Safety can. (c) If the monitoring system indicates the presence of 1.0 percent or more methane, persons other than examiners shall not enter the mine until the mine has been examined by a competent person and the methane level is less than 1.0 percent. There may be times when special purpose foot protection, such as metatarsal protectors, is needed. Each ungrounded conductor or telephone wire that leads underground and is directly exposed to lightning shall be equipped with suitable lightning arrestors of approved type within 100 feet of the point where the circuit enters the mine. However, persons who normally work in more than one area of the mine shall be instructed at least once every twelve months about the location of escapeways for all areas of the mine in which they normally work or travel. (b) Waste or rags containing flammable or combustible liquids that could create a fire hazard shall be placed in the following containers until disposed of properly: (1) Undergroundcovered metal containers. Society of Automotive Engineers (SAE) minimum performance criteria for falling object protective structures (FOPS) SAE J231January, 1981. (i) The mine operator shall certify that tests were conducted and make the certification available to an authorized representative of the Secretary. Persons shall not ride on loads being moved by cranes or derricks, nor shall they ride the hoisting hooks unless such method eliminates a greater hazard. Parts used to repair hoists shall have properties that will ensure the proper and safe function of the hoist. Overcast and undercast construction (I-A, II-A, III, and V-A mines). Purchase records noting sulfur content of diesel fuel. In mines ventilated by multiple main fans, each main fan installation shall be equipped with noncombustible doors. Rock or supplies shall not be hoisted in the same shaft as persons during shift changes, unless the compartments and dumping bins are partitioned to prevent spillage into the cage compartment. Notification of commencement of operations and closing of mines. L. 95164, 91 Stat. Safety Devices and Maintenance Requirements. (b) Berms or guardrails shall be at least mid-axle height of the largest self-propelled mobile equipment which usually travels the roadway. 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. Personnel Hoisting: 56.19000 - 56.19135 56.19000: Application. The area of the doors or weak-wall shall be at least equivalent to the average cross-sectional area of the airway. Personnel hoisting operations must not begin unless the devices listed in this section are in proper working order. (b) The facilities shall be kept clean and sanitary. Where rope guides are used in shafts other than in shaft sinking operations, the rope guides shall be a type of lock coil construction. (a) Surface 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. 57.19069 Entering and leaving conveyances. When an operator of self-propelled mobile equipment is present, persons shall notify the equipment operator before getting on or off that equipment. (a) An atmospheric monitoring system shall be installed to provide surface readings of methane concentrations in the mine atmosphere from underground locations. (a) All development, production, and bench rounds shall be initiated from the surface after all persons are out of the mine. Regulations | Mine Safety and Health Administration (MSHA) Before hoisting persons and to assure that the hoisting compartments are clear of obstructions, empty hoist conveyances shall be operated at least one round trip after. 552(a) and 1 CFR part 51. 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 examination at the National Archives and Records Administration (NARA). Such measurement shall be done at the following locations: (5) In the last open crosscuts or other ventilation openings nearest the active faces where the air enters the return. (e) Blasting caps shall be crimped to fuse only with implements designed for that purpose. (1) The line of detonating cord extending out of a blasthole shall be cut from the supply spool immediately after the attached explosive is correctly positioned in the hole; (2) In multiple row blasts, the trunkline layout shall be designed so that the detonation can reach each blasthole from at least two directions; (3) Connections shall be tight and kept at right angles to the trunkline; (4) Detonators shall be attached securely to the side of the detonating cord and pointed in the direction in which detonation is to proceed; (5) Connections between blastholes shall not be made until immediately prior to clearing the blast site when surface delay detonators are used; and. 57.22236 Actions at 1.0 percent methane (VI mines). NFPA No. Mine atmosphere means any point at least 12 inches away from the back, face, rib, and floor in any mine; and additionally, in a Category IV mine, at least 3 feet laterally away from the collar of a borehole which releases gas into a mine. (2) Tests for methane shall be made with hand-held methanometers, methane monitors, atmospheric monitoring systems, devices used to provide laboratory analysis of samples, or with other equally effective sampling devices. 