During performance of an activity underground described in Table C2 or when falling sparks or hot metal from work performed in a shaft, raise, or winze could pose a fire hazard, (a) A multipurpose dry-chemical fire extinguisher shall be at the worksite to supplement the fire extinguishing equipment required by 57.4600; and. Seals shall be provided with a means for checking the quality of air behind the seal and a means to prevent a water head from developing unless the seal is designed to impound water. Pumping equipment and analytical instruments shall be located in intake air. When combinations of cages and skips are used in the same compartment, the cages shall be enclosed to protect personnel from flying material and the hoist speed reduced to man-speed as defined in standard 57.19061, but not to exceed 1,000 feet per minute. (c) When using detonating cord to initiate another explosive, a connection shall be prepared with the detonating cord threaded through, attached securely to, or otherwise in contact with the explosive. (5) Locations of air regulators and stoppings and ventilation doors not shown in paragraph (d) of this standard; (6) Locations of overcasts, undercasts and other airway crossover devices not shown in paragraph (d) of this standard; (8) Locations of known underground mine openings adjacent to the mine; (9) Locations of permanent underground shops, diesel fuel storage depots, oil fuel storage depots, hoist rooms, compressors, battery charging stations and explosive storage facilities. (a) Faces and muck piles shall be examined for misfires after each blasting operation. (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. Design feature means either the manufacturer's original design or a design approved by a registered professional engineer. Explosive material shall not be loaded into blastholes with drill stem equipment or other devices that could be extracted while containing explosive material. (3) Located in areas free of combustible materials or in areas where any exposed combustible materials are coated with one inch of shotcrete, one-half inch of gunite, or other noncombustible material with equivalent fire protection characteristics. Where wet processes are used, drainage shall be maintained, and false floors, platforms, mats, or other dry standing places shall be provided where practicable; and. (1) With an electric arc or with an open flame where an electrically conductive extinguishing agent could create an electrical hazard, a multipurpose dry-chemical fire extinguisher or other extinguisher with at least a 2A:10B:C rating shall be at the worksite. 57.9160 Train movement during shift changes. Gauges and regulators used with oxygen or acetylene cylinders shall be kept clean and free of oil and grease. 57.12007 Junction box connection procedures. A visual check of the completed circuit shall be made to ensure that the components are properly aligned and connected. Safety Practices and Operational Procedures. 57.19068 Orderly conduct in conveyances. Escapeway means a passageway by which persons may leave a mine. Hoisting signal devices shall be positioned within easy reach of persons on the shaft bottom or constantly attended by a person stationed on the lower deck of the sinking platform. 57.6101 Areas around explosive material storage facilities. The Assistant Secretary shall fix a time for filing any objections to the suggested changes and supporting reasons. The controls shall be located so that spills or overruns will not endanger persons. All headframes shall be constructed with suitable design considerations to allow for all dead loads, live loads, and wind loads. At least a 15-foot air gap shall be provided between the blasting circuit and the electric power source. However, a temporary splice may be made to move the equipment for repair. (1) Flame safety lamps shall not be used to test for methane except as supplementary devices. (2) Signs are posted warning that the roadway is not bermed. 29, 2002. Belt, rope, or chains shall not be used to connect driving mechanisms to man hoists. (2) Onsite firefighting equipment for fighting fires beyond their early stages, or the mine shall have made prior arrangements with a local fire department to fight such fires. 57.12023 Guarding electrical connections and resistor grids. (10) Significant changes in the ventilation system projected for one year. Exposure limits for airborne contaminants. (c) Load end attachment methods using splices are prohibited. (3) Diesel equipment shall be shut off or immediately removed from the area. Lightning arrestors shall be connected to a low resistance grounding medium on the surface and shall be separated from neutral grounds by a distance of not less than 25 feet. 57.19108 Posting warning signs during shaft work. Safety device attachments to hoist ropes shall be selected, installed, and maintained according to manufacturers' specifications to minimize internal corrosion and weakening of the hoist rope. (c) The safety catches shall be inspected by a competent person at the beginning of any 24-hour period that the conveyance is to be used. Separation of intake and return air (I-C mines). Torches shall be attended at all times while lit. (a) Before explosive material is transported in hoist conveyances, (1) The hoist operator shall be notified; and. If guide ropes are used in shafts for personnel hoisting applications other than shaft development, the nominal strength (manufacturer's published catalog strength) of the guide rope at installation shall meet the minimum value calculated as follows: Minimum value = Static Load 5.0. Detonator means any device containing a detonating charge that is used to initiate an explosive and includes but is not limited to blasting caps, electric blasting caps and non-electric instantaneous or delay blasting caps. 57.22212 Air flow (I-C, II-A, and V-A mines). Each operator of an underground mine shall establish a check-in and check-out system which shall provide an accurate record of persons in the mine. Ventilation materials (I-A, I-B, I-C, II-A, III, V-A, and V-B mines). (a) A performance drop test of hoist conveyance safety catches shall be made at the time of installation, or prior to installation in a mockup of the actual installation. Equipment shall not be operated in atmospheres containing 1.0 percent or more methane. For the protection of operators of hoists located underground which are part of the mine escape and evacuation plan required under standard 57.11053, the hoist operator shall be provided with a respirable atmosphere completely independent of the mine atmosphere. (c) A raised component must be secured to prevent accidental lowering when persons are working on or around mobile equipment and are exposed to the hazard of accidental lowering of the component. The door shall provide protection at least equivalent to a door constructed of two layers of wood, each a minimum of three-quarters of an inch in thickness. 