, Northern Outcrop - West (Black Mountain)
map using leaflet map:
Cave in bank near sink North East of Trig. Point
Nig Rogers et al - Grwp Ogofeydd Garimpeiros; dig at base of cliff (now collapsed) went August Bank Holiday 1989 through upward corkscrew squeeze. A higher entrance was subsequently engineered by unknown persons. Latest extension was in October 1996.