Ariz. Admin. Code § R11-1-1841 - Stoppings in Crosscuts between Intake and Return Airways
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.
Notes
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