30 CFR § 57.22101
Smoking (I-A, II-A, III, and V-A mines).
FIRE PREVENTION AND CONTROL
[NOTE: The Category or Subcategory applicability of each standard appears in
the parentheses of each standard's title line].
Persons shall not smoke or carry smoking materials, matches, or lighters
underground. The operator shall institute a reasonable program to assure that
persons entering the mine do not carry such items.