CFR
- Title 1 - General Provisions
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- Title 50 - Wildlife and Fisheries
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.
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