Black Diamond Mines

Contra Costa County, East Bay, California · Regional Preserve

A 6,000-acre East Bay Regional Park in Contra Costa County featuring 60 miles of trails through rolling grasslands, oak woodlands, and chaparral. Renowned for its 19th-century coal mining history, with preserved mine tunnels, ghost town remnants, and guided underground tours.

Campgrounds

• Stewartville Backpack Camp — 516 ft · reserve

Top trails

• Nortonville and Black Diamond Loop — 5.9 mi loop
• Black Diamond Mines Ridge Trail Loop — 8.0 mi loop

Visiting

Fees — Vehicle: $5, Dog: $2.

Parking: The main Somersville Road lot charges $5 per vehicle when the kiosk is attended (weekends and holidays); the Fredrickson Lane Staging Area provides free parking as an alternate trailhead.. Dogs allowed on leash. Phone: (510) 544-2750.

Coordinates: 37.9564, -121.8497. Official website.

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