30 CFR 75.1202-1 – Temporary notations, revisions, and supplements
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(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.