MSHA - Code of Federal Regulations - 30 CFR 57.22608
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MSHA - Title 30 CFR
30 CFR § 57.22608
Secondary blasting (I-A, II-A, and V-A mines).

Prior to secondary blasting, tests for methane shall be made in the mine atmosphere at blast sites by a competent person. Secondary blasting shall not be done when 0.5 percent or more methane is present.