Diamond Mines Regional Preserve, 5175 Somersville Road, Antioch
  • Hours: Visitors center open 10 a.m. to 4:30 p.m. on weekends from March through November; mine tours require reservations; call 510-544-2750
  • Cost: Tours are $5; parking is $5
  • More information: ebparks.org/parks/black — diamond.
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