MSHA - Code of Federal Regulations - 30 CFR 57.19111
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MSHA - Title 30 CFR
30 CFR § 57.19111
Shaft-sinking ladders.
Substantial fixed ladders shall be provided from the collar to as near the shaft bottom as practical during shaft-sinking operations, or an escape hoist powered by an emergency power source shall be provided. When persons are on the shaft bottom, a chain ladder, wire rope ladder, or other extension ladders shall be used from the fixed ladder or lower limit of the escape hoist to the shaft bottom.