30 CFR Part 57Public Domain
§ 57.22226 — Testing for methane (IV mines)
Subpart T — Safety Standards for Methane in Metal and Nonmetal Mines
Tests 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.
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.