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Hike Details for Upper Parking Area

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Black Diamond Mines Regional Preserve
Upper Parking Area
RSVPs - 47 -- YES: 15 NO: 28 MAYBE: 4

Upper Parking Area
Click the Staging Area/Trail Name above for park information.
City: Antioch
Region: EastBay
Park: Black Diamond Mines Regional Preserve
Park Map URL: Click Here

Sunday, January 28, 2018 @ 9:30 AM


Event Notes:

Two Mines and a Tunnel


Join us at 9:30am for your choice of a moderate+ 8 mile/1600' shorter hike or a challenging 9 mile/2000' long hike. Bring a FLASHLIGHT to navigate the tunnel! Please download and print out the trail route map here.

Route will be Somersville, connector trail to Eureka Slope mine entrance. Continue on Chapparal, left to Lower Chapparal straight up to Ridge. Left on Ridge, right at iron gate, then left to stay on Ridge. After 2 miles Ridge Trail dead ends, right on Stewartville for 1 mile, then right to Prospect Tunnel. Explore the tunnel which runs 400' into the mountain, then return to Stewartville. The hikes diverge here. Short hike continues right on Stewartville and breaks at the Stewartville Backpack Camp. Continue on Stewartville all the way up to the iron gate, go through it and straight on down the hill on Stewartville. At the end, turn right on Somersville to the cars.

The long hike continues straight across Stewartville onto Star Mine Trail, breaking at Star Mine Group Camp. Continue on Star Mine following it to the right until you rejoin Stewartville, making a left to join the other hike and following the directions above. Both hikes may choose an optional detour making a right on Miners Trail, a steeper and more difficult route.

Dogs allowed. Facilities at start and at the breaks. Flour arrows will guide your route, please print out your own map using the link above. Trailhead Directions and google map are available by clicking the link in that section.

Contact: Steve Smith
Email: [email protected]
Cell Phone: (925) 325-0805


Trail Notes:

Black Diamond Mines Regional Preserve offers over 65 miles of hiking trails on over 6000 acres of hills and valleys.


Trailhead Directions:
Click Here for a Map

From Highway 4, take exit #26A. Turn right on Somersville Rd and head south 1.4 miles. Continue straight through the entrance gate on Somersville, do not make any turns, following it all the way into the park, about 1.2 miles. Continue past the lower parking area for 1 mile to the end of the road, parking on the right.

Parking Fee: $5 Weekends

The trailhead information on this page was last updated
Thursday, November 30, 2017.

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