David Evans of the Evans-Bevan coal mining partnership, had wanted to call the colliery after his daughter, Isabella Bevan who cut the first sod on the land at Bryn Dulais farm with a silver spade on Monday, March 11 1872. However, in light of superstition, and the fact that his own six sisters attended the ceremony, Evans agreed to call the mine Severn Sisters.[
Resources - Coal
Anthracite coal fields always suffer from blow out, and on the 10th of November 1907, one occurred which killed 5 men. In 1923, there were 607 men working at Seven Sisters, producing from the Furnace Four Feet, Brass and Nine Feet Big Vein seams. During World War 2 the colliery featured in an anti-Nazi film The Silent Village, made with the cooperation of the South Wales Miners Federation.
During the 1950s geological problems and changing economic conditions took their toll, and in May 1963 the colliery closed and the pit filled in. The men who had been employed at the Seven Sisters were transferred to the nearby Blaenant Colliery, which closed in 1990.