This underground slate quarry lies above the village of Abergynolwyn in mid-Wales. Active from 1840s for a century, the workings are extensive and can be explored via the CAL access scheme for entry on to underground sites owned by the Welsh Government or NRW.Photos by Stuart France.
CHELSEASPELÆOLOGICALSOCIETYCaving in Wales,the South of England,and beyond
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