§75.1202-1. Temporary notations, revisions, and supplements.
30 C.F.R. § 75.1202-1
Mine maps shall be revised and supplemented at intervals of not more than 6 months.
Temporary notations shall include:
The location of each working face of each working place;
Pillars mined or other such second mining;
Permanent ventilation controls constructed or removed, such as seals, overcasts, undercasts, regulators, and permanent stoppings, and the direction of air currents indicated;
Escapeways and refuge alternatives designated by means of symbols.
Notes, amendments, and revision history
Amendments
[35 FR 17890, Nov. 20, 1970, as amended at 73 FR 80697, Dec. 31, 2008]
Authority
Authority: 30 U.S.C. 811, 813(h), 957.
Source
Source: 35 FR 17890, Nov. 20, 1970, unless otherwise noted.
Amendments
[35 FR 17890, Nov. 20, 1970, as amended at 73 FR 80697, Dec. 31, 2008]