MSHA - Code of Federal Regulations - 30 CFR 57.19072
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MSHA - Title 30 CFR
30 CFR § 57.19072
Skips and cages in same compartment.
When combinations of cages and skips are used in the same compartment, the cages shall be enclosed to protect personnel from flying material and the hoist speed reduced to man-speed as defined in standard 57.19061, but not to exceed 1,000 feet per minute. Muck shall not be hoisted with personnel during shift changes.