(2) Where uranium is not minedthe complete individual exposure of all mine personnel working in active working areas with radon daughter concentrations in excess of 0.3 WL shall be calculated and recorded. (c) Load end attachment methods using splices are prohibited. (b) Guards shall not be required where the exposed moving parts are at least seven feet away from walking or working surfaces. Persons shall not enter the mine until ventilating air has passed over the blast area and through at least one atmospheric monitoring sensor. 811). 57.12016 Work on electrically-powered equipment. (b) Main facilities used to store explosive material underground shall be. (c) Once loading begins, the only activities permitted within the blast site shall be those activities directly related to the blasting operation and the activities of surveying, stemming, sampling of geology, and reopening of holes, provided that reasonable care is exercised. (b) Storage facilities for the ingredients to be mixed shall provide drainage away from the facilities for leaks and spills. 57.19003 Driving mechanism connections. (2) Automatically deenergize electrical equipment, except power to monitoring equipment determined by MSHA to be intrinsically safe under 30 CFR part 18, and prevent starting such equipment when methane levels reach 1.5 percent. Concrete, masonry block, brick, and steel are examples of noncombustible materials. Attended means presence of an individual or continuous monitoring to prevent unauthorized entry or access. Signaling instructions to hoist operator. Readily visible signs prohibiting smoking and open flames shall be posted where a fire or explosion hazard exists. If any part of a blast is connected in parallel and is to be initiated from powerlines or lighting circuits, the time of current flow shall be limited to a maximum of 25 milliseconds. 57.19073 Hoisting during shift changes. If the main fan is located underground: (i) The cable or conductors supplying power to the fan shall be routed through areas free of fire hazards; or, (ii) The main fan shall be equipped with a second, independent power cable or set of conductors from the surface. Such apparatus shall be approved by MSHA and NIOSH under 42 CFR part 84 and shall be maintained in accordance with manufacturers' specifications. (b) Circular saws and chain saws shall not be equipped with devices which lock-on the operating controls. (1) Posted with warning signs that indicate the contents and are visible from any approach; (2) Used exclusively for the storage of explosive material and necessary equipment associated with explosive material storage and delivery: (i) Portions of the facility used for the storage of explosives shall only contain nonsparking material or equipment. 57.4230 Surface self-propelled equipment. 57.19091 Signaling instructions to hoist operator. (d) The incorporation by reference of these publications is approved by the Director of the Federal Register in accordance with 5 U.S.C. When persons are working in a shaft Men Working in Shaft signs shall be posted at all devices controlling hoisting operations that may endanger such persons. (e) Vehicles used for transportation when examining the mine shall be approved by MSHA under the applicable requirements of 30 CFR parts 18 through 36. 57.22301 Atmospheric monitoring systems (I-A, II-A, and V-A mines). Holes shall not be drilled where there is a danger of intersecting a misfired hole or a hole containing explosives, blasting agents, or detonators. Oxygen cylinders shall not be stored in rooms or areas used or designated for storage of flammable or combustible liquids, including grease. (3) An automatic reverse-activated strobe light may be used at night in lieu of an audible reverse alarm. Company official means a member of the company supervisory or technical staff. 24, 1988]. Lead wires and blasting lines shall be isolated and insulated from power conductors, pipelines, and railroad tracks, and shall be protected from sources of stray or static electricity. Warnings prior to starting or moving equipment. (j) Publications. A fan that controls the entire airflow of an underground mine or the airflow of one of the major air circuits of the mine. 57.22225 Auxiliary equipment stations (I-C mines). When carried on poles supporting powerlines, they shall be installed as specified by the National Electrical Code. 57.19076 Maximum speeds for hoisting persons in buckets. Isolation or insulation of communication conductors. The hardwood or equivalent shall be fastened to the vehicle or conveyance. (b) After blasting, if the monitoring system indicates that methane in the mine is less than 1.0 percent, persons may enter the mine. The record shall contain the name of the person conducting the examination; date of the examination; location of all areas examined; and description of each condition found that may adversely affect the safety or health of miners. (1) If a mine requires additional time to come into compliance with the final DPM limit established in 57.5060 (b) due to technological or economic constraints, the operator of the mine may file an application with the District Manager for a special extension.
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