§57.22601. Blasting from the surface (I-A mines).
30 C.F.R. § 57.22601
All development, production, and bench rounds shall be initiated from the surface after all persons are out of the mine. Persons shall not enter the mine until ventilating air has passed over the blast area and through at least one atmospheric monitoring sensor.
After blasting, if the monitoring system indicates that methane in the mine is less than 1.0 percent, persons may enter the mine. All places blasted shall be tested for methane by a competent person before work is started.
If the monitoring system indicates the presence of 1.0 percent or more methane, persons other than examiners shall not enter the mine until the mine has been examined by a competent person and the methane content has been reduced to less than 1.0 percent.
Vehicles used for transportation when examining the mine shall be approved by MSHA under the applicable requirements of 30 CFR parts 18 through 36.
Notes, amendments, and revision history
Amendments
[52 FR 24941, July 1, 1987, as amended at 53 FR 9615, Mar. 24, 1988]
Authority
Authority: 30 U.S.C. 811.
Source
Source: 52 FR 24941, July 1, 1987, unless otherwise noted.
Authority
Authority: 30 U.S.C. 811.
Source
Source: 50 FR 4082, Jan. 29, 1985, unless otherwise noted.
Amendments
[52 FR 24941, July 1, 1987, as amended at 53 FR 9615, Mar. 24, 1988]