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Black Diamond Mines

Black Diamond Mines Regional Preserve

November 21st, 2020

8.2 miles
1513 vertical feet
Total Time: 3:28

Starting elevation
726 feet
Max elevation
1259 feet

Rating: 7/10

Directions: From Concord, take Highway 4 to the Somersville Road exit. Turn right onto Somersville Road and follow it all the way into the park, then continue to the parking lot at the end of the road.   View Driving Map



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GPX File

It was a bright sunny but cool fall morning as we prepped in the parking lot. The visitor centers and mine were closed because of COVID-19, but the park was open for hiking.

We started off from the parking lot and then almost immediately turned left onto the Stewartville Trail. It's a wide dirt fire road with little shade. You definitely don't want to be here in the dead of summer. But here in the fall the temperatures were pleasant. The hills were golden, but will turn green in the spring.

View from the start of the Stewartville Trail

The trail starts climbing from the start, and we soon reached an intersection and the start of the loop section of our hike. To the left was the Ridge Trail, and to our right was the continuation of the Stewartville Trail. We could have taken either, but we decided to continue on the Stewartville Trail.

Looking back down the Stewartville Trail

Tree next to the Stewartville Trail

There's shortly a narrow side trail to the left - the Miners Trail. You could take it, or continue on the Stewartville Trail - they both end up in the same place, but the Miners Trail is slightly shorter. We continued on the Stewartville Trail as it started a descent.

The trail levels off for a bit at the bottom, and passes the Stewartville Backpack Camp. Yes, you can do a short backpacking trip into the park, although the camp is currently closed due to COVID-19.

We continued along the mostly flat trail now, but it soon started climbing again. We mistakenly missed the turn for the Ridge Trail, but shortly retraced our steps a couple minutes and started up the steep Ridge Trail. As we climbed, we got better and better views looking to the north. We could see what I'm guessing is Contra Loma reservoir, Antioch, Suisun Bay, and the windmills of Montezuma Hills.

Mining remnants

Looking north from the Ridge Trail

Looking back (east) along the Ridge Trail

After a tough climb, the trail levels off and then descends to the intersection where we had started our loop. We now returned toward the parking lot on the Stewartville Trail. However, before we got there, we turned left and then right toward the Rose Hill Cemetery. It's a short but tough little climb up to the cemetery.

Looking north from further up the Ridge Trail

The park used to be the site of coal mining, with Stewartville, Somersville, and Nortonville Townsites. Over 200 residents of those old towns are buried at Rose Hill Cemetery, dating from the latter half of the 1800s. Many of the headstones remain, despite some vandalism.

Rose Hill Cemetery

After touring the area, we returned to the now-full parking lot. If you arrive late and have to park in the main lot near the visitor center, it's about 0.8 miles from there to the secondary lot.


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