om the surface, and thereafter and until the
slope or shaft reaches the seam, and the entry or landing be
extended beyond a breakthrough or other place driven at right angles
thereto, no explosive shall be fired except by means of an electric
battery operated from the surface after all persons are on the
surface. A substantial structure to sustain sheave wheels or
pulleys, ropes and loads, shall be provided, and if the opening be a
shaft, the same shall be placed at a height of not less than twenty
feet above the tipping place. A landing platform shall be arranged
in such manner that no material can fall into the shaft while the
bucket is being emptied, and in no case shall the shaft be sunk to a
depth of more than thirty feet without such structures. If the
bucket used for hoisting material is to land on a truck, the track
on which said truck is operated, and the platform, shall be so
constructed that material cannot fall into the shaft. Rock and coal
shall not be hoisted from a shaft or slope except in a bucket or
cage attached to the rope by a safety hook, clevis, or other safe
attachment, and the bucket or cage securely locked so that same
cannot tip or empty while being hoisted. The rope shall be fastened
to the side of the drum, and not less than three coils of rope shall
always remain on the drum. After the shaft reaches a depth of one
hundred feet, the same shall be provided with guides and guide
attachments, applied in such a manner as to prevent the bucket from
swinging while being lowered or hoisted, and said guides and guide
attachments shall be maintained at a distance of not more than
seventy-five feet from the bottom of the shaft. The sides of all
shafts shall be properly secured for safety, and no loose rock or
material shall be allowed to remain on any timber in the shaft after
each blast. All loose timber, tools, and materials, shall be kept
away from the top of the shaft, so as to reduce the danger of same
falling down the shaft. Where explosive gas is encountered, the
person in charge shall see that the shaft or slope is examined
before each shift of men enter to work, and before the men descend
after each blast. Provision shall be made for the proper ventilation
of the slope, or shaft, so that persons working therein will have
the necessary air. An efficient brake shall be attached to each drum
of an engine used in hoisting material and persons, and all
machinery, ropes and chains connected therewit