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. (a) Visible warning devices shall be used when parked mobile equipment creates a hazard to persons in other mobile equipment. These investigations may include an evaluation of the following: (1) Source, nature, and extent of occurrences; (2) Conditions under which the incident occurred; (4) Physical conditions at the time of the occurrence; (5) Charts, logs, and records related to the occurrence; (6) Whether the occurrence is isolated, continuous, or could recur; (7) Conditions indicating that the hazards of methane no longer exist or exist under circumstances more appropriately governed by a different category or subcategory; (8) The geology of the mine and the geological area in which the mine is located; and. 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. (a) Waste materials, including liquids, shall not accumulate in quantities that could create a fire hazard. No employee shall be assigned, or allowed, or be required to perform work alone in any area where hazardous conditions exist that would endanger his safety unless his cries for help can be heard or he can be seen. Movement or operation of equipment near high-voltage powerlines. Individual overload protection or short circuit protection shall be provided for the trailing cables of mobile equipment. (3) Any group of containers used for storage of more than 60 gallons of combustible liquids. If methane reaches 0.25 percent in the mine atmosphere, changes shall be made to improve ventilation, and MSHA shall be notified immediately. (b) If persons are assigned to work areas beyond the warning capabilities of the system, provisions shall be made to alert them in a manner to provide for their safe evacuation in the event of a fire. Timing devices are permitted to avoid nuisance tripping for periods not to exceed 30 seconds, except during blasting or the ventilation time following a blast in a Subcategory II-A mine. Haulage activity is permitted near the base of bench faces being loaded or awaiting firing, provided no other haulage access exists. guide. When a misfire is suspected, persons shall not enter the blast area. Power cables energized to potentials in excess of 150 volts, phase-to-ground, shall not be moved with equipment unless sleds or slings, insulated from such equipment, are used. The overtravel by-pass switch shall return automatically to the open position when released by the hoistman. (d) When water is cooled by ice, the ice shall either be of potable water or shall not come in contact with the water. (a) Explosive material shall be protected from temperatures in excess of 150 degrees Fahrenheit. Subpart FDrilling and Rotary Jet Piercing. (c) Vehicles used for dispensing bulk explosive material shall, (1) Have no zinc or copper exposed in the cargo space; and. Abandoned mine means all work has stopped on the mine premises and an office with a responsible person in charge is no longer maintained at the mine. (d) At the completion of any instruction given under this standard, the mine operator shall certify the date that the instruction was given. 57.6102 Explosive material storage practices. Maintenance between machinery or equipment and ribs. 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. A blasting galvanometer or other instrument designed for testing blasting circuits shall be used to test the following: (1) Continuity of each electric detonator in the blasthole prior to stemming and connection to the blasting line; (2) Resistance of individual series or the resistance of multiple balanced series to be connected in parallel prior to their connection to the blasting line; (3) Continuity of blasting lines prior to the connection of electric or electronic detonator series; and. (a) Any diesel engine introduced into an underground area of a mine covered by this part after July 5, 2001, other than an engine in an ambulance or fire fighting equipment which is utilized in accordance with mine fire fighting and evacuation plans, must either: (1) Have affixed a plate evidencing approval of the engine pursuant to subpart E of Part 7 of this title or pursuant to Part 36 of this title; or. 552(a) and 1 CFR part 51. If it is found or suspected that any part is not functioning properly, the hoist shall not be used until the malfunction has been located and repaired or adjustments have been made. 57.22218 Seals and stoppings (III, V-A, and V-B mines). 57.18002 Examination of working places. (a) On the surface, no more than one day's supply of combustible materials shall be stored within 100 feet of mine openings or within 100 feet of fan installations used for underground ventilation. 57.14213 Ventilation and shielding for welding. (2) Flame safety lamps shall not be used in Subcategory I-C mines. (3) Take other special precautions to address the specific conditions at the mine to prevent premature detonation. 