Fluorescein test by Harvey in 1952 - 5 days to Little Neath River. sump

L:2220
V:105

Pant Mawr Pot, Pwll Pant Mawr, Pant Mawr, Fan Fraith Pot


NGR: SN 89090 16127
436 m.asl

Powys , Northern Outcrop - Central (Penwyllt to Penderyn)
 map using leaflet map:
Pothole
Access 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. See caving.wales for current Access arrangements
Description 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.
History perhaps fround by Glennie and Platten, but first explored by Jimmy Braithwate 1936; G.Platten, E.E.Roberts,1937. Extended by W.Clarke & E.Aslett 1953; WSG 1993
Hydrology Fluorescein test by Harvey in 1952 - 5 days to Little Neath River. Tests
Conservation SSSI: 0930 Ogof Ffynnon Ddu-Pant Mawr (Mixed) GCR: 553 Biological records
Gallery

BCL/Gerard Platten
1937
Brendan Marris
2008
Rhys Williams
2007
Keith Edwards
2014
Survey
CRG Grade 5 Plan and Section in CRG Num. Pub. J.M.Alexander, J.C.Jones 1959
References
Caves and Caving 1, (3), 1937
Yorkshire Ramblers Club Journal 7 (23), pp.79-88, Fan Fraith Pot
BSA Conference Programme, Swansea 1939, p.23
Welsh Review 2 (2), 1939. General
Cullingford,C.H.D. (1951), Exploring Caves, p.71
Britain Underground, 1953
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. The Survey of Pant Mawr Pot, South Wales, 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]
Caves of South Wales, Stratford, T., 1995
Selected Caves of Britain and Ireland, 1997
Peter I.W.Harvey 2009 The Exploration of Pant Mawr Pot
WSG Bull 7, p.39, 1993, [above Hydrant Passage]
CDG nl.135, p.14 (2000)
Welsh Sump Index, 2006
Brendan Marris Caves of South Wales
Search for further records Browse registry map
Cambrian Cave Registry entry 398
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