30 CFR Part 57Public Domain
§ 57.22602 — Blasting from the surface (I-C mines)
Subpart T — Safety Standards for Methane in Metal and Nonmetal Mines
(a)All blasting shall be initiated from the surface after all persons are out of the mine and any connecting mines.
(b)Persons shall not enter the mine until a competent person has examined the blast sites and methane concentrations are less than 0.5 percent.
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.