30 CFR 57.22221 - Overcast and undercast construction (I-A, II-A, III, and V-A mines).

Regulations last checked for updates: May 19, 2024

Title 30 - Mineral Resources last revised: May 15, 2024

View all text of Subpart T [§ 57.22001 - § 57.22608]

§ 57.22221 - Overcast and undercast construction (I-A, II-A, III, and V-A mines).

Overcasts and undercasts shall be—

(a) Of substantial construction;

(b)(1) Constructed of noncombustible materials; or

(2) Where constructed of combustible materials, the outside surfaces shall be coated with at least one inch of construction plaster containing perlite and gypsum; at least one inch of expanded vermiculite, Portland cement and limestone; or other coatings with equivalent fire resistance;

authority: 30 U.S.C. 811.

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

cite as: 30 CFR 57.22221