English Heritage's Buildings at Risk register! The first colliery in The UK to produce 1,000,000 tons of saleable coal in a year. Registered Charity 1183093 The Colliery site is acknowledged to be the most comprehensive survival of a deep mine in England. Heritage Centre open every Thursday and Saturday morning. Site visits arranged 2nd Saturday of the month. Check Facebook for details. The object of the CIO is to advance the education of the public in the history of mining at the former Chatterley Whitfield colliery by the demonstration of mining methods and the exhibition of machinery and ancillary matters connected with mining transportation social conditions and industrial archaeology and in such other ways as the trustees consider appropriate.