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This part 56 sets forth mandatory safety and health standards for each surface metal or nonmetal mine, including open pit mines, subject to the Federal Mine Safety and Health Act of 1977. The purpose of these standards is the protection of life, the promotion of health and safety, and the prevention of accidents.
The following definitions apply in this part. In addition definitions contained in any subpart of part 56 apply in that subpart. If inconsistent with the general definitions in this section, the definition in the subpart will apply in that subpart:
American Table of Distances means the current edition of “The American Table of Distances for Storage of Explosives” published by the Institute of Makers of Explosives.
Approved means tested and accepted for a specific purpose by a nationally recognized agency.
Attended means presence of an individual or continuous monitoring to prevent unauthorized entry or access.
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.
Barricaded means obstructed to prevent the passage of persons, vehicles, or flying materials.
Barrier means a material object, or objects that separates, keeps apart, or demarcates in a conspicuous manner such as cones, a warning sign, or tape.
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.
Blast area means the area in which concussion (shock wave), flying material, or gases from an explosion may cause injury to persons. In determining the blast area, the following factors shall be considered:
(1) Geology or material to be blasted.
(2) Blast pattern.
(3) Burden, depth, diameter, and angle of the holes.
(4) Blasting experience of the mine.
(5) Delay system, powder factor, and pounds per delay.
(6) Type and amount of explosive material.
(7) Type and amount of stemming.
Blast site means the area where explosive material is handled during loading, including the perimeter formed by the loaded blastholes and 50 feet (15.2 meters) in all directions from loaded holes. A minimum distance of 30 feet (9.1 meters) may replace the 50-foot (15.2-meter) requirement if the perimeter of loaded holes is demarcated with a barrier. The 50-foot (15.2-meter) and alternative 30-foot (9.1-meter) requirement also apply in all directions along the full depth of the hole.
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. This document is available for inspection at each Metal and Nonmetal Safety and Health District Office of the Mine Safety and Health Administration, and may be obtained from the U.S. Government Printing Office, Washington, DC 20402.
Blasting area means the area near the blasting operations in which concussion or flying material can reasonably be expected to cause injury.
Blasting cap means a detonator which is initiated by a safety fuse.
Blasting circuit means the electrical circuit used to fire one or more electric blasting caps.
Blasting switch means a switch used to connect a power source to a blasting circuit.
Booster means any unit of explosive or blasting agent used for the purpose of perpetuating or intensifying an initial detonation.
Capped fuse means a length of safety fuse to which a blasting cap has been attached.
Capped primer means a package or cartridge of explosives which is specifically designed to transmit detonation to other explosives and which contains a detonator.
Circuit breaker means a device designed to open and close a circuit by nonautomatic means and to open the circuit automatically on a predetermined overcurrent setting without injury to itself when properly applied within its rating.
Combustible means capable of being ignited and consumed by fire.
Combustible liquids means liquids having a flash point at or above 100 °F (37.8 °C). They are divided into the following classes:
(1) Class II liquids—those having flash points at or above 100 °F (37.8 °C) and below 140 °F (60 °C).
(2) Class IIIA liquids—those having flash points at or above 140 °F (60 °C) and below 200 °F (93.4 °C).
(3) Class IIIB liquids—those having flash points at or above 200 °F (93.4 °C).
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. Wood, paper, rubber, and plastics are examples of combustible materials.
Company official means a member of the company supervisory or technical staff.
Competent person means a person having abilities and experience that fully qualify him to perform the duty to which he is assigned.
Conductor means a material, usually in the form of a wire, cable, or bus bar, capable of carrying an electric current.
Delay connector means a non-electric short interval delay device for use in delaying blasts which are initiated by detonating cord.
Detonating cord means a flexible cord containing a solid core of high explosives.
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 nonelectric instantaneous or delay blasting caps.
Distribution box means a portable apparatus with an enclosure through which an electric circuit is carried to one or more cables from a single incoming feed line, each cable circuit being connected through individual overcurrent protective devices.
Electric blasting cap means a detonator designed for and capable of being initiated by means of an electric current.
Electrical grounding means to connect with the ground to make the earth part of the circuit.
Employee means a person who works for wages or salary in the service of an employer.
Employer means a person or organization which hires one or more persons to work for wages or salary.
Emulsion means an explosive material containing substantial amounts of oxidizers dissolved in water droplets, surrounded by an immiscible fuel.
