Largest cave in North Wales with a vertical range of 110m. Access controlled by NWCC with Guide System.
Access is through mine workings.
100m entrance shaft (sometimes the NWCC have a winch on the shaft), followed by 10m, 15m and 20m shafts leads to about 8km of natural passages. Part of the Minera Mountain Cave System which includes Ogof Cefn-y-Gist, Ogof Llyn Du and Ogof Dydd Byraf, all as yet unconnected
SSSI: 0482 Ruabon/Llantysilio Mountains and Minera (Mixed)
Appleton 1987, CaC 37
CaC 37, pp.30-33, 1987, Peter Appleton, The Discovery of Ogof Llyn Parc