MSHA - Code of Federal Regulations - 30 CFR 56.7055
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MSHA - Title 30 CFR
30 CFR § 56.7055
Intersecting holes.


Holes shall not be drilled where there is a danger of intersecting a misfired hole or a hole containing explosives blasting agents, or detonators.


[56 FR 46508, Sept. 12, 1991]