MSHA - Code of Federal Regulations - 30 CFR 75.215
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MSHA - Title 30 CFR
30 CFR § 75.215
Longwall mining systems.


For each longwall mining section, the roof control plan shall specify--

(a) The methods that will be used to maintain a safe travelway out of the section through the tailgate side of the longwall; and

(b) The procedures that will be followed if a ground failure prevents travel out of the section through the tailgate side of the longwall.