This system is a combined length of 2598 Metres and depth of 76 Metres. The connection between both Mines was made in 1969.
See entry of Hillocks Mine or Knotlow Cavern for Access Information.
More information regarding the history of these systems can be found in Iain Barker, Classic Caves of the Peak District, 1997, Redwood Books.
Hillocks Mine, p.79-82. Knotlow Cavern, p.95-100.