Explosive means any substance classified as an explosive by the Department of Transportation in 49 CFR 173.53, 173.88, and 173.100 which are incorporated by reference. Title 49 CFR is available for inspection at each Metal and Nonmetal Safety and Health district office of the Mine Safety and Health Administration, and may be obtained from the U.S. Government Printing Office, Washington, DC 20402.
Explosive material means explosives, blasting agents, and detonators.
Face or bank means that part of any mine where excavating is progressing or was last done.
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.
Flammable means capable of being easily ignited and of burning rapidly.
Flammable gas means a gas that will burn in the normal concentrations of oxygen in the air.
Flammable liquid means a liquid that has a flash point below 100 °F (37.8 °C), a vapor pressure not exceeding 40 pounds per square inch (absolute) at 100 °F (37.8 °C), and is known as a Class I liquid.
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.
High potential means more than 650 volts.
Highway means any public street, public alley, or public road.
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.
Igniter cord means a fuse, cordlike in appearance, which burns progressively along its length with an external flame at the zone of burning, and is used for lighting a series of safety fuses in the desired sequence.
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. When any substance is said to be insulated, it is understood to be insulated in a manner suitable for the conditions to which it is subjected. Otherwise, it is, within the purpose of this definition, uninsulated. Insulating covering is one means for making the conductor insulated.
Insulation means a dielectric substance offering a high resistance to the passage of current and to a disruptive discharge through the substance.
Laminated partition means a partition composed of the following material and minimum nominal dimensions:
1/2 -inch-thick plywood,
1/2 -inch-thick gypsum wallboard,
1/8 -inch-thick low carbon steel, and
1/4 -inch-thick plywood, bonded together in that order (IME-22 Box). A laminated partition also includes alternative construction materials described in the Institute of Makers of Explosives (IME) Safety Library Publication No. 22, “Recommendations for the Safe Transportation of Detonators in a Vehicle with Other Explosive Materials” (May 1993), and the “Generic Loading Guide for the IME-22 Container” (October 1993). The IME is located at 1120 19th Street NW., Suite 310, Washington, DC 20036-3605; 202-429-9280; https://www.ime.org. This incorporation by reference has been approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies are available at MSHA's Office of Standards, Regulations, and Variances, 200 Constitution Avenue NW, Washington, DC 20210; 202-693-9440; and at all Metal and Nonmetal Mine Safety and Health District Offices, or available for inspection at the National Archives and Records Administration (NARA). For information on the availability of this material at NARA, call 202-741-6030, or go to: http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html.
Lay means the distance parallel to the axis of the rope in which a strand makes one complete turn about the axis of the rope.
Loading means placing explosive material either in a blasthole or against the material to be blasted.
Low potential means 650 volts or less.
Magazine means a facility for the storage of explosives, blasting agents, or detonators.
Major electrical installation means an assemblage of stationary electrical equipment for the generation, transmission, distribution, or conversion of electrical power.
Mantrip means a trip on which persons are transported to and from a work area.
Mill includes any ore mill, sampling works, concentrator, and any crushing, grinding, or screening plant used at, and in connection with, an excavation or mine.
Misfire means the complete or partial failure of a blasting charge to explode as planned.
Mobile equipment means wheeled, skid-mounted, track-mounted, or rail-mounted equipment capable of moving or being moved.
Multipurpose dry-chemical fire extinguisher means an extinguisher having a rating of at least 2-A:10-B:C and containing a nominal 4.5 pounds or more of dry-chemical agent.
Noncombustible material means a material that, in the form in which it is used and under the conditions anticipated, will not ignite, burn, support combustion, or release flammable vapors when subjected to fire or heat. Concrete, masonry block, brick, and steel are examples of noncombustible materials.
Non-electric delay blasting cap means a detonator with an integral delay element and capable of being initiated by miniaturized detonating cord.
Overburden means material of any nature, consolidated or unconsolidated, that overlies a deposit of useful materials or ores that are to be mined.
Overload means that current which will cause an excessive or dangerous temperature in the conductor or conductor insulation.
Permissible means a machine, material, apparatus, or device that has been investigated, tested, and approved by the Bureau of Mines or the Mine Safety and Health Administration and is maintained in permissible condition.
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 169-182 revised as of July 1, 1977. Where no such requirements are applicable, the drinking water provided shall conform with the Public Health Service Drinking Water Standards, 42 CFR part 72, subpart J, pages 527-533, revised as of October 1, 1976. Publications to which references are made in this definition are hereby made a part hereof. These incorporated publications are available for inspection at each Metal and Nonmetal Mine Safety and Health District Office of the Mine Safety and Health Administration.
