30 CFR § 57.22607
Blasting on shift (III mines).
When blasting on shift, tests for methane shall be made in the mine atmosphere by a competent person before blasting. Blasting shall not be done when 1.0 percent or more methane is present.
30 CFR § 57.22607
Blasting on shift (III mines).
When blasting on shift, tests for methane shall be made in the mine atmosphere by a competent person before blasting. Blasting shall not be done when 1.0 percent or more methane is present.
