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Cefn Coed Colliery, Crynant, Neath-Port Talbot, Wales, UK

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Latitude & Longitude (WGS84): 51° 42' 53'' North , 3° 45' 32'' West
Latitude & Longitude (decimal): 51.71479,-3.75891
UK National Grid Reference:SN785033
Other/historical region names associated with this locality:West Glamorgan; Glamorgan
Other regions containing this locality:Glamorgan, Wales, UK


Brammallite was identified by X-ray diffraction by the Natural History Museum, London, from the Dulais Seam at Cefn Coed Colliery (X2424). The specimen has not been catalogued into the NHM Collection and no further details are known.

Apart from the type locality, Llandebie, Cefn Coed Colliery is the only other Welsh locality for brammallite.

Cefn Coed Colliery, an anthricite pit, was opened by the Llwynonn Colliery Company during the 1920's and was taken over by the Amalgamated Anthracite Collieries Ltd in 1928. By 1945 there were 908 men employed.

Production ceased in 1968, but the shafts were kept open to provide access and ventilation for the New Blaenant drift mine, which occupied the same site.

The colliery is now a mining museum.

Mineral List


1 valid mineral.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Westphalian - Moscovian
307 - 315.2 Ma
South Wales Upper Coal Measures Formation

Age: Pennsylvanian (307 - 315.2 Ma)

Stratigraphic Name: South Wales Upper Coal Measures Formation of South Wales Coal Measures Group

Lithology: Mudstone, siltstone, sandstone, coal, ironstone and ferricrete

Reference: British Geological Survey. DiGMapGB-625. British Geological Survey ©NERC. [23]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License



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