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.
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