This drift worked a small patch of Colsterdale coal, which here dips eastward at 1 in 100, and is split into two leaves by a 2 inch (0.05m) dirt band. The top coal was 14 inches (0.35m) thick and the bottom leaf, or Lime Coal, was 9 inches (0.23m) thick.
Gill, M.C. “Great Dales Coalfield, Eastern Areas” British Mining No.86 (2008), pp.68-108
Gill, M.C. The Greenhow Mines (British Mining No.60, 1998)