StacksVerified U.S. regulatory reference

30 CFR §57.22602

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)All blasting shall be initiated from the surface after all persons are out of the mine and any connecting mines.
  2. (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.