Powder chest means a substantial, nonconductive portable container equipped with a lid and used at blasting sites for explosives other than blasting agents.
Primer means a unit, package, or cartridge of explosives used to initiate other explosives or blasting agents, and which contains a detonator.
Reverse-current protection means a method or device used on direct-current circuits or equipment to prevent the flow of current in the reverse direction.
Rock fixture means any tensioned or nontensioned device or material inserted into the ground to strengthen or support the ground.
Roll protection means a framework, safety canopy or similar protection for the operator when equipment over-turns.
Safety can means an approved container, of not over five gallons capacity, having a spring-closing lid and spout cover.
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.
Safety switch means a sectionalizing switch that also provides shunt protection in blasting circuits between the blasting switch and the shot area.
Scaling means removal of insecure material from a face or highwall.
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.
Shaft means a vertical or inclined shaft, a slope, incline or winze.
Short circuit means an abnormal connection of relatively low resistance, whether made accidentally or intentionally, between two points of different potential in a circuit.
Slurry (as applied to blasting). See “Water gel.”
Storage facility means the entire class of structures used to store explosive materials. A “storage facility” used to store blasting agents corresponds to a BATF Type 4 or 5 storage facility.
Storage tank means a container exceeding 60 gallons in capacity used for the storage of flammable or combustible liquids.
Stray current means that portion of a total electric current that flows through paths other than the intended circuit.
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.
Suitable means that which fits, and has the qualities or qualifications to meet a given purpose, occasion, condition, function, or circumstance.
Travelway means a passage, walk or way regularly used and designated for persons to go from one place to another.
Water gel or Slurry (as applied to blasting) means an explosive or blasting agent containing substantial portions of water.
Wet drilling means the continuous application of water through the central hole of hollow drill steel to the bottom of the drill hole.
Working place means any place in or about a mine where work is being performed.
Mine operators seeking further information in the area of fire prevention and control may consult the following national consensus standards.
MSHA standard
National consensus standard
§§ 56.4200, 56.4201
NFPA No. 10—Portable Fire Extinguisher.
NFPA No. 11—Low Expansion Foam and Combined Agent Systems.
NFPA No. 11A—High Expansion Foam Systems.
NFPA No. 12—Carbon Dioxide Extinguishing Systems.
NFPA No. 12A—Halon 1301 Extinguishing Systems.
NFPA No. 13—Water Sprinkler Systems.
NFPA No. 14—Standpipe and Hose Systems.
NFPA No. 15—Water Spray Fixed Systems.
NFPA No. 16—Foam Water Spray Systems.
NFPA No. 17—Dry-Chemical Extinguishing Systems.
NFPA No. 121—Mobile Surface Mining Equipment.
NFPA No. 291—Testing and Marketing Hydrants.
NFPA No. 1962—Care, Use, and Maintenance of Fire Hose, Connections, and Nozzles.
§ 56.4202
NFPA No. 14—Standpipe and Hose Systems.
NFPA No. 291—Testing and Marketing Hydrants.
§ 56.4203
NFPA No. 10—Portable Fire Extinguishers.
§ 56.4230
NFPA No. 10—Portable Fire Extinguishers.
NFPA No. 121—Mobile Surface Mining Equipment.
Mine operators seeking further information regarding the construction and installation of falling object protective structures (FOPS) may consult the following national consensus standards, as applicable.
MSHA Standard 56.14106, Falling Object Protection.
Equipment
National consensus standard
Front-end loaders and bulldozers
Society of Automotive Engineers (SAE) minimum performance criteria for falling object protective structures (FOPS) SAE J231—January, 1981.
Fork-lift trucks
American National Standards Institute (ANSI) safety standard for low lift and high lift trucks, B 56.1, section 7.27—1983; or,
American National Standards Institute (ANSI) standard, rough terrain fork lift trucks, B56.6—1987.
The owner, operator, or person in charge of any metal and nonmetal mine shall notify the nearest MSHA Metal and Nonmetal Mine Safety and Health district office before starting operations, of the approximate or actual date mine operation will commence. The notification shall include the mine name, location, the company name, mailing address, person in charge, and whether operations will be continuous or intermittent.
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.
The following definitions apply in this subpart.
Travelway. A passage, walk, or way regularly used or designated for persons to go from one place to another.
