Ariz. Admin. Code § 11-1-1830
Current through Register Vol. 30, No. 50, December 13, 2024
Air that has passed through an abandoned panel or area which is inaccessible for inspection shall not be used to ventilate any active face workings in such mine. No air which has been used to ventilate an area from which the pillars have been removed shall be used to ventilate any active face workings in such mine, except that such air may be used to ventilate enough advancing working places or rooms immediately adjacent to the line of retreat to maintain an orderly sequence of pillars recovery on a set of entries.
Ariz. Admin. Code § R11-1-1830