(c) Employees shall be withdrawn from areas where there is present an airborne contaminant given a C designation by the Conference and the concentration exceeds the threshold limit value listed for that contaminant. (2) The Assistant Secretary shall promptly notify the Administrative Law Judge of a discretionary review or an appeal. A switch that provides shunt protection in blasting circuits between the blast site and the switch used to connect a power source to the blasting circuit. Where restricted clearance creates a hazard to persons on mobile equipment, warning devices shall be installed in advance of the restricted area and the restricted area shall be conspicuously marked. 57.19110 Overhead protection for shaft deepening work. 57.9202 Loading and hauling large rocks. Main ventilation failure (I-A, II-A, III, and V-A mines). 29, 2002. 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. 57.19080 Hoisting tools, timbers, and other materials. 57.19008 Friction hoist synchronizing mechanisms. Insulated means separated from other conducting surfaces by a dielectric substance permanently offering a high resistance to the passage of current and to disruptive discharge through the substance. (a) Areas within 25 feet of the following shall be free of combustible materials: (2) Unburied, combustible liquid storage tanks. Notice and appeal of placement or change in placement. Potable water means water which shall meet the applicable minimum health requirements for drinking water established by the State or community in which the mine is located or by the Environmental Protection Agency in 40 CFR part 141, pages 169182 revised as of July 1, 1977. Shaft means a vertical or inclined shaft, a slope, incline, or winze. 1 year after date any equipment is tagged. If you would like to comment on the current content, please use the 'Content Feedback' button below for instructions on contacting the issuing agency. Distribution boxes shall be provided with a disconnecting device for each branch circuit. If you have comments or suggestions on how to improve the www.ecfr.gov website or have questions about using www.ecfr.gov, please choose the 'Website Feedback' button below. (1) Ample warning shall be given to allow all persons to be evacuated; (2) Clear exit routes shall be provided for persons firing the round; and. Escapeway means a passageway by which persons may leave a mine. (e) Between cars of trains, on the leading end of trains, on the leading end of a single railcar, or in other locations on trains that expose persons to hazards from train movement. The self-contained breathing system shall provide a minimum of 24 hours of respirable atmosphere to the hoist operator. Ground support shall be used where ground conditions, or mining experience in similar ground conditions in the mine, indicate that it is necessary. 704. (10) Significant changes in the ventilation system projected for one year. No person shall operate a hoist unless within the preceding 12 months he has had a medical examination by a qualified, licensed physician who shall certify his fitness to perform this duty. (b) All piping, valves, and fittings shall be. The instruction shall be given by MSHA personnel or by persons who are certified by the District Manager of the area in which the mine is located. (1) Within twenty four hours report to the nearest MSHA office each rock burst which: (iv) Disrupts mining activity for more than one hour. Explosives are substances classified as explosives by the Department of Transportation in 173.53, 173.88, and 173.100 of Title 49 of the Code of Federal Regulations (1986 Edition). ( 1) Hoisting of the personnel platform must be performed in a slow, controlled, cautious manner, with no sudden movements of the equipment or the platform. Hoists: . (b) Defects on any equipment, machinery, and tools that affect safety shall be corrected in a timely manner to prevent the creation of a hazard to persons. (a) All development, production, and bench rounds shall be initiated from the surface after all persons are out of the mine. The controls shall be located so that spills or overruns will not endanger persons. L. 91173 as amended by Pub. A container of not over five gallons capacity that is designed to safely relieve internal pressure when exposed to heat and has a spring-closing lid and spout cover. An application must include the following information: (i) Documentation supporting that controls are technologically or economically infeasible at this time to reduce the miner's exposure to the final DPM limit. This content is from the eCFR and may include recent changes applied to the CFR. The potential on bare signal wires accessible to contact by persons shall not exceed 48 volts. Vents shall be installed so that forces are directed away from persons should an explosion occur. (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. (6) The miner must be reevaluated when the mine operator has reason to believe that conditions have changed which could adversely affect the miner's ability to wear the respirator. (1) Constructed of nonsparking material on the inside when used for the storage of explosives; (2) Kept clean, suitably dry, and orderly; (4) Located out of the line of blasts so they will not be subjected to damaging shock or flyrock; (5) Identified with warning signs or coded to indicate the contents with markings visible from any approach; (6) Located at least 15 feet from all haulageways and electrical equipment, or