§ 45.1-161.290. Penetration of underground mines; testing.
A. A qualified person shall test for methane and deficiency of oxygen using an approved device at the entrance to an auger hole or highwall miner entry when either penetrates a worked-out area of an underground mine.
B. If one percent or more of methane is detected or 19.5 percent or less of oxygen is found to exist no further work shall be performed until the atmosphere has been made safe.
1994, c. 28; 1999, c. 256; 2011, cc. 826, 862.