Early coal workings would have been shallow, probably bell pits; the nearest, deeper shaft marked on the Ordnance Survey map is about 800 m north of Cowley at SK337778, on the edge of modern Dronfield.
Initial coal excavations would have been shallow, likely pit mines; the closest, deeper shaft indicated on the Ordnance Survey map is approximately 800 m north of Cowley at SK337778, situated on the edge of modern Dronfield.