placed entirely within a mined-out recess in the rib used exclusively for explosive material; (7) Filled with no more than a one-week supply of explosive material; (8) Separated by at least 25 feet from other facilities used to store detonators; and. Construction and maintenance of ventilation doors. (a) At least once every twelve months, all persons who work underground shall be instructed in the escape and evacuation plans and procedures and fire warning signals in effect at the mine. The Mine Act gives the Secretary of Labor authority to develop, promulgate, and revise health or safety standards for the protection of life and prevention of injuries in the nation's mines. (b) In the event of auxiliary fan failure due to malfunction, accident, power failure, or other such unplanned or unscheduled event: (1) The air quality in the affected active workings shall be tested at least within 2 hours of the discovery of the fan failure, and at least every 4 hours thereafter by a competent person for compliance with the requirements of the applicable standards of subpart D of this part until normal ventilation is restored, or. Wood, paper, rubber, and plastics are examples of combustible materials. 57.12026 Grounding transformer and switchgear enclosures. Any substance classified as a blasting agent by the Department of Transportation in 49 CFR 173.114a(a). The ends of such conduit or pipe shall be sealed to prevent entry of explosive gas or dust. Subpart TSafety Standards for Methane in Metal and Nonmetal Mines, Title 49 of the Code of Federal Regulations. A plan of the mine ventilation system shall be set out by the operator in written form. Actions at 2.0 percent methane (IV mines). (a) Detonators and explosives shall be stored in magazines. (8) The mine operator must maintain a record of the identity of the PLHCP and the most recent written determination of each miner's ability to wear a respirator for the duration of the miner's employment plus six months. 61 FR 36801, July 12, 1996, unless otherwise noted. Water or neutralizing agents shall be available where corrosive chemicals or other harmful substances are stored, handled, or used. At least a 15-foot air gap shall be provided between the blasting circuit and the electric power source. If you have questions or comments regarding a published document please Following evacuation of a mine in a fire emergency, only persons wearing and trained in the use of mine rescue apparatus shall participate in rescue and firefighting operations in advance of the fresh air base. 57.12039 Protection of surplus trailing cables. (7) At least 25 feet from detonator storage facilities. This independent ventilation system shall convert, without contamination, to an approved and properly maintained 2-hour self-contained breathing apparatus to provide a safe means of escape for the hoist operator after the hoisting duties have been completed as prescribed in the mine escape and evacuation plan for that hoist. Service of a request for hearing is completed upon mailing by registered or certified mail, return receipt requested. (2) Conditions noted by the person conducting the examination that may present an imminent danger shall be brought to the immediate attention of the operator who shall withdraw all persons from the area affected (except persons referred to in section 104(c) of the Federal Mine Safety and Health Act of 1977) until the danger is abated. 57.11025 Railed landings, backguards, and other protection for fixed ladders. General RequirementsSurface and Underground. The valve shall be closed except when the equipment is being operated. ROPS shall have a label permanently affixed to the structure identifying. Initiation systems shall be used in accordance with the manufacturer's instructions. 3. Overhead high-potential powerlines shall be installed as specified by the National Electrical Code. Actions at 1.0 percent methane (I-C, II-A, II-B, and IV mines). (d) Records of all instruction shall be kept at the mine site or nearest mine office at least 2 years from the date of instruction. (b) If methane reaches 1.0 percent at a main exhaust fan, electrical power underground shall be deenergized, except power to monitoring equipment determined by MSHA to be intrinsically safe under 30 CFR part 18, and all persons shall be withdrawn from the mine. (a) All development, production, and bench rounds shall be initiated from the surface after all persons are out of the mine. The term evidence means visible smoke or odor that is unusual for that piece of equipment under normal operating procedures, or obvious or visible defects in the exhaust emissions control system or in the engine affecting emissions. (3) Any group of containers used for storage of more than 60 gallons of flammable or combustible liquids. (c) When respiratory protection is used in atmospheres immediately harmful to life, the presence of at least one other person with backup equipment and rescue capability shall be required in the event of failure of the respiratory equipment. 50 FR 4082, Jan. 29, 1985, unless otherwise noted. Safety fuse means a flexible cord containing an internal burning medium by which fire is conveyed at a continuous and uniform rate for the purpose of firing blasting caps or a black powder charge. [This interim permissible exposure limit (PEL) remains in effect until the final DPM exposure limit becomes effective. Mine operators must give prior notice to affected miners and their representatives of the date and time of intended monitoring. (b) Metal magazines shall be equipped with electrical bonding connections between all conductive portions so the entire structure is at the same electrical potential. 