StacksVerified U.S. regulatory reference

30 CFR §57.22608

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
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.