MSHA - Code of Federal Regulations - 30 CFR 57.22102
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MSHA - Title 30 CFR
30 CFR § 57.22102
Smoking (I-C mines).
(a) Persons shall not smoke or carry smoking materials, matches, or lighters underground or within 50 feet of a mine opening. The operator shall institute a reasonable program to assure that persons entering the mine do not carry such items.
(b) Smoking is prohibited in surface milling facilities except in designated, dust-free smoking areas.