The engine house and headframe at the No.4 shaft date from the 1930s. The house is characteristic of the common engine halls developed by Powell Duffryn from 1906 onwards, but on an unusually small scale. It incorporates a winding engine, compressor engines, electrical switch-gear and a Sirocco ventilating fan.
B.A.Malaws, RCAHMW, 13 March 2012.