Mining methods shall be used that will maintain wall, bank, and slope stability in places where persons work or travel in performing their assigned tasks. When benching is necessary, the width and height shall be based on the type of equipment used for cleaning of benches or for scaling of walls, banks, and slopes.
In places where persons work or travel in performing their assigned tasks, loose or unconsolidated material shall be sloped to the angle of repose or stripped back for at least 10 feet from the top of the pit or quarry wall. Other conditions at or near the perimeter of the pit or quarry wall which create a fall-of-material hazard to persons shall be corrected.
Ground conditions that create a hazard to persons shall be taken down or supported before other work or travel is permitted in the affected area. Until corrective work is completed, the area shall be posted with a warning against entry and, when left unattended, a barrier shall be installed to impede unauthorized entry.
Scaling shall be performed from a location which will not expose persons to injury from falling material, or other protection from falling material shall be provided.
Where manual scaling is performed, a scaling bar shall be provided. This bar shall be of a length and design that will allow the removal of loose material without exposing the person performing this work to injury.
(a) For rock bolts and accessories addressed in ASTM F432-95, “Standard Specification for Roof and Rock Bolts and Accessories,” the mine operator shall—
(1) Obtain a manufacturer's certification that the material was manufactured and tested in accordance with the specifications of ASTM F432-95; and
(2) Make this certification available to an authorized representative of the Secretary and to the representative of miners.
(b) Fixtures and accessories not addressed in ASTM F432-95 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
(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. During the test process, access to the test area shall be limited to persons necessary to conduct the test.
(c) Bearing plates shall be used with fixtures when necessary for effective ground support.
(d) The diameter of finishing bits shall be within a tolerance of plus or minus 0.030 inch of the manufacturer's recommended hole diameter for the anchor used. When separate finishing bits are used, they shall be distinguishable from other bits.
(e) Damaged or deteriorated cartridges of grouting material shall not be used.
(f) When rock bolts tensioned by torquing are used as a means of ground support,
(1) Selected tension level shall be—
(i) At least 50 percent of either the yield point of the bolt or anchorage capacity of the rock, whichever is less; and
(ii) No greater than the yield point of the bolt or anchorage capacity of the rock.
(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. If the torque of any fixture tested does not fall within the installation torque range, corrective action shall be taken.
(g) When grouted fixtures can be tested by applying torque, the first fixture installed in each work place shall be tested to withstand 150 foot-pounds of torque. Should it rotate in the hole, a second fixture shall be tested in the same manner. If the second fixture also turns, corrective action shall be taken.
(h) When other tensioned and nontensioned fixtures are used, test methods shall be established to verify their effectiveness.
(i) The mine operator shall certify that tests were conducted and make the certification available to an authorized representative of the Secretary.
Prior to secondary breakage operations, material to be broken, other than hanging material, shall be positioned or blocked to prevent movement which would endanger persons in the work area. Secondary breakage shall be performed from a location which would not expose persons to danger.
Persons experienced in examining and testing for loose ground shall be designated by the mine operator. Appropriate supervisors or other designated persons shall examine and, where applicable, test ground conditions in areas where work is to be performed prior to work commencing, after blasting, and as ground conditions warrant during the work shift. Highwalls and banks adjoining travelways shall be examined weekly or more often if changing ground conditions warrant.
Persons shall not work or travel between machinery or equipment and the highwall or bank where the machinery or equipment may hinder escape from falls or slides of the highwall or bank. Travel is permitted when necessary for persons to dismount.
The following definitions apply in this subpart.
Flash point. The minimum temperature at which sufficient vapor is released by a liquid to form a flammable vapor-air mixture near the surface of the liquid.
Safety can. 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.
Abandoned electric circuits shall be deenergized and isolated so that they cannot become energized inadvertently.
No person shall smoke or use an open flame where flammable or combustible liquids, including greases, or flammable gases are—
(a) Used or transported in a manner that could create a fire hazard; or
(b) Stored or handled.
Readily visible signs prohibiting smoking and open flames shall be posted where a fire or explosion hazard exists.
Flammable or combustible liquid spillage or leakage shall be removed in a timely manner or controlled to prevent a fire hazard.
Internal combustion engines shall be switched off before refueling if the fuel tanks are integral parts of the equipment. This standard does not apply to diesel-powered equipment.
(a) Waste materials, including liquids, shall not accumulate in quantities that could create a fire hazard.
