The Worlds Worst Mining Disasters - ThoughtCo
The death toll was 439, making it the most deadly mine accident in the UK. This was the worst of a spate of mine disasters in Wales that occurred during a period of poor mine safety from 1850 to 1930. On June 25, 1894, 290 died at the Albion Colliery in Cilfynydd, Glamorgan in a gas explosion. On Sept. 22, 1934, 266 died in the Gresford ...