Regulation 138A manager of a mine shall ensure that in the mine,(a) main travelling ways which exceed twenty metres in depth and which are at an inclination of more than seventy degrees from the horizontal, platforms or rest places are provided at distances of not more than ten metres apart;(b) a ladder is not erected at a greater inclination than eighty degrees from the horizontal, and is placed in a manner that enables it to cover the manholes of the rest places;(c) a ladder is positioned vertically only under exceptional circumstances and with the written consent of the inspector;(d) a ladder which is used for any purpose connected with the mine is sufficiently strong, and securely fastened to the timbering or sides of the shaft or working, and maintained in proper repair;(e) the space between the rungs of each ladder does not exceed thirty centimetres;(f) the rungs of each ladder is(i) not less than a distance of twelve centimetres from the wall against which the ladder is placed; and(ii) kept clear of everything which might interfere with the foothold;(g) a ladder is not positioned in travelling ways in an overhanging position; and(h) a ladder projects at least one metre above the entrance of the shaft, winze, raise or other excavation and above the landing place in which the ladder is installed except where strong hand rails are fixed at the entrance or landing place.