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Day 1: Blasting
Blasting Terms
| Question | Answer |
|---|---|
| A small, flexible plastic tube coated internally with an explosive powder so that it is capable of transmitting a shock wave along the length of the tube | Signal Tube |
| A type of exploder that has a dynamo, the armature of which is manually rotated through gearing from either a plunge rock-bar or a twisting handle. It is usually used in series | Generator Type |
| A type of exploder that have one or more capacitors which are charged from either a battery or dynamo having a manually rotated armature. It is suitable for series firing and most may be used to a limited extent for firing series-in-parallel circuits | Capacitor Type |
| A type of exploder, which provides delay-firing intervals of predetermined duration. | Sequential Type |
| . A connection in an electrical firing circuit, which consists of a number of series, connected in parallel. | Series in parallel connection |
| A connection in an electrical firing circuit in which the detonators are connected in parallel in a number of groups connected in series | Parallel in series connection |
| Gelled, saturated, aqueous solutions usually containing suspended solids and consisting of water, oxidizing salts, fuel components, and various sensitizers. | Water gels |
| This kind of explosive consists of saturated aqueous solutions of oxidizing salts, which are finely dispersed through a continuous oil phase. They may contain additional suspended solids and various sensitizers | Emulsion |
| The separation of nitroglycerin or other nitrobody form the explosive as an oily liquid which may be retained inside or appear on the outside of the wrapper | Exudation |
| The pressure wave transmitted through the air, caused by an explosion | Airblast |
| The intensity of sound which is the limit of human tolerance | 120 dB |
| The sound intensity limit at which structural damage may occur | 133dB |
| These are created to provide free face for subsequent production | cut-off slots |
| . This method of firing is used in ore production in open and/or sublevel stoping | Ring Firing |
| A term in block caving in which oversize boulders are broken at the grizzly level into sized passable to the drawpoint. | Boulder Breakage |
| It is a method to destress a particular volume of rock mass using explosives for stability reasons | Destress Blasting |
| . A type of controlled blasting to reduce the damage to the rock remaining after a blast | Perimeter Blasting |
| An explosive ingredient whose function is to provide oxygen in the detonation process | Oxidizer |
| The best fuel for explosives are those with the highest ______________ | Carbon Content |
| ANFO was first commercialized in 1955 as a mixture of ___________% porous prilled ammonium nitrate and ___________% fuel oil (distillate), respectively | 94-6 |
| .Packaged ANFO is also available in the same form as bulk, except it is ______ kg bags. | 25 |
| It is a unit which when detonated increases the magnitude of detonation | Booster |
| . It is a round flexible cord containing a central core of high explosive and used to initiate an explosive charge | Detonating Cord |
| . It is a high-velocity decomposition and exothermic reaction accompanied by the liberation of vast amounts of energy and very hot gases at tremendously high pressure | Detonation |
| . A detonation agent that has a speed of reaction exceeding that of sound | High Explosive |
| A very rapid burning but not an explosion | Deