The former Chatterley Whitfield colliery near Tunstall. It was once one of 22 collieries on the Staffordshire coalfield, and one of only 2 remaining in preservation (the other being Apedale). The site was turned into a museum, but this closed in 1991 and the site is not normally open to the general public except by arrangement. The colliery opened in the first half of the 19th Century, and was the first to produce a million tons in a year. However, after World War II, as oil imports increased, the coal industry contracted and output dropped from more than a million tonnes a year inn 1937 to 408,000 tons in 1965. In 1974 it was decided that Whitfield coal could be more easily worked from Wolstanton Colliery and an underground roadway was driven to join the two pits. In 1976 coal drawing at Chatterley Whitfield came to an end. It was then run as a mining museum, but closed in 1991. Since then the site has opened occasionally, but has fallen into disrepair and only two buildings are accessible – the Lamp House and the Bath House. English Heritage has decreed that the site is of national importance but requires around £25 million spending on it.