with steps climbing up or stepping down between tunnel levels.
Tour ends near the mouth of a tunnel which houses mining exhibits and a gift shop.
Black Diamond Mine August 2012 |
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| Volunteer Interpretative Docents van pooled to Contra Costa County. |
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| Historical site managed by the East Bay Regional Park District. |
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| Black Diamond Mine tour guide gave short overview of history of site. |
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| At one time the area supported three small mining communities. |
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| Tunnel entrance with mining displays. |
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| Tour guides issued each visitor a hard hat and flashlight for the mine tour. |
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| Walls of the tunnel dotted with coal deposits. |
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| Coal seams varied in size and length. |
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| Tour followed the mine shaft for some distance, with steps climbing up or stepping down between tunnel levels. |
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| Tour guide points to large seam of coal. |
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| Length, quality of coal seam determined if it was worth extracting. |
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| View through a connecting tunnel to another level. |
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| Group with mining artifact. |
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| Mine operation managers spent their work days underground. |
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Tour ends near the mouth of a tunnel which houses mining exhibits and a gift shop. |
| Return to Top. |