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blasting definitions
| Term | Definition |
|---|---|
| Ammonium Nitrate | the ammonium salt of nitric acid represented by the formula NH4N03 |
| Bench | a horizontal ledge in or at the top of a highwall from which holes are drilled vertically down into the material being blasted |
| Blast, Blasting | the firing of explosive materials for such purposes as breaking rock or other material, or generating seismic waves; the assembly of explosive materials for such purposes |
| Blast Area | the area of a blast within the influence of flying rock missiles, gases, and concussion |
| Blast Site | the area where the explosive material is handled during loading, including the perimeter of blast holes and 50 feet in all directions from loaded holes or holes to be loaded. In underground mines, 15 feet or solid rib or pillar can be substituted for 50' |
| Blasting log | a written record of information about specific blast as may be required by law or regulation |
| Booster | an explosive charge, usually of high strength and high detonation velocity, used to improve the initiation of less sensitive explosive materials |
| bootleg | the part of a drilled blast-hole that remains when the force of the explosion does not break the rock completely to the bottom of the hole |
| bulk strength | the strength per unit volume of an explosive calculated from its weight, strength and density |
| burden | the distance from the bore-hole to the nearest free face or the distance between bore-holes measured perpendicular to the spacing |
| Cartridge Count (Stick Count) | the number of cartridge in a standard case - a standard case typically contains about 25 kg or 55lbs of explosive material |
| Collar | in blasting it refers to the mouth or opening of a borehole and/ or the measurement from the top of the borehole to the top of the explosive column |
| deflagration | an explosive reaction such as a rapid combustion that moves through an explosive material at a velocity less than the speed of sound in the material |
| density | the mass of an explosive per unit of volume, usually expressed in grams per cubic centimetre or pounds per foot |
| detonating cord | a flexible cord containing a centre core of high explosive and used to initiate other explosives |
| detonation | an explosive reaction that moves through an explosive material at a velocity greater than the speed of sound in the material |
| explosion | a chemical reaction involving an extremely rapid expansion of gasses, usually associated with the liberation of heat |
| Fumes | the gaseous products of an explosion |
| Initiation | the act of causing an explosive material to detonate or deflagrate |
| Loading Pole | a non-metallic pole used to assist the placing and compacting of explosives charges on bore-holes |
| Misfire | a blast that fails to detonate completely after an attempt at initiation; also the explosive ,material itself that failed to detonate as planned |
| Muck | the broken rock or ore displaced from its position in the earth by blasting or carving |
| nitro-glycerine | an explosive chemical compound used as a sensitizer in dynamite and represented by the formula C3H5(ONO2)3 |
| Powder Factor | the amount of explosive used per unit of rock; also called Explosive loading factor |
| Primer | an explosive unit containing a suitable firing device used for the initiation of the entire explosive charge |
| Propagation | the detonation of explosive charges by an impulse received from a adjacent or nearby explosive charges |
| seismograph | an instrument that measures and supplies a record of ground vibrations also called blast vibration monitor |
| Spacing | the distance between bore-holes |
| Sub-drill | to drill blast-Holes beyond the planned grade lines or below floor level |
| Tamping | the action of compacting the explosive charge or the stemming in a blast hole |
| TNT | trinitrotoluene a military compound used a sensitizer in some slurries |
| Toe | in bench blasting the distance from the free face to the blast-hole measured at the floor level of the bench |
| Velocity of Detonation | the measure of the rate at which the detonation wave travels through an explosive |
| Water gel | an explosive material containing substantial portions of water, oxidizers, and fuel plus a cross linking agent |
| Water resistance | a qualitative measure of explosive or blasting agent to withstand exposure to water at a stated pressure without becoming deteriorated or desensitized |
Created by:
lully1994
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