57.22228 Preshift examination (I-A, I-C, 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. (a) Uniform fittings or readily available adapters for onsite firefighting equipment; (b) Readily available wrenches or keys to open the valves; and. (2) Strategically located, readily accessible, plainly marked, and maintained in fire-ready condition. Electric auxiliary fans shall be approved by MSHA under the applicable requirements of 30 CFR part 18. Telegraph, telephone, or signal wires shall not be installed on the same crossarm with power conductors. (b) The train operator, when present, is notified and the notice acknowledged. [50 FR 4082, Jan. 29, 1985, as amended at 68 FR 32361, May 30, 2003; 69 FR 38842, June 29, 2004]. Circuits shall be protected against excessive overloads by fuses or circuit breakers of the correct type and capacity. [61 FR 36801, July 12, 1996, as amended at 67 FR 38385, June 4, 2002; 68 FR 32361, May 30, 2003; 69 FR 38842, June 29, 2004; 85 FR 2027, Jan. 14, 2020]. When persons are working at the mine, a competent person designated by the mine operator shall be in attendance to take charge in case of an emergency. A bucket shall be stabilized before a hoisting signal is given to continue hoisting the bucket to the crosshead. (2) Have been tested and shown to be effective in supporting ground in an area of the affected mine which has similar strata, opening dimensions, and ground stresses as the area where the fixtures are expected to be used. Procedures for inspection, testing, and maintenance. More than 10 pounds of combustible plastics. (h) At least two persons shall be present when lighting safety fuse, and no one shall light more than 15 individual fuses. 53 FR 32528, Aug. 25, 1988, unless otherwise noted. Until the corrective action is completed. This standard does not apply to diesel-powered equipment. The publication may be examined at any Metal and Nonmetal Mine Safety and Health District Office of the Mine Safety and Health Administration. (c) Certification of examinations shall be made by signature and date. 57.22221 Overcast and undercast construction (I-A, II-A, III, and V-A mines). Belt, rope, or chains shall not be used to connect driving mechanisms to man hoists. 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. Access to unattended mine openings shall be restricted by gates or doors, or the openings shall be fenced and posted. The alternative used shall at all times provide at least the same degree of safety as control doors or bulkheads. (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. (1) The materials being hoisted must be rigged to prevent unintentional displacement. (2) Upon request from an authorized representative of the Secretary of Labor, the Secretary of Health and Human Services, or from the authorized representative of miners, mine operators must promptly provide access to any record listed in the table in this section. 57.19076 Maximum speeds for hoisting persons in buckets. (a) Be securely attached to a crosshead when traveling in either direction between the lower and upper crosshead parking locations; (b) Have overhead protection when the shaft depth exceeds 50 feet; (c) Have sufficient depth or a suitably designed platform to transport persons safely in a standing position; and. (b) All welding operations shall be well-ventilated. The Administrator for Metal and Nonmetal Mine Safety and Health (Administrator) shall be responsible for category and subcategory placement, change in placement, and notification of placement of mines. Category V is divided into Subcategories V-A and V-B as follows: (i) Subcategory V-A applies to petroleum mines that operate entirely or partially within an oil reservoir; and all other petroleum mines in which, (ii) Subcategory V-B applies to petroleum mines that operate outside of and drill into an oil reservoir and in which. Protection for openings around travelways. Only authorized persons shall be in hoist rooms. Tools or materials shall not be carried on top of locomotives underground except for secured rerailing devices located in a manner which does not create a hazard to persons. Detonating cord means a flexible cord containing a solid core of high explosives. A means of ventilating faces shall be provided before workings are abandoned in unsealed areas, unless crosscuts are provided within 30 feet of the face. (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; and. Protection against radon gas shall be provided by supplied air devices or by face masks containing absorbent material capable of removing both the radon and its daughters. 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. (a) Waste materials, including liquids, shall not accumulate in quantities that could create a fire hazard. (a) A miner's personal exposure to diesel particulate matter (DPM) in an underground mine must not exceed an average eight-hour equivalent full shift airborne concentration of 308 micrograms of elemental carbon per cubic meter of air (308EC g/m3). 