57.19103 Dumping facilities and loading pockets. This record shall be retained until the rope is retired from service. When auxiliary fan systems are used, such systems shall minimize recirculation and be maintained to provide ventilation air that effectively sweeps the working places. Flammable gas means a gas that will burn in the normal concentrations of oxygen in the air. (b) Hitches and slings used to hoist materials shall be suitable for the particular material handled. Main ventilation failure (I-A, II-A, III, and V-A mines). 57.16002 Bins, hoppers, silos, tanks, and surge piles. Flame safety lamps or other suitable devices shall be used to test for acute oxygen deficiency. Explosive. When any mine is closed, the person in charge shall notify the nearest district office as provided above and indicate whether the closure is temporary or permanent. Activity between machinery or equipment and the highwall or bank. Buckets used to hoist persons during vertical shaft sinking operations shall. 57.19091 Signaling instructions to hoist operator. Within 30 seconds after the warning is given, the conveyor shall be started or a second warning shall be given. (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. (c) When a truck operator cannot clearly recognize the spotter's signals, the truck shall be stopped. If used as an alternative, control doors or bulkheads shall meet the following requirements: (1) Each control door or bulkhead shall be constructed to serve as a barrier to fire, the effects of fire, and air leakage at each opening to the shop. Approved means tested and accepted for a specific purpose by a nationally recognized agency. Operators of self-propelled mobile equipment shall maintain control of the equipment while it is in motion. Mantrips shall be covered if there is danger of persons contacting the trolley wire. The use of loading hose, collar sleeves, or collar pipes is permitted. (6) Type and amount of explosive material. (b) The mine operator or representative of miners may obtain review of the Administrator's determination by filing a request for a hearing with the Assistant Secretary of Labor for Mine Safety and Health, Mine Safety and Health Administration, 201 12th Street South, Arlington, VA 222025452 within 30 days of the Administrator's determination. To prevent injury to personnel, tools and other objects shall not be left loose on the mast or drill platform. Persons shall not ride the bail, rim, bonnet, or crosshead of any shaft conveyance except when necessary for inspection and maintenance, and then only when suitable protection for persons is provided. Main fans shall be maintained according to either the manufacturer's recommendations or a written periodic schedule adopted by the operator which shall be available at the operation on request of the Secretary or his authorized representative. 57.22241 Advance face boreholes (I-C mines). (2) Determined to be free of flammable gases by a flammable gas detection device prior to and at frequent intervals during the application of heat. (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. Auxilary fan means a fan used to deliver air to a working place off the main airstream; generally used with ventilation tubing. Main fan operation and inspection (I-A, II-A, III, and V-A mines). For information on the availability of this material at NARA, call 2027416030, or go to: http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html. Persons shall not enter or leave conveyances which are in motion or after a signal to move the conveyance has been given to the hoistman. 51 FR 36198, Oct. 8, 1986, unless otherwise noted. (d) Nonapproved explosives shall be used only as primers with ammonium nitrate-fuel oil blasting agents. (a) All blasting shall be initiated from the surface after all persons are out of the mine and any connecting mines. (c) Atmospheric monitoring systems shall be checked with a known mixture of methane, and calibrated if necessary at least once every 30 days. Table C1Hydrostatic Test Intervals for Fire Extinguishers. They are divided into the following classes: Class II liquidsthose having flash points at or above 100 F (37.8 C) and below 140 F (60 C). Main fans shall be operated continuously while ore production is in progress. (2) The torque of the first bolt, every tenth bolt, and the last bolt installed in each work area during the shift shall be accurately determined immediately after installation. 57.22220 Air passing unsealed areas (I-A, II-A, III, and V-A mines). Insulation means a dielectric substance offering a high resistance to the passage of current and to a disruptive discharge through the substance. A statement of reasons for the action taken shall be included in the final decision. (c) This standard does not apply to air tuggers of 10 horsepower or less that have only one cable and one drum. Fixed ladders with an inclination of more than 70 degrees from the horizontal shall be offset with substantial landings at least every 30 feet or have landing gates at least every 30 feet. 57.22604 Blasting from the surface (II-B mines). These publications may be obtained from the publishers, the American Society of Mechanical Engineers, 22 Law Drive, P.O. Copies are available at MSHA's Office of Standards, Regulations, and Variances, 201 12th Street South, Arlington, VA 222025452; 2026939440; and at all Metal and Nonmetal Mine Safety and Health District Offices, or available for inspection at the National Archives and Records Administration (NARA). 57.4230 Surface self-propelled equipment. (a) Control doors or bulkheads. Telephone or other voice communication shall be provided between the surface and refuge chambers and such systems shall be independent of the mine power supply. (1) Blasting units shall be approved by MSHA under 30 CFR part 25; or. Underground trailing cables shall be accepted or approved by MSHA as flame resistant. (b) Inspected daily while operating if persons are underground. Before entering a manway where persons may be working or traveling, a warning shall be given by the person entering the manway and acknowledged by any person present in the manway. If any condition listed in paragraph (a) of this section is present, the person conducting the examination shall make a record of the condition and the date. Blasting agent means any substance classified as a blasting agent by the Department of Transportation in 49 CFR 173.114(a) (44 FR 31182, May 31, 1979) which is incorporated by reference. (b) Signs or signals that warn of hazardous conditions shall be placed at appropriate locations at each mine. Signaling instructions to hoist operator.

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