Old Prosperous Level, Gateup Gill
This is a cross-section of Old Prosperous Level in Gate Up Gill - part of the Hebden mining liberty. The entrance is at NGR SE 0550 6657 at an altitude of about 350 metres, in the corner between the beck and an enclosure wall. It was originally driven around 1830 to serve as an adit to shafts in the Groove Gill Area, and to work the Bycliffe Vein. It also contained a 27 cm-thick coal seam, marked as the thick black line on Beast Level, which was also exploited. This cross-section must date from later, as it indicates that the levels were being cleared, probably from the mid-1850s when the Hebden Moor Mining Company were establishing what they had inherited from previous lease holders.