Black Diamond Mines Loop Trail

MODERATE 116 reviews

Black Diamond Mines Loop Trail is a 5.3 mile heavily trafficked loop trail located near Antioch, California that features beautiful wild flowers and is rated as moderate. The trail offers a number of activity options and is accessible year-round. Dogs and horses are also able to use this trail.

5.3 miles
1,446 feet

dog friendly

kid friendly



horseback riding

mountain biking

nature trips

trail running




wild flowers




The hills of Black Diamond Mines Regional Preserve east of Concord, California, have been returned to their natural state, making them ideal for hiking, birdwatching and other outdoor adventures. It wasn't always like this: In the 1800s, a coal economy ruled the region. When the coal ran out, the miners moved on, leaving tombstones where towns once stood. Mining resumed years later: this time they dug sand for a local glassmaker. Tours of the old silica sand mines are a popular fixture of Black Diamond Mines. This route starts out in the parking lot on the old Somersville town site, passing the Rose Hill Cemetery and moving on to Nortonville, another town site lost to time.

1 month ago

Excellent hiking area. Trails are marked and easy to navigate. Mines are short but cool. Scenic!

2 months ago

This loop was one of the best hikes I have done in a while. I followed the red trail marker and didn’t take any deviations. Didn’t see any cows or cow poop, horse poop was minimal, and even though it was Memorial weekend Saturday, the people were minimal after passing the cemetery. It offered a nice variety of scenery and landscapes, vast views, trail surfaces, history, and several different geological formations and soil types. Although just outside of Antioch, it seemed much more remote. I will do this one again.

2 months ago

Loved everything about it

5 months ago

Great views!

5 months ago

Great views!

7 months ago

Some steep parts but nothing to bad. Good trail for the pups and the cemetery is neat!

Wednesday, July 05, 2017

Enjoyed this hike! Definitely has a few areas where you can go where it can be more challenging or easier depending on what you are looking for. Awesome place for pups! Only negatory would be the very few shade spots.

Sunday, May 14, 2017

overall good but long day if you bring the kiddos. our little one, 8yrs had a couple break downs due to the heat but we ended up back at the car finishing 6.75 miles. Got a tad lost in the beginning, the trail wasn't clearly marked at the start. Nice views, would do again.

Saturday, May 06, 2017

this was an ok scenery until you get to the other side of the mountain. over all good.

Wednesday, March 01, 2017

beautiful views, and decent trails to walk on. one of my favorite spots in the area!

Wednesday, February 15, 2017

amazing place with spectacular views.

Monday, November 14, 2016

Good trail, did it with 10lb packs to give a couple people a "backpacking simulation". Good day!

Wednesday, October 26, 2016

The trail goes through 3 different old mining sites and the Rose Hill Cemetery. It as some pretty good hills and is on the upper side of moderate. I did it in late march so there were some wildflowers starting to bloom. Very good winter and spring hike and probably a 3 1/2 stars for me.

Wednesday, October 19, 2016

Beautiful golden grassy area, loves the scenery. Far away from everything!

Saturday, September 17, 2016

Good trail that isn't that steep but hot. Best done any time but in the summer heat.

Friday, September 09, 2016

I started at the Nortonville Trail, continued onto the Black Diamond Trail, I followed the Black Diamond Trail and completed the loop. Total distance was 5.4 miles, 1,227 feet elevation. Most trails were wide and easy graded except the last couple miles were single track. I enjoyed reading all of signs that showing the historical local coal mining. I also enjoyed views of the surrounding area.

Sunday, September 04, 2016

Great hike.

Sunday, September 04, 2016

Loved the history of the mines, their cool temperature was a welcome relief from hot weather. Walking on sand trails was unique for a non-beach setting. Needed more trail markers and remember to have cash for parking.

Friday, August 26, 2016

Nice hike with beautiful views once you reach the top. The first half of the hike, to about the 2.5 mile mark, is steep but once halfway it's mostly downhill from there. Go early in the morning, especially in the summer months, to avoid the heat and bring plenty of water.

Thursday, July 14, 2016

Not much shade in some spots. There are some really tough increments to start and finish.

Overall... Fantastic views. Clean. Clear. Can't wait to go again.

Sunday, June 26, 2016

i loved this trail, quite steep for a bit but worth it for the views.

Sunday, May 22, 2016

Beautiful area

Friday, April 22, 2016

It is a very well kept and has vast open space. It ranges from easy to moderate but has great views no matter which direction you are traveling. We spotted some wild turkeys and near the beginning of the loop there are cows grazing. It's great place to get out doors and get some exercise and bring the family too! As well bring a picnic if you prefer, they have a picnic area too!

Saturday, April 02, 2016

Excellent, for an early morning hike. Lots for nice vistas and open space.

Friday, April 01, 2016

Nice day and beautiful place.

Saturday, February 06, 2016

Great place to go for a hike with many options for length of trails. Dog friendly! Which is a huge plus for me. I took my kids and dogs on a 6 mile hike. It was beautiful!

Sunday, August 09, 2015

Beautiful views of the rolling hills and valleys.

mountain biking
Wednesday, December 31, 2014

I grew up in Antioch, and have rode and hiked Black Diamond many, many times. Springtime is best, with all of the wildflowers in bloom. The scenery coupled with all of the history is absolutely fantastic.

Friday, April 26, 2013

Great views and very well maintained facilities. Dogs are allowed off leash 200 ft past trailheads and my 3 had an absolute blast. The trails are easy to follow and maps were abundant. Be prepared to walk up hill a lot, the trails go up and down the ridges.

Monday, April 08, 2013

A nice spot to hike nestled beside the town of Clayton. Trails were in good condition. At the time, in early spring when we hoofted it, the crowds were at a minimum. Decent views of the east bay, as well as interesting points to explore offered by the mines.

Good variety of trails and great for all ages.

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