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Arizona Administrative Code (Last Updated: November 17, 2016) |
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Title 11. MINES |
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Chapter 1. STATE MINE INSPECTOR |
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Article 18. GASSY MINES |
Section R11-1-1846. Overcasts and undercasts
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Overcasts and undercasts should be:
1. Constructed tightly of incombustible material.
2. Of sufficient strength to withstand possible falls from the back.
3. Kept clear of obstructions.