Ariz. Admin. Code § 11-1-1841
Current through Register Vol. 30, No. 50, December 13, 2024
Stoppings in crosscuts between intake and return airways, on entries other than room entries, should be built of solid, substantial material; exposed surfaces should be made of fire-resistant material such as gunite-covered wood or material, asbestos sheeting, masonry, concrete or reinforced concrete, and steel or covered steel. If the material mined is combustible, stoppings should be made of incombustible material.
Ariz. Admin. Code § R11-1-1841