Collieries after Nationalisation in 1947
| Name | Opened | Closed (Merged) | ||
|---|---|---|---|---|
| Abernant | 1953 | February | 1988 | |
| Cwmgorse | 1905 | May | 1964 | |
| Cwmllynfell | 1905 | January | 1959 | |
| Daren | 1935 | October | 1964 | |
| Felinfran | 1935 | December | 1965 | |
| Gelliciedrim | 1891 | November | 1957 | |
| Glanamman | 1890 | January | 1948 | |
| Gwaun-cae-Gurwen, General | 1886 | October | 1962 | |
| Gwaun-cae-Gurwen, East Pit | 1910 | October | 1962 | |
| Gwaun-cae-Gurwen, Maerdy Pit | 1886 | January | 1948 | |
| Gwaun-cae-Gurwen, Steer Pit | 1924 | January | 1959 | |
| Hendy Merthyr | 1930 | November | 1960 | |
| Normandy Level | 1944 (1863) | 1951 (1978) | (Part of Clydach Merthyr Colliery) | |
| Tylwydyn | 1937 | September | 1949 | |
| Wernos | 1905 | November | 1965 | |