57.11016 Snow and ice on walkways and travelways. Waterline outlets that are located at underground shaft stations and are part of the mine's fire protection system shall have at least one fitting located for, and capable of, immediate connection to firefighting equipment. Persons shall not perform maintenance work between machinery or equipment and ribs unless the area has been tested and, when necessary, secured. (a) At least once every fourteen calendar days, each wire rope in service shall be visually examined along its entire active length for visible structural damage, corrosion, and improper lubrication or dressing. (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. Foam-type blocks shall not be used for seals. (1) Within twenty four hours report to the nearest MSHA office each rock burst which: (iv) Disrupts mining activity for more than one hour. Grounding transformer and switchgear enclosures. Shaft landings shall be equipped with substantial safety gates so constructed that materials will not go through or under them; gates shall be closed except when loading or unloading shaft conveyances. Such doors shall automatically close to prevent air reversal through the fan. (iii) The engine shut off unless powering a device being used in the loading operation. Such certification shall be available at the mine. (4) Category IV applies to mines in which noncombustible ore is extracted and which liberate a concentration of methane that is not explosive nor capable of forming explosive mixtures with air based on the history of the mine or the geological area in which the mine is located. (9) Kept securely locked unless all access to the mine is either locked or attended. Surface buildings or structures in which persons work shall have a sufficient number of exits to permit prompt escape in case of fire. (b) When the entire length of the conveyor is not visible from the starting switch, a system which provides visible or audible warning shall be installed and operated to warn persons that the conveyor will be started. When such energized cables are moved manually, insulated hooks, tongs, ropes, or slings shall be used unless suitable protection for persons is provided by other means. (b) The operator or the representative of the miners shall have the right to request of the Administrator reassignment of the mine to a more appropriate category or subcategory if, based on operating experience, the conditions set forth in 57.22003(b) indicate that the hazards of methane exist under circumstances more appropriately governed by a different category or subcategory. 57.19068 Orderly conduct in conveyances. If used as an alternative, reversal of mechanical ventilation shall. Initiation systems shall be used in accordance with the manufacturer's instructions. [50 FR 4082, Jan. 29, 1985, as amended at 71 FR 16667, Apr. This incorporation by reference has been approved by the Director of the Federal Register in accordance with 5 U.S.C. Procedures during repairs or maintenance. Other persons may reenter the mine after the main fans have been operational for at least 30 minutes, or after the mine atmosphere has been tested and contains less than 1.0 percent methane. (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. Safety Devices, Provisions, and Procedures for Roadways, Railroads, and Loading and Dumping Sites. (e) This standard is not applicable to rail beds. MSHA - Program Policy Manual - Volume IV Persons shall not smoke and open flames shall not be used in the vicinity of the oxygen storage and supply lines. (b) Waste oil, including crankcase oil, shall not be used to prepare ammonium nitrate-fuel oil. (c) Mechanical ventilation reversal. Health Activity Certification or Hoisting Engineers Qualification Continuous methane monitors with audible alarms may be used after the initial test has been conducted as an alternative to the ten-minute interval testing requirement. If blasting a loaded round may be delayed for more than 72 hours, the operator shall notify the appropriate MSHA district office. The final decision shall be served upon the mine operator and representative of the miners. 57.12048 Communication conductors on power poles. (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. The operator must retain purchase records that demonstrate compliance with this requirement for one year after the date of purchase. All persons shall wear safety glasses, goggles, or face shields or other suitable protective devices when in or around an area of a mine or plant where a hazard exists which could cause injury to unprotected eyes. 57.19072 Skips and cages in same compartment. Capped primer means a package or cartridge of explosives which is specifically designed to transmit detonation to other explosives and which contains a detonator. Protection against moving or runaway railroad equipment. (a) Diesel fuel used to power equipment in underground areas must not have a sulfur content greater than 0.05 percent. Actions at 2.0 to 2.5 percent methane in bleeder systems (I-A and III mines). Electric auxiliary fans shall be approved by MSHA under the applicable requirements of 30 CFR part 18. Warning devices for restricted clearances.
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