while working in sallet hole in around 1990 we were long holeing on i think g drive memory bad,for names, anyway 2 of us were chareing holes through an air breech and one guy was mucking out a slit at the side ok us, i was on a tower scaffold using the chargeing tube when i felt a large blast of air from above so i jumped off the scaffold running and round the corner of slit and down the heading, the slit had run bringing alsorts down with it including fenceing and old drums this was somewhere under longsone edge possibly hodges old spar rake so that what has come in could be from open ground left as some of it was not to far from the surface so it wouldnt suprise me. also alot of the lower levels mainly at the end of the adit past the old chargeing staition go left and keep going down and not up the incline was very wet and sticky we salvaged all the old rings from down there at around the same time. tom