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. If inconsistent with the general definitions in this section, the definition in the subpart will apply in that subpart: Abandoned areas means areas in which work has been completed, no further work is planned, and travel is not permitted. Any portion of a designated escapeway which is inclined more than 30 degrees from the horizontal and that is more than 300 feet in vertical extent shall be provided with an emergency hoisting facility. If explosive material is suspected of burning at the blast site, persons shall be evacuated from the endangered area and shall not return for at least one hour after the burning or suspected burning has stopped. (e) Rotation of miners shall not be considered an acceptable administrative control used for compliance with the DPM standard. Insulation means a dielectric substance offering a high resistance to the passage of current and to a disruptive discharge through the substance. 57.4262 Underground transformer stations, combustible liquid storage and dispensing areas, pump rooms, compressor rooms, and hoist rooms. Mine operators seeking further information in the area of fire prevention and control may consult the following national consensus standards. The wood construction shall be covered on all sides and edges with no less than twenty-four gauge sheet steel. 2. (5) The mine operator must obtain a written determination from the PLHCP regarding the miner's ability to wear a respirator, and the mine operator must assure that the PLHCP provides a copy of the determination to the miner. Purchase records noting sulfur content of diesel fuel. 22, Recommendations for the Safe Transportation of Detonators in a Vehicle with Other Explosive Materials (May 1993), and the Generic Loading Guide for the IME22 Container (October 1993). (b) After installation and before use, and at the beginning of any seven day period during which the conveyance is to be used, the conveyance shall be suitably rested and the hoist rope slackened to test for the unrestricted functioning of the safety catches and their activating mechanisms. Appendix I to Subpart T of Part 57Standard Applicability by Category or Subcategory, Cartridge-Operated Water and/or Antifreeze, Dry-Chemical, Stored Pressure, with Mild Steel Shells, Brazed Brass Shells, or Aluminum Shells, Dry-Chemical, Cartridge or Cylinder Operated, with Mild Steel Shells, Dry-Powder, Cartridge or Cylinder-Operated, with Mild Steel Shells, Welding or cutting with an electric arc or open flame. (2) Separated from explosives or blasting agents by 4 inches of hardwood or equivalent, or a laminated partition. 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). 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. (d) If the monitoring system is inoperable or malfunctions, the mine shall be ventilated for at least 45 minutes and the mine power shall be deenergized before persons enter the mine. Slurry. However, a temporary splice may be made to move the equipment for repair. (3) If located 20 feet or more from exposed timber or other combustible material, the control doors or bulkheads shall provide protection at least equivalent to a door constructed of no less than one-quarter inch of plate steel with channel or angle-iron reinforcement to minimize warpage. (d) Buckets equipped with positive locks to prevent accidental tripping or dumping. 57.9302 Protection against moving or runaway railroad equipment. High potential means more than 650 volts. Each operator shall maintain self-rescue devices in good condition. (g) Safety fuse shall be ignited only with devices designed for that purpose. (c) When a misfire cannot be disposed of safely, each approach to the area affected by the misfire shall be posted with a warning sign at a conspicuous location to prohibit entry, and the condition shall be reported immediately to mine management. Preshift examination (I-A, I-C, II-A, III, and V-A mines). Emergency telephone numbers shall be posted at appropriate telephones. (e) Equipped with audible or visual warning devices, if mechanically operated. (2) Equipped with supply and discharge operating controls. 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 fuse that burns progressively along its length with an external flame at the zone of burning, used for lighting a series of safety fuses in a desired sequence. If used as an alternative, the automatic fire suppression system and alternate escape route shall meet the following requirements: (ii) The appropriate size and type for the particular fire hazards involved; and. Persons shall not be hoisted at a speed faster than 2,500 feet per minute, except in an emergency. (a) An atmospheric monitoring system shall be installed to provide surface readings of methane concentrations in the mine atmosphere from underground locations. 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. Vehicles shall not be used to examine the mine if the monitoring system is inoperable or has malfunctioned.