§ 57.22608 Secondary blasting (I-A, II-A, and V-A mines).
30 CFR 57.22608
Citation30 CFR 57.22608
CorpusDaily eCFR
Displayed edition2026-09-10
Last updated2026-09-10
§ 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.