CFR › Title 30 › Part 57 › §57.2222630 CFR §57.22226Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy linkTests for methane shall be conducted in the mine atmosphere by a competent person—(a)At least once each shift prior to starting work in each face and raise; and(b)Upon initial release of gas into the mine atmosphere from boreholes.