(b) Until disposed of properly, waste or rags containing flammable or combustible liquids that could create a fire hazard shall be placed in covered metal containers or other equivalent containers with flame containment characteristics.
(a) If a hazard to persons could be created, no combustible materials shall be stored or allowed to accumulate within 25 feet of the following:
(1) Electric substations.
(2) Unburied, flammable or combustible liquid storage tanks.
(3) Any group of containers used for storage of more than 60 gallons of flammable or combustible liquids.
(b) The area within the 25-foot perimeter shall be kept free of dry vegetation.
(a) For fighting fires that could endanger persons, each mine shall have—
(1) Onsite firefighting equipment for fighting fires in their early stages; and
(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.
(b) This onsite firefighting equipment shall be—
(1) Of the type, size, and quantity that can extinguish fires of any class which could occur as a result of the hazards present; and
(2) Strategically located, readily accessible, plainly marked, and maintained in fire-ready condition.
(a) Firefighting equipment shall be inspected according to the following schedules:
(1) Fire extinguishers shall be inspected visually at least once a month to determine that they are fully charged and operable.
(2) At least once every twelve months, maintenance checks shall be made of mechanical parts, the amount and condition of extinguishing agent and expellant, and the condition of the hose, nozzle, and vessel to determine that the fire extinguishers will operate effectively.
(3) Fire extinguishers shall be hydrostatically tested according to Table C-1 or a schedule based on the manufacturer's specifications to determine the integrity of extinguishing agent vessels.
(4) Water pipes, valves, outlets, hydrants, and hoses that are part of the mine's firefighting system shall be visually inspected at least once every three months for damage or deterioration and use-tested at least once every twelve months to determine that they remain functional.
(5) Fire suppression systems shall be inspected at least once every twelve months. An inspection schedule based on the manufacturer's specifications or the equivalent shall be established for individual components of a system and followed to determine that the system remains functional. Surface fire suppression systems are exempt from these inspection requirements if the systems are used solely for the protection of property and no persons would be affected by a fire.
(b) At the completion of each inspection or test required by this standard, the person making the inspection or test shall certify that the inspection or test has been made and the date on which it was made. Certifications of hydrostatic testing shall be retained until the fire extinguisher is retested or permanently removed from service. Other certifications shall be retained for one year.
Table C-1—Hydrostatic Test Intervals for Fire Extinguishers
Extinguisher type
Test interval (years)
Soda Acid
5
Cartridge-Operated Water and/or Antifreeze
5
Stored-Pressure Water and/or Antifreeze
5
Wetting Agent
5
Foam
5
AFFF (Aqueous Film Forming Foam)
5
Loaded Stream
5
Dry-Chemical with Stainless Steel Shells
5
Carbon Dioxide
5
Dry-Chemical, Stored Pressure, with Mild Steel Shells, Brazed Brass Shells, or Aluminum Shells
12
Dry-Chemical, Cartridge or Cylinder Operated, with Mild Steel Shells
12
Bromotrifluoromethane—Halon 1301
12
Bromochlorodifluoromethane—Halon 1211
12
Dry-Powder, Cartridge or Cylinder-Operated, with Mild Steel Shells 1
12
1 Except for stainless steel and steel used for compressed gas cylinders, all other steel shells are defined as “mild steel” shells.
If fire hydrants are part of the mine's firefighting system, the hydrants shall be provided with—
(a) Uniform fittings or readily available adapters for onsite firefighting equipment;
(b) Readily available wrenches or keys to open the valves; and
(c) Readily available adapters capable of connecting hydrant fittings to the hose equipment of any firefighting organization relied upon by the mine.
Fire extinguishers shall be recharged or replaced with a fully charged extinguisher promptly after any discharge.
(a)(1) Whenever a fire or its effects could impede escape from self-propelled equipment, a fire extinguisher shall be on the equipment.
(2) Whenever a fire or its effects would not impede escape from the equipment but could affect the escape of other persons in the area, a fire extinguisher shall be on the equipment or within 100 feet of the equipment.
(b) A fire suppression system may be used as an alternative to fire extinguishers if the system can be manually activated.
(c) Fire extinguishers or fire suppression systems shall be of a type and size that can extinguish fires of any class in their early stages which could originate from the equipment's inherent fire hazards. Fire extinguishers or manual actuators for the suppression system shall be located to permit their use by persons whose escape could be impeded by fire.
(a) Mine operators shall establish emergency firefighting, evacuation, and rescue procedures. These procedures shall be coordinated in advance with available firefighting organizations.
