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San Francisco: Black Diamond Mines Loop

Explore historic sites on this 5.9-mile loop in the fascinating Black Diamond Mines Regional Preserve-once California’s largest coalfield.

Trip Tools

To Trailhead

I-580 E to CA 24 E to I-680 N to CA 4 E to Somersville Rd. S exit. Turn R at end of exit. Go 1.7 miles to park entrance. Park in upper parking lot.

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