57.12050 Installation of trolley wires. Detonators may be either Class A detonators or Class C detonators, as classified by the Department of Transportation in 49 CFR 173.53 and 173.100, which is available at any MSHA Metal and Nonmetal Safety and Health district office. These records shall include the individual's time in each active working area and the concentrations of airborne radon daughters for each active working area. Authorized person means a person approved or assigned by mine management to perform a specific type of duty or duties or to be at a specific location or locations in the mine. (d) At the completion of each examination required by paragraph (a) of this section, the person making the examination shall certify, by signature and date, that the examination has been made. It may be examined at any Metal and Nonmetal Mine Safety and Health District Office of the Mine Safety and Health Administration, and may be obtained from the publisher, the National Board of Boiler and Pressure Vessel Inspectors, 1055 Crupper Avenue, Columbus, Ohio 43229. (e) Plastic tubes shall not be used as hole liners if the hole contains an electric detonator. Safe means of access shall be provided and maintained to all working places. A manually operated device shall be installed on each electric hoist that will allow the conveyance or counterbalance to be removed from an overtravel position. Fire protection shall be provided at the head, tail, drive, and take-up pulleys of underground belt conveyors. 57.22205 Doors on main fans (I-A, II-A, III, and V-A mines). (2) Signs are posted warning that the roadway is not bermed. Only experienced hoistmen shall operate the hoist except in cases of emergency and in the training of new hoistmen. Pressure-relief systems including vents, or explosion suppression systems, shall be provided on explosive dust handling and processing equipment and on facilities housing such equipment. Class IIIA liquidsthose having flash points at or above 140 F (60 C) and below 200 F (93.4 C). Secondary safety connection means a second connection between a conveyance and rope, intended to prevent the conveyance from running away or falling in the event the primary connection fails. Guarding trolley wires and bare powerlines. 57.18002 Examination of working places. (ii) Increases in wages of the transferred miner must be based upon the new work classification. Shafts that have not been inspected within the past 7 days shall not be used until an inspection has been conducted by a competent person. This can be accomplished by incorporating an arcing control device in the blasting circuit or by interrupting the circuit with an explosive device attached to one or both lead lines and initiated by a 25-millisecond delay electric detonator. 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. (c) Where flyrock might damage exposed safety fuse, the blast shall be timed so that all safety fuses are burning within the blastholes before any blasthole detonates. Fire resistance rating means the time, in minutes or hours, that an assembly of materials will retain its protective characteristics or structural integrity upon exposure to fire. 57.19069 Entering and leaving conveyances. MSHA's standard does not define protective footwear. Air in all active workings shall contain at least 19.5 volume percent oxygen. If methane reaches 1.0 percent in the mine atmosphere, all persons other than competent persons necessary to make ventilation changes shall be withdrawn from affected areas until methane is reduced to less than 0.5 percent. (a) An adequate supply of potable drinking water shall be provided at all active working areas. 552(a) and 1 CFR part 51. Suitable warning shall be given before molten metal is poured and before a container of molten metal is moved. Suitable danger signs shall be posted at all major electrical installations. The term also is used to describe the explosive material itself that has failed to detonate. No welding or cutting shall be performed on a bulk delivery vehicle until the vehicle has been washed down and all explosive material has been removed. If filing by mail or fax, completed printed forms should be sent to: MSHA Qualification and Certification P.O. (a) If electric blasting includes the use of branch circuits, each branch shall be equipped with a safety switch or equivalent method to isolate the circuits to be used. 57.22241 Advance face boreholes (I-C mines). 8. Inspection and cover plates on electrical equipment and junction boxes shall be kept in place at all times except during testing or repairs. Combustible material means a material that, in the form in which it is used and under the conditions anticipated, will ignite, burn, support combustion or release flammable vapors when subjected to fire or heat. (c) Any place where the train operator's vision is obscured. To prevent accidental release of gases from hoses and torches attached to oxygen and acetylene cylinders or to manifold systems, cylinder or manifold system valves shall be closed when, (b) The torch and hoses are left unattended; or. All seals, and those stoppings that separate main intake from main return airways, shall be of substantial construction and constructed of noncombustible materials, except that stoppings constructed of brattice materials may be used in face areas. (2) The reasons for placement or change in placement; (4) The applicable standards and a time schedule for the mine operator to achieve compliance; (5) Whether or not conditions encountered during primary or access development are transient or permanent; and. (e) For Subcategory I-A mines only: Main exhaust fans shall be equipped with methane monitors to give an alarm when methane in the return air reaches 0.5 percent. Explosive. 