Statutes, codes, and regulations
Wyoming Administrative Code
Agency 053 - Workforce Services, Department ofSubagency 0004 - Mining InspectorChapter 3 - UNDERGROUND METAL/NONMETAL MINES
Subpart T - Safety Standards for Methane in Metal and Nonmetal Mines
Section 57.22221 - Overcast and undercast construction (I-A, II-A, III, and V-A mines)

053-3 Wyo. Code R. § 57.22221

Download
PDF
Current through April 27, 2019
Section 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;

(c) Kept clear of obstructions.

053-3 Wyo. Code R. § 57.22221