George Insole and his son
James Harvey Insole owned the mineral rights to the land at Cymmer. Several collieries were sunk in the vicinity, namely Cymmer Colliery (Old No. 1 Pit) (1847), Glynfach Colliery (1851), New Cymmer Colliery (1855), Upper Cymmer Colliery (1851) and Ty-Newydd Colliery (1852), not to mention the several other collieries of Porth and Trehafod. In 1856 the Old Pit mine was the site of a mining disaster in which 114 men and boys were killed. The official inquest into the deaths found that inadequate ventilation had caused a build up of gas which was ignited by the use of naked flames underground, and the inquest jury brought in an indictment of manslaughter against the mine manager and four officials. However, at the ensuing trial at the Spring
Assizes in Swansea in 1857, the cases against two were dismissed, the judge directed the jury to discharge one of the others and advised them to acquit the remaining two, which they did. The Cymmer community seethed with rancour and the bitter feelings lasted for many years. No compensation was paid to the families of the miners concerned. The writer and broadcaster
Gwyn Thomas (1913–1981) was born and brought up in Cymmer. ==Governance==