30 CFR 57.4533 - Mine opening vicinity.

Regulations last checked for updates: Feb 06, 2026

Title 30 - Mineral Resources last revised: Jan 27, 2026

View all text of Subpart C [§ 57.4000 - § 57.4761]

§ 57.4533 - Mine opening vicinity.

Surface buildings or other similar structures within 100 feet of mine openings used for intake air or within 100 feet of mine openings that are designated escapeways in exhaust air shall be—

(a) Constructed of noncombustible materials; or

(b) Constructed to meet a fire resistance rating of no less than one hour; or

(d) Covered on all combustible interior and exterior structural surfaces with noncombustible material or limited combustible material, such as five-eighth inch, type “X” gypsum wallboard.

authority: 30 U.S.C. 811.

source: 50 FR 4082, Jan. 29, 1985, unless otherwise noted.

cite as: 30 CFR 57.4533