(a) Auxiliary fans, except fans used in shops and other areas which have been so designed that methane cannot enter the airway, shall be approved by MSHA under the applicable requirements of 30 CFR part 18, and be operated so that recirculation is minimized. Main fans shall be operated continuously while ore production is in progress. 57.14160 Mantrip trolley wire hazards underground. Subpart R - Personnel Hoisting ( 57.19000 - 57.19135) Subpart S - Miscellaneous ( 57.20001 - 57.20032) Subpart T - Safety Standards for Methane in Metal and Nonmetal Mines ( 57.22001 - 57.22608) Authority: 30 U.S.C. Annual training provided to potentially exposed miners. Power cables in shafts and boreholes shall be fastened securely in such a manner as to prevent undue strain on the sheath, insulation, or conductors. (a) Self-propelled mobile equipment to be used during a shift shall be inspected by the equipment operator before being placed in operation on that shift. (b) On an annual basis, all persons who go underground shall be instructed in the Mine Safety and Health Administration course contained in Bureau of Mines Instruction Guide 2, MSA W65 Self-Rescuer (March 1972) or Bureau of Mines Instruction Guide 3, Permissible Drager 810 Respirator for Self-Rescue (March 1972). When auxiliary fan systems are used, such systems shall minimize recirculation and be maintained to provide ventilation air that effectively sweeps the working places. Gauges and regulators used with oxygen or acetylene cylinders shall be kept clean and free of oil and grease. Cage doors or gates shall be closed while persons are being hoisted; they shall not be opened until the cage has come to a stop. (b) Explosive material transported in hoist conveyances shall be placed within a container which prevents shifting of the cargo that could cause detonation of the container by impact or by sparks. (b) This standard does not apply to installed wiring or timber that is coated with at least one inch of shotcrete, one-half inch of gunite, or other noncombustible materials with equivalent fire protection characteristics. Trolley and trolley feeder wire shall be installed opposite the clearance side of haulageways. Berm means a pile or mound of material along an elevated roadway capable of moderating or limiting the force of a vehicle in order to impede the vehicle's passage over the bank of the roadway. 57.19076 Maximum speeds for hoisting persons in buckets. Personal electric lamps (I-A, I-B, I-C, II-A, II-B, III, IV, V-A, and V-B mines). 57.22103 Open flames (I-A, II-A, III, and V-A mines). Asbestos is a generic term for a number of asbestiform hydrated silicates that, when crushed or processed, separate into flexible fibers made up of fibrils. Otherwise, it is, within the purpose of this definition, uninsulated. All blasting lines shall be insulated and kept in good repair. The final decision shall be served upon the mine operator and representative of the miners. Blowout means a sudden, violent, release of gas or liquid due to the reservoir pressure in a petroleum mine. When a manually operated hoist is used, a qualified hoistman shall remain within hearing of the telephone or signal device at all times while any person is underground. (a) Fire alarm systems capable of promptly warning every person underground, except as provided in paragraph (b), shall be provided and maintained in operating condition. Moving conveyors shall be crossed only at designated crossover points. Explosives, blasting agents, and detonators. (2) Isolate any combustible material with noncombustible material. Categories and subcategories are defined as follows: (1) Category I applies to mines that operate within a combustible ore body and either liberate methane or have the potential to liberate methane based on the history of the mine or the geological area in which the mine is located. Damaged, loosened, or dislodged timber use for ground support which creates a hazard to persons shall be repaired or replaced prior to any work or travel in the affected area. Secondary blasting (I-A, II-A, and V-A mines). 57.14109 Unguarded conveyors with adjacent travelways. When a drill is being moved from one drilling area to another, drill steel, tools, and other equipment shall be secured and the mast placed in a safe position. Certifications of tests shall be retained for at least one year and made available to authorized representatives of the Secretary. 50 FR 4082, Jan. 29, 1985, unless otherwise noted. (a) The Administrator's determination of category or subcategory placement or change in placement shall become final upon the 30th day after it is served on the mine operator and representative of miners, unless a request for a hearing has been filed. Exposed surfaces on the fresh air side of seals constructed of combustible materials shall be coated with at least one inch of construction plaster containing perlite and gypsum; at least one inch of expanded vermiculite, Portland cement and limestone; or other coatings with equivalent fire resistance. (b) Fixtures and accessories not addressed in ASTM F43295 may be used for ground support provided they, (1) Have been successful in supporting the ground in an area with similar strata, opening dimensions and ground stresses in any mine; or. If the ROPS is subjected to a roll-over or abnormal structural loading, the equipment manufacturer or a registered professional engineer with knowledge and experience in ROPS design shall recertify that the ROPS meets the applicable performance requirements before it is returned to service. Horns and backup alarms for surface equipment. (1) Be accomplished by a main fan.
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