Collieries after Nationalisation in 1947

Dates in brackets indicate the date that the colliery merged with another
Name Opened Closed (Merged)
Abercrave 1855 March 1967
Blaenant Level 1976 May 1990
Brynhenllis 1885 August 1955
Brynteg 1875 November 1954
Cefn Coed 1920 April 1968
Crynant 1871 March 1956 Not shown on the map
Dillwyn 1895 April 1966
Garth Merthyr 1937 October 1959
Gleison 1913 July 1947
International 1895 March (1947) Absorbed by Abercrave
Mountain Level 1890 March 1956
Pwllbach 1925 January 1966
Seven Sisters 1872 May 1963
Tareni, No.1 1902 July 1947
Tareni, No.2 1902 February 1949
Tirbach 1899 September 1940 Used as a Training Centre until 1961
Treforgan 1963 1985 Not shown on the map
Varteg 1925 November 1964
Yniscedwyn 1890 March 1968
Ynysarwed 1904 December 1955
Ystalyfera 1910 August 1957

Collieries that closed before 1947 and those worked under licence

Brynderi Colliery Gurnos
Bryngroes Colliery Ystradgynlais
Bryn Morgan Colliery
Cilfrew Colliery Crynant
Danygraig Colliery Crynant
Diamond Colliery Ystradgynlais
Dulaise Colliery Onllwyn
Gilfach Colliery Ystalyfera
Gilwen Colliery Ystalyfera
Gurnos Colliery Ystradgynlais
Gwaunclawdd Colliery Ystalyfera
Hendreforgan Colliery Ystrad Owen
Nantgwyn Colliery Cwmllynfell
Pantmawr Colliery Ystradgynlais
Parc Colliery Cwmllynfell
Pentwyn Colliery Gurnos
Ystrad Colliery Ystradgynlais
Ystrad Owen Colliery
Ystradgynlais Colliery Ystradgynlais

Small Collieries of the Dulais Valley
Small Collieries of the Swansea Valley
Small Collieries of the Swansea Valley worked under NCB Licence

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