MSHA - Code of Federal Regulations - 30 CFR 57.22607
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MSHA - Title 30 CFR
30 CFR § 57.22607
Blasting on shift (III mines).

When blasting on shift, tests for methane shall be made in the mine atmosphere by a competent person before blasting. Blasting shall not be done when 1.0 percent or more methane is present.