The first right hand branch of the floor 4 level. After a short distance a low wall is reached and an impassable collapse beyond. This would have connected to chamber 5. See Cwmorthin Slate Quarry, J G Isherwood, page 66 for the relevant map.
This photograph is by simonrl and was uploaded August 3rd 2007. © simonrl please do not copy or distribute without prior express permission.
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