Burnyeat’s New Sinking, Ynysddu, 1904
Accident during shaft sinking. 7 died.

Maclaren Colliery No.1 Pit, Abertysswg, 1902
Methane explosion. 16 died.

Marine Colliery, Cwm, 1927
Methane explosion. 51 died.

Markham Colliery, Markham, 1912
Methane explosion possibly caused by a match being struck. 5 died.

Milfraen Colliery, Trerthen, 1902
Shaft Accident. 5 died.

Milfraen Colliery, Blaenavon, 1929
Methane explosion. 8 died.

Six Bells Colliery, Newport, 1960
Methane explosion caused by spark from a piece of quartz striking a steel girder. 45 died.

Tirpentwys Colliery, Tirpentwys, 1902
Shaft Accident. 8 died.

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