30 CFR 57.22608 - Secondary blasting (I-A, II-A, and V-A mines).

U.S. Code of Federal Regulations

Regulations most recently checked for updates: Aug 28, 2025

View all text of Subpart T [§ 57.22001 - § 57.22608]

§ 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.