, Northern Outcrop - Central (Penwyllt to Penderyn)
map using leaflet map:
The entrance shaft is situated in a deep depression on Pant Mawr to the West of the Nedd Fechan valley. Approach from SWCC HQ at Penwyllt for a one hour walk. The depression has a fence around it.
The caving rights over Pant Mawr moor are vested in the SWCC and persons wishing to visit the cave should apply for written permission. Daily permits are freely available from the SWCC HQ for all bona fide club cavers. Current Access arrangements
A fine cave of large proportions which contains a sizeable stream and some fine calcite decorations.
A 15 metre pothole leads to a chamber and after a boulder choke to a large passage which continues for over a kilometre via several boulder chokes. The cave ends in a sump, normally 122m long to an airbell in a fault guided rift blocked by boulders and gravel.
perhaps fround by Glennie and Platten, but first explored by Jim Braithwate 1936; G.Platten, E.E.Roberts,1937. Extended by W.Clarke & E.Aslett 1953; WSG 1993
Fluorescein test by Harvey in 1952 - 5 days to Little Neath River.
SSSI: 0930 Ogof Ffynnon Ddu-Pant Mawr (Mixed)
CRG Grade 5 Plan and Section in CRG Num. Pub. J.M.Alexander, J.C.Jones 1959
Caves and Caving 1, (3), 1937
Yorkshire Ramblers Club Journal 7, (23), pp.79-88, 1938
Welsh Review 2 (2), 1939. General
Cullingford,C.H.D. (1951), Exploring Caves, p.71
SWCC Newsletter 7, pp.3-6, 1954. Discovery of extensions
SWCC Newsletter 17, 3-5, 1956. Describes main prospects of extensions
CRG Newsletter 65, 4-5, 1957. Discovery of Rare Fly
CRG Num.Pub. 9, 1959. Location, description and survey.
SWCC Newsletter 33, 3-4, 1960. Access
SWCC Newsletter 33, 7-8, 1960. Lack of Oxygen in fire hydrant passage.
CDG nl.37, p.20 (1975)
WSG Bull 7, pp.38-39, 1993, Pant Mawr Pot revisited [above Hydrant Passage]