(b) Fire alarm procedures or systems shall be established to promptly warn every person who could be endangered by a fire.
(c) Fire alarm systems shall be maintained in operable condition.
Emergency firefighting drills shall be held at least once every six months for persons assigned firefighting responsibilities by the mine operator.
(a) Flammable liquids shall not be used for cleaning.
(b) Solvents shall not be used near an open flame or other ignition source, near any source of heat, or in an atmosphere that can elevate the temperature of the solvent above the flash point.
Fixed, unburied, flammable or combustible liquid storage tanks shall be securely mounted on firm foundations. Piping shall be provided with flexible connections or other special fittings where necessary to prevent leaks caused by tanks settling.
Small quantities of flammable liquids drawn from storage shall be kept in safety cans labeled to indicate the contents.
(a) Storage tanks for flammable or combustible liquids shall be—
(1) Capable of withstanding working pressures and stresses and compatible with the type of liquid stored;
(2) Maintained in a manner that prevents leakage;
(3) Isolated or separated from ignition sources to prevent fire or explosion; and
(4) Vented or otherwise constructed to prevent development of pressure or vacuum as a result of filling, emptying, or atmospheric temperature changes. Vents for storage of Class I, II, or IIIA liquids shall be isolated or separated from ignition sources. These pressure relief requirements do not apply to tanks used for storage of Class IIIB liquids that are larger than 12,000 gallons in capacity.
(b) All piping, valves, and fittings shall be—
(1) Capable of withstanding working pressures and stresses;
(2) Compatible with the type of liquid stored; and
(3) Maintained in a manner that prevents leakage.
(c) Fixed, unburied tanks located where escaping liquid could present a hazard to persons shall be provided with—
(1) Containment for the entire capacity of the largest tank; or
(2) Drainage of a remote impoundment area that does not endanger persons. However, storage of only Class IIIB liquids does not require containment or drainage to remote impoundment.
Heat sources capable of producing combustion shall be separated from combustible materials if a fire hazard could be created.
Fuel lines shall be equipped with valves capable of stopping the flow of fuel at the source and shall be located and maintained to minimize fire hazards. This standard does not apply to fuel lines on self-propelled equipment.
(a) Battery-charging stations shall be ventilated with a sufficient volume of air to prevent the accumulation of hydrogen gas.
(b) Smoking, use of open flames, or other activities that could create an ignition source shall be prohibited at the battery charging station during battery charging.
(c) Readily visible signs prohibiting smoking or open flames shall be posted at battery-charging stations during battery charging.
Belt conveyors within confined areas where evacuation would be restricted in the event of a fire resulting from belt-slippage shall be equipped with a detection system capable of automatically stopping the drive pulley. A person shall attend the belt at the drive pulley when it is necessary to operate the conveyor while temporarily bypassing the automatic function.
Buildings or structures in which persons work shall have a sufficient number of exits to permit prompt escape in case of fire.
(a) Storage buildings or storage rooms in which flammable or combustible liquids, including grease, are stored and that are within 100 feet of any person's work station shall be ventilated with a sufficient volume of air to prevent the accumulation of flammable vapors.
(b) In addition, the buildings or rooms shall be—
(1) Constructed to meet a fire resistance rating of at least one hour; or
(2) Equipped with an automatic fire suppression system; or
(3) Equipped with an early warning fire detection device that will alert any person who could be endangered by a fire, provided that no person's work station is in the building.
(c) Flammable or combustible liquids in use for day-to-day maintenance and operational activities are not considered in storage under this standard.
(a) When welding, cutting, soldering, thawing, or bending—
(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 2-A:10-B:C rating shall be at the worksite.
(2) With an open flame in an area where no electrical hazard exists, a multipurpose dry-chemical fire extinguisher or equivalent fire extinguishing equipment for the class of fire hazard present shall be at the worksite.
(b) Use of halogenated fire extinguishing agents to meet the requirements of this standard shall be limited to Halon 1211 (CBrClF 2 ) and Halon 1301 (CBrF 3 ). When these agents are used in confined or unventilated areas, precautions based on the manufacturer's use instructions shall be taken so that the gases produced by thermal decompostion of the agents are not inhaled.
Oxygen cylinders shall not be stored in rooms or areas used or designated for storage of flammable or combustible liquids, including grease.
Gauges and regulators used with oxygen or acetylene cylinders shall be kept clean and free of oil and grease.
