This once 150 feet deep air shaft was put in place to ventilate a coal mine to keep it free from dangerous gasses. There is a short tunnel to access the interior and get a closer look. On the excavation sides, there is still evidence of marks left by the picks from miners.

Sue

January 8, 2024

Mountain biking

This once 150-foot-deep air shaft was put in place to ventilate a coal mine to keep it free from dangerous gasses. There is a short tunnel to access the interior and get a closer look. On the excavation sides, there is still evidence of marks left by the picks from miners.

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1. Nortonville and Black Diamond Trail Loop

17.5km

01:53

580m

Mountain bike the 10.9-mile Nortonville and Black Diamond Trail Loop, a moderate route with steep climbs, panoramic views, and historical si

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Moderate

4.0

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2. Stewartville Trail – Black Diamond Shaft loop from Deer Valley High School

32.1km

03:20

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Hard mountain bike ride. Very good fitness required. Suitable for all skill levels.

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Hard

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Elevation 420 m

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Monday 23 March

28°C

11°C

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Max wind speed: 15.0 km/h

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Location: Contra Costa County, California, United States

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Black Diamond Shaft

1. Nortonville and Black Diamond Trail Loop

2. Stewartville Trail – Black Diamond Shaft loop from Deer Valley High School

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