Intersection of two tunnels
At the level of the shaft bottom, here two tunnels intersect.
The angle of the shot holes indicates they were driven from different directions and intersected with only about an eight inch variation in floor height; such was the skill of the surveyors.
Drws y Coed copper mine, Nantlle valley, north Wales.
This photograph is by SimonRL and was uploaded June 18th 2007. © SimonRL please do not copy or distribute without prior express permission.
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