30 CFR Part 57Public Domain
§ 57.22608 — Secondary blasting (I-A, II-A, and V-A mines)
Subpart T — Safety Standards for Methane in Metal and Nonmetal 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.
Public Domain: 30 CFR Part 57 (MSHA Safety and Health Standards — Underground Metal and Nonmetal Mines) is a U.S. government publication and is not subject to copyright. Text extracted from the official source ↗. Figures are served from the eCFR; if one does not load, use the link in its place.