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35 FR 17890, Nov. 20, 1970, unless otherwise noted.
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The provisions of this part marked [Statutory Provision] appear in Title III of the Federal Coal Mine Health and Safety Act of 1969.
(a) Mine maps shall be revised and supplemented at intervals of not more than 6 months.
(b) Temporary notations shall include:
(1) The location of each working face of each working place;
(2) Pillars mined or other such second mining;
(3) Permanent ventilation controls constructed or removed, such as seals, overcasts, undercasts, regulators, and permanent stoppings, and the direction of air currents indicated;
(4) Escapeways and refuge alternatives designated by means of symbols.
[35 FR 17890, Nov. 20, 1970, as amended at 73 FR 80697, Dec. 31, 2008]