(1) All underground mines shall be worked exclusively by the use of approved electric lamps for personal lighting.
(2) A mine operator shall provide an MSHA-approved, handheld, multigas detector that can measure methane, oxygen, and carbon monoxide to each group of two (2) or more miners working in close proximity of each other underground, the foreman, fireboss, and to each person who works alone, such as pumpers, examiners, and outby miners. The mine operator shall make available one (1) multigas detector at the working face for use by any miner working on the section. Miners shall be trained in the proper use and calibration of the multigas detectors and shall document that the training has been provided. Signs shall be prominently posted at places miners gather with instructions on the proper use of multi-gas detectors.
(3) No person shall at any time carry into any mine any intoxicants. No person shall at any time enter any underground mine with matches, lighters, pipes, cigars, cigarettes, or any device for making lights or fire not authorized or approved, including but not limited to electronic cigarettes, cigars, or any component that heats liquids or other material to produce vapor. The licensee shall at frequent intervals search, or cause to be searched, any person entering or about to enter the mine or inside the mine, to prevent the person from taking, carrying, or using the articles therein.