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—
(a) The cylinders are moved;
(b) The torch and hoses are left unattended; or
(c) The task or series of tasks is completed.
Before welding, cutting, or applying heat with an open flame to pipelines or containers that have contained flammable or combustible liquids, flammable gases, or explosive solids, the pipelines or containers shall be—
(a) Drained, ventilated, and thoroughly cleaned of any residue;
(b) Vented to prevent pressure build-up during the application of heat; and
(c)(1) Filled with an inert gas or water, where compatible; or
(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.
Link to an amendment published at 89 FR 28469, Apr. 18, 2024.
The following is required until April 7, 2026. Except as permitted by § 56.5005—
(a) Except as provided in paragraph (b) of this section, 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. This publication may be obtained from the American Conference of Governmental industrial Hygienists by writing to 1330 Kemper Meadow Drive, Attn: Customer Service, Cincinnati, OH 45240; http://www.acgih.org” , or may be examined in any Metal and Nonmetal Mine Safety and Health District Office of the Mine Safety and Health Administration. Excursions above the listed thresholds shall not be of a greater magnitude than is characterized as permissible by the Conference.
(b) Asbestos standard —(1) Definitions. 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.
Asbestos means chrysotile, cummingtonite-grunerite asbestos (amosite), crocidolite, anthophylite asbestos, tremolite asbestos, and actinolite asbestos.
Asbestos fiber means a fiber of asbestos that meets the criteria of a fiber.
Fiber means a particle longer than 5 micrometers (µm) with a length-to-diameter ratio of at least 3-to-1.
(2) Permissible Exposure Limits (PELs) —(i) Full-shift limit. A miner's personal exposure to asbestos shall not exceed an 8-hour time-weighted average full-shift airborne concentration of 0.1 fiber per cubic centimeter of air (f/cc).
(ii) Excursion limit. No miner shall be exposed at any time to airborne concentrations of asbestos in excess of 1 fiber per cubic centimeter of air (f/cc) as averaged over a sampling period of 30 minutes.
(3) Measurement of airborne asbestos fiber concentration. Potential asbestos fiber concentration shall be determined by phase contrast microscopy (PCM) using the OSHA Reference Method in OSHA's asbestos standard found in 29 CFR 1910.1001, Appendix A, or a method at least equivalent to that method in identifying a potential asbestos exposure exceeding the 0.1 f/cc full-shift limit or the 1 f/cc excursion limit. When PCM results indicate a potential exposure exceeding the 0.1 f/cc full-shift limit or the 1 f/cc excursion limit, samples shall be further analyzed using transmission electron microscopy according to NIOSH Method 7402 or a method at least equivalent to that method.
(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.
Link to an amendment published at 89 FR 28469, Apr. 18, 2024.
As of April 8, 2026 the following is required, except as permitted by § 56.5005—
(a) TLVs standard. Except as provided in paragraph (b) of this section and in part 60 of this chapter, 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. This publication is incorporated by reference into this section with the approval of the Director of the Federal Register under 5 U.S.C. 552(a) and 1 CFR part 51. This incorporation by reference (IBR) material is available for inspection at the Mine Safety and Health Administration (MSHA) and at the National Archives and Records Administration (NARA). Contact MSHA at: MSHA's Office of Standards, Regulations, and Variances, 200 Constitution Avenue NW, Washington, DC 20210; (202) 693-9440; or at any Mine Safety and Health Enforcement District Office. For information on the availability of this material at NARA, visit www.archives.gov/federal-register/cfr/ibr-locations or email [email protected]. The material may be obtained from American Conference of Governmental Industrial Hygienists, 1330 Kemper Meadow Drive, Attn: Customer Service, Cincinnati, OH 45240; www.acgih.org.
(b) Asbestos standard —(1) Definitions. 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.
Asbestos means chrysotile, cummingtonite-grunerite asbestos (amosite), crocidolite, anthophylite asbestos, tremolite asbestos, and actinolite asbestos.
Asbestos fiber means a fiber of asbestos that meets the criteria of a fiber.
Fiber means a particle longer than 5 micrometers (µm) with a length-to-diameter ratio of at least 3-to-1.
(2) Permissible Exposure Limits (PELs) —(i) Full-shift limit. A miner's personal exposure to asbestos shall not exceed an 8-hour time-weighted average full-shift airborne concentration of 0.1 fiber per cubic centimeter of air (f/cc).
