Thats Hafodyrynys Colliery's Slurry Tower, Hafodyrynys was a drift mine developed in the 1950's as a modern colliery but it experienced major geological diffculties and closed in the mid sixties. The washery remained processing coal from neigbouring mines Glyntillery, Tirpentwys and Blaenserchan to which it was linked underground, Glyntillery colsed soon after and when Tirpentwys closed in 1977 the coal produced in Blaenserchan which was located beyond Tirpetwys was diverted elsewhare and there was no coal left for Hafodyrynys to process. The washery tower was the only bit of the collery except for the retaining wall along the road site to be saved, because it is of a unique design most washery slurry towers of the same period are like funnels planted in the ground. A lot of the slury mix machinery is still in situ on the top level but is really dificult to get up to it.