30 C.F.R. § 75.1200-2 Accuracy and scale of mine maps.
Title 30 - Mineral Resources
(a) The scale of mine maps submitted to the Secretary shall not be less than 100 or more than 500 feet to the inch. (b) Mine traverses shall be advanced by closed loop methods of traversing or other equally accurate methods of traversing.
Title 30: Mineral Resources
PART 75—MANDATORY SAFETY STANDARDS—UNDERGROUND COAL MINES
Subpart M—Maps
§ 75.1200-2 Accuracy and scale of mine maps.