(ii) Excursion limit. No miner shall be exposed at any time to airborne concentrations of asbestos in excess of 1 fiber per cubic centimeter of air (f/cc) as averaged over a sampling period of 30 minutes.
(3) Measurement of airborne asbestos fiber concentration. Potential asbestos fiber concentration shall be determined by phase contrast microscopy (PCM) using the OSHA Reference Method in OSHA's asbestos standard found in 29 CFR 1910.1001, Appendix A, or a method at least equivalent to that method in identifying a potential asbestos exposure exceeding the 0.1 f/cc full-shift limit or the 1 f/cc excursion limit. When PCM results indicate a potential exposure exceeding the 0.1 f/cc full-shift limit or the 1 f/cc excursion limit, samples shall be further analyzed using transmission electron microscopy according to NIOSH Method 7402 or a method at least equivalent to that method.
(c) Required action. 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.
Dust, gas, mist, and fume surveys shall be conducted as frequently as necessary to determine the adequacy of control measures.
Link to an amendment published at 89 FR 28469, Apr. 18, 2024.
The following is required until April 7, 2026. Control of employee exposure to harmful airborne contaminants shall be, insofar as feasible, by prevention of contamination, removal by exhaust ventilation, or by dilution with uncontaminated air. However, where accepted, engineering control measures have not been developed or when necessary by the nature of work involved (for example, while establishing controls or occasional entry into hazardous atmospheres to perform maintenance or investigation), employees may work for reasonable periods of time in concentrations of airborne contaminants exceeding permissible levels if they are protected by appropriate respiratory protective equipment. Whenever respiratory protective equipment is used a program for selection, maintenance, training, fitting, supervision, cleaning, and use shall meet the following minimum requirements:
(a) Respirators approved by NIOSH under 42 CFR part 84 which are applicable and suitable for the purpose intended shall be furnished and miners shall use the protective equipment in accordance with training and instruction.
(b) A respirator program consistent with the requirements of ANSI Z88.2-1969, published by the American National Standards Institute and entitled “American National Standards Practices for Respiratory Protection ANSI Z88.2-1969,” approved August 11, 1969, which is hereby incorporated by reference and made a part hereof. This publication may be obtained from the American National Standards Institute, Inc., 25 W. 43rd Street, 4th Floor, New York, NY 10036; http://www.ansi.org” , or may be examined in any Metal and Nonmetal Mine Safety and Health District Office of the Mine Safety and Health Administration.
(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.
Link to an amendment published at 89 FR 28469, Apr. 18, 2024.
As of April 8, 2026, the following is required. Control of employee exposure to harmful airborne contaminants shall be, insofar as feasible, by prevention of contamination, removal by exhaust ventilation, or by dilution with uncontaminated air. However, where accepted engineering control measures have not been developed or when necessary by the nature of work involved (for example, while establishing controls or occasional entry into hazardous atmospheres to perform maintenance or investigation), employees may work for reasonable periods of time in concentrations of airborne contaminants exceeding permissible levels if they are protected by appropriate respiratory protective equipment. Whenever respiratory protective equipment is used, its selection, fitting, maintenance, cleaning, training, supervision, and use shall meet the following minimum requirements:
(a) Respirators approved by NIOSH under 42 CFR part 84 which are applicable and suitable for the purpose intended shall be furnished and miners shall use the protective equipment in accordance with training and instruction.
(b) A written respiratory protection program consistent with the requirements of ASTM F3387-19, Standard Practice for Respiratory Protection, approved August 1, 2019, which is incorporated by reference into this section with the approval of the Director of the Federal Register under 5 U.S.C. 552(a) and 1 CFR part 51. This incorporation by reference (IBR) material is available for inspection at the Mine Safety and Health Administration (MSHA) and at the National Archives and Records Administration (NARA). Contact MSHA at: MSHA's Office of Standards, Regulations, and Variances, 200 Constitution Avenue NW, Washington, DC 20210; (202) 693-9440; or any Mine Safety and Health Enforcement District Office. For information on the availability of this material at NARA, visit www.archives.gov/federal-register/cfr/ibr-locations or email [email protected]. The material may be obtained from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959; www.astm.org.
(c) When respiratory protection is used in atmospheres immediately dangerous to life or health (IDLH), 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.
SAFETY AND HEALTH STANDARDS—SURFACE METAL AND NONMETAL MINES (U.S.C.). Retrieved via LawPlayer, https://lawplayer.com/us/act/cfr-title-30-part-56
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