§ 33.94. Shafts being sunk.
(a) Over all shafts, as they are being sunk, a safe and substantial structure shall be erected in order to sustain the sheaves and pulleys. This structure shall be not less than 20 feet above the tipping place. Arrangements shall be made at the top of each shaft so that no material may fall into the shaft while the bucket is being emptied. This structure shall be erected as soon as a substantial foundation is obtained and in no case shall a shaft be sunk to a depth of more than 50 feet without the structure.
(b) If provision is made to land the bucket in which the material is being hoisted on the truck, the truck shall be constructed so that material cannot fall into the shaft.
(c) No material lifted from shafts being sunk shall be raised except in a bucket. This bucket shall be connected to the cable or chain by a safety hook, a clevis or other approved attachment.
(d) Shafts being sunk shall be provided with guides and guide attachments so applied as to prevent the bucket from swinging while ascending or descending. Guides and guide attachments shall be maintained at a distance of not more than 100 feet from the bottom of the shaft until its sinking has been completed. This requirement does not apply to shafts 100 feet or less in depth.
(e) Not more than six persons shall be hoisted or lowered at the same time on a bucket in any shaft. No person may ride on a loaded bucket at any time. The speed of hoisting or lowering men shall not exceed 800 feet per minute.
(f) Whenever persons are employed on platforms in shafts, the mine foreman or other person in charge of the work shall insure that the platforms are properly and safely constructed.
(g) After each blast in a shaft, the person in charge of the blast shall insure that all loose material is swept down from the timbers before the workmen descend.
(h) After a suspension of work and after the firing of each blast in a shaft, the mine foreman shall be responsible for having the bottom of the shaft examined and tested for gas by a competent person. No workmen shall descend until this examination has been completed.
(i) No person shall be permitted to do any work in a shaft when drillers or muckers are working at the bottom of a shaft.
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