block No access to this site allowed.
Following series of collapses & fatalities, all entrances sealed or obliterated, except for Public tours into Royal Mine via Gulliver's Kingdom theme park. Part of Masson Hill SSSI.
(1953), , The Speleologist (Derbyshire) Vol.1. No.2., pp.63-67.,
(1973), , Bull. P.D.M.H.S. Vol.5. No 4., pp.182-199., Peak District Mines Historical Society
(2001), , Mining History. Bull. P.D.M.H.S. Vol.14. No.6., pp.1-34. Survey., Peak District Mines Historical Society
(2001), , A Cave and Mine Conservation Audit for the Masson Hill Area. D.C.A., , Derbyshire Caving Association
(2010), , Caves of the Peak District, p. 162, DCA