57.19006 Automatic hoist braking devices. (2) Combustible liquids in closed containers. Travelway. Explosive material. Operator-carrying overhead cranes shall be provided with. Cables shall enter metal frames of motors, splice boxes, and electrical compartments only through proper fittings. Breakthrough holes shall be stemmed at both ends. Scientists take part in drafting laws, government regulations and parliamentary hearings on law enforcement matters. Mines shall operate in accordance with the applicable standards in this subpart to protect persons against the hazards of methane gas and dust containing volatile matter. (2) Blasting units used to fire more than 20 detonators shall provide at least 2 amperes through each detonator but not more than an average of 100 amperes through one ohm for 10 milliseconds, and provide the necessary current for at least the first 5 milliseconds with a cutoff not to exceed 10 milliseconds. (1) Self-propelled mobile equipment shall be equipped with a service brake system capable of stopping and holding the equipment with its typical load on the maximum grade it travels. MSHA will accept such a certifying statement annually, without regard to format, if it is made available at the time of inspection. (2) Only development related to making a primary ventilation connection may be performed beyond 250 feet of the shaft. Electrical distribution circuits within 50 feet of electric detonators at the blast site shall be deenergized. (a) Drained, ventilated, and thoroughly cleaned of any residue; (b) Vented to prevent pressure build-up during the application of heat; and, (1) Filled with an inert gas or water, where compatible; or. (c) A person shall attend the belt at the drive pulley when it is necessary to operate the conveyor while temporarily bypassing the automatic function. While the request for category or subcategory reassignment is pending, the mine shall continue to operate under the standards for the category or subcategory to which originally assigned. Manual material handling (MMH) is the process of routinely moving and handling objects by carrying, holding, lifting, pulling, pushing, and stooping. Diesel equipment shall be shut off or immediately removed from the affected area; and. (e) Blasting caps shall be crimped to fuse only with implements designed for that purpose. 57.12016 Work on electrically-powered equipment. Hoist conveyance connections shall be inspected at least once during any 24-hour period that the conveyance is used for hoisting persons. Category placement or change in placement. 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). 57.22237 Actions at 2.0 to 2.5 percent methane in bleeder systems (I-A and III mines). (1) Service brake tests shall be conducted on surface-operated equipment at underground mines when an MSHA inspector has reasonable cause to believe that the service brake system does not function as required, unless the mine operator removes the equipment from service for the appropriate repair; (2) The performance of the service brakes shall be evaluated according to Table M1. 57.19108 Posting warning signs during shaft work. 57.19068 Orderly conduct in conveyances. (2) 200 feet of an unsurveyed abandoned mine or abandoned workings which cannot be inspected. Track cable connections shall not obstruct the passage of carriage wheels. Section 75.1400 (e) requires that when persons are transported into or out of a mine by a hoist, a qualified hoisting engineer shall be on duty while any person is underground. ANSI N13.81973 may be examined at any Metal and Nonmetal Mine Safety and Health District Office of the Mine Safety and Health Administration, and may be obtained from the American National Standards Institute, Inc., at 25 W. 43rd Street, 4th Floor, New York, NY 10036; http://www.ansi.org. (b) If the destruction of any bulkhead on an inactive level would allow fire contaminants to reach an escapeway, that bulkhead shall be constructed and maintained to provide at least the same protection as required for control doors under Table C3. An explosive mixture of dust containing volatile matter is 0.02 ounce or more per cubic foot of air. (a) Except as provided in paragraph (b), the exposure to airborne contaminants shall not exceed, on the basis of a time weighted average, the threshold limit values adopted by the American Conference of Governmental Industrial Hygienists, as set forth and explained in the 1973 edition of the Conference's publication, entitled TLV's Threshold Limit Values for Chemical Substances in Workroom Air Adopted by ACGIH for 1973, pages 1 through 54, which are hereby incorporated by reference and made a part hereof. Electrical conductors shall be of a sufficient size and current-carrying capacity to ensure that a rise in temperature resulting from normal operations will not damage the insulating materials. [66 FR 5907, Jan. 19, 2001, as amended at 67 FR 9184, Feb. 27, 2002]. (2) Provide any enclosed screw-type conveyors with protection against internal pressure and frictional heat. Ladderways constructed after November 15, 1979, shall have a minimum unobstructed cross-sectional opening of 24 inches by 24 inches measured from the face of the ladder. Control door that serves as a barrier to the effects of fire and air leakage. 57.19076 Maximum speeds for hoisting persons in buckets. The requirements of this standard apply to underground areas only.

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