Wyoming Administrative Code › Agency 053 - Workforce Services, Department of › Sub-Agency 0004 - Mining Inspector › Chapter 3 - UNDERGROUND METAL/NONMETAL MINES › Subpart E - Explosives › Section 57.6000 - Definitions

Current through July 13, 2024
The following definitions apply in this subpart.
Attended. Presence of an individual or continuous
					 monitoring to prevent unauthorized entry or access. In addition, areas
					 containing explosive material at underground areas of a mine can be considered
					 attended when all access to the underground areas of the mine is secured from
					 unauthorized entry. Vertical shafts shall be considered secure. Inclined shafts
					 or adits shall be considered secure when locked at the surface. Barrier. A
					 material object, or objects that separates, keeps apart, or demarcates in a
					 conspicuous manner such as cones, a warning sign, or tape.
Blast area. 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. 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) requirements also apply in all
					 directions along the full depth of the hole. In underground mines, at least 15
					 feet (4.6 meters) of solid rib, pillar, or broken rock can be substituted for
					 the 50-foot (15.2-meter) distance. In underground mines utilizing a
					 block-caving system or similar system, at least 6 feet (1.8 meters) of solid
					 rib or pillar, including concrete reinforcement of at least 10 inches (254
					 millimeters), with overall dimensions of not less than 6 feet (1.8 meters), may
					 be substituted for the 50-foot (15.2-meter) distance requirement.
Blasting agent. Any substance classified as a blasting
					 agent by the Department of Transportation in
					 49 CFR
					 173.114a(a). This document
					 is available at any MSHA Metal and Nonmetal Safety and Health district
					 office.
Detonating cord. A flexible cord containing a center core
					 of high explosives which may be used to initiate other explosives.
Detonator. Any device containing a detonating charge used
					 to initiate an explosive. These devices include electric or nonelectric
					 instantaneous or delay blasting caps, and delay connectors. The term
					 "detonator" does not include detonating cord. 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. This document is
					 available at any MSHA Metal and Nonmetal Safety and Health district office.
Emulsion. An explosive material containing substantial
					 amounts of oxidizers dissolved in water droplets, surrounded by an immiscible
					 fuel.
Explosive. Any substance classified as an explosive by the
					 Department of Transportation in
					 49 CFR
					 173.53, 173.88, and 173.100. This document is
					 available at any MSHA Metal and Nonmetal Safety and Health district
					 office.
Explosive material. Explosives, blasting agents, and
					 detonators.
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.
Igniter cord. 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.
Laminated partition. 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. Other combinations of materials may be used,
					 such as plywood, wood or gypsum wallboard as insulators, and steel or wood as
					 structural elements, provided that the partition is equivalent to a laminated
					 partition for both insulation and structural purposes as determined by
					 appropriate testing. The Institute of Makers of Explosives (IME) 22 container
					 or compartment, described in IME Safety Library Publication 22 (Jan. 1985),
					 meets the criteria of a laminated partition. This document is available at any
					 MSHA Metal and Nonmetal Safety and Health district office.
Loading. Placing explosive material either in a blasthole
					 or against the material to be blasted.
Magazine. A bullet-resistant, theft-resistant,
					 fire-resistant, weather-resistant, ventilated facility for the storage of
					 explosives and detonators (BATF Type 1 or Type 2 facility).
Misfire. The complete or partial failure of explosive
					 material to detonate as planned. The term also is used to describe the
					 explosive material itself that has failed to detonate.
Multipurpose dry-chemical fire extinguisher. 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.
Primer. A unit, package, or cartridge of explosives which
					 contains a detonator and is used to initiate other explosives or blasting
					 agents.
Safety switch. 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.
Slurry. An explosive material containing substantial
					 portions of a liquid, oxidizers, and fuel, plus a thickener.
Storage facility. 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.
Water gel. An explosive material containing substantial
					 portions of water, oxidizers, and fuel, plus a cross-linking agent.
STORAGE-SURFACE AND UNDERGROUND