Certification of calibration tests shall be made by signature and date. (3) Any group of containers used for storage of more than 60 gallons of flammable or combustible liquids. Trailing cable and power-cable connections to junction boxes shall not be made or broken under load. (2) Only development related to making a primary ventilation connection may be performed beyond 250 feet of the shaft. Employer means a person or organization which hires one or more persons to work for wages or salary. Chapter I Mine Safety and Health Administration, Department of Labor; . (2) Not be modified, in a manner that obscures visibility necessary for safe operation. Unless platforms or safety lines are used, persons shall not position themselves over drawholes if there is danger that broken rock or material may be withdrawn or bridged. The plan shall include: (a) Mine maps or diagrams showing directions of principal air flow, location of escape routes and locations of existing telephones, primary fans, primary fan controls, fire doors, ventilation doors, and refuge chambers. 57.4462 Storage of combustible liquids underground. 57.6905 Protection of explosive material. (d) The plan shall be available to an authorized representative of the Secretary and to miners or their representatives. These investigations may include an evaluation of the following: (1) Source, nature, and extent of occurrences; (2) Conditions under which the incident occurred; (4) Physical conditions at the time of the occurrence; (5) Charts, logs, and records related to the occurrence; (6) Whether the occurrence is isolated, continuous, or could recur; (7) Conditions indicating that the hazards of methane no longer exist or exist under circumstances more appropriately governed by a different category or subcategory; (8) The geology of the mine and the geological area in which the mine is located; and. 57.13010 Reciprocating-type air compressors. If failure of a water or silt retaining dam will create a hazard, it shall be of substantial construction and inspected at regular intervals. Substantial construction means construction of such strength, material, and workmanship that the object will withstand all reasonable shock, wear, and usage to which it will be subjected. All mines shall be ventilated mechanically. Main fan operation and inspection (I-A, II-A, III, and V-A mines). 57.16001 Stacking and storage of materials. Rock burst does not include a burst resulting from pressurized mine gases. (a) For drum end attachment, wire rope shall be attached. Hoist means a power driven windlass or drum used for raising ore, rock, or other material from a mine, and for lowering or raising persons and material. Title 30 was last amended 4/20/2023. 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. (a) For 30 minutes if safety fuse and blasting caps are used; (b) For 15 minutes if any other type detonators are used; or. Flash point means the minimum temperature at which sufficient vapor is released by a liquid or solid to form a flammable vapor-air mixture at atmospheric pressure. (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. Portable rigid ladders shall be provided with suitable bases and placed securely when used. Electric BlastingSurface and Underground. This content is from the eCFR and may include recent changes applied to the CFR. 57.18013 Emergency communications system. 57.12005 Protection of power conductors from mobile equipment. (6) Type and amount of explosive material. 57.19017 Emergency braking for electric hoists. (3) Aluminum alloy fan blades shall not contain more than 0.5 percent magnesium. [50 FR 4082, Jan. 29, 1985, as amended at 60 FR 30400, June 8, 1995; 60 FR 33723, June 29, 1995; 60 FR 35695, July 11, 1995; 71 FR 16667, Apr. (c) If methane reaches 1.0 percent at a work place and there has been a failure of the main ventilation system, all persons shall be withdrawn from the mine. (b) Operators should also be aware of regulations affecting storage facilities in 27 CFR part 55, in particular, 27 CFR 55.218 and 55.220. Illumination sufficient to provide safe working conditions shall be provided in and on all surface structures, paths, walkways, stairways, switch panels, loading and dumping sites, and working areas. Appendix I to Subpart C of Part 57National Consensus Standards, Subpart DAir Quality, Radiation, Physical Agents, and Diesel Particulate Matter. Barricaded means obstructed to prevent the passage of persons, vehicles, or flying materials. (2) Provided with an air lock when passage through the fan bulkhead is necessary. (a) Operators of mines which have experienced a rock burst shall. 57.12016 Work on electrically-powered equipment. Intoxicating beverages and narcotics shall not be permitted or used in or around mines. Battery charging stations, compressor stations, pump stations, and transformer stations shall be installed in intake air at locations which are sufficiently ventilated to prevent the accumulation of methane. [52 FR 24941, July 1, 1987; 52 FR 27903, July 24, 1987, as amended at 67 FR 38385, June 4, 2002; 80 FR 52988, Sept. 2, 2015]. At installation, the nominal strength (manufacturer's published catalog strength) of wire ropes used for hoisting shall meet the minimum rope strength values obtained by the following formulas in which L equals the maximum suspended rope length in feet: (a) Winding drum ropes (all constructions, including rotation resistant). Hoistmen shall be informed when persons are working in a compartment affected by that hoisting operation and a Men Working in Shaft sign shall be posted at the hoist. A unit, package, or cartridge of explosives which contains a detonator and is used to initiate other explosives or blasting agents. Storage of flammable liquids underground. Examples of detonators are blasting caps, electric or non-electric instantaneous or delay blasting caps and delay connectors. (4) Whenever an operator ceases to do business, that operator must transfer all records required to be maintained by this part, or a copy thereof, to any successor operator who must maintain them for the required period.
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