§ 57.22608. Secondary blasting (I-A, II-A, and V-A mines).
35 words·~1 min read·
/us/cfr/t30/s§ 57.22608·A research copy — for the controlling text, always check the official state or federal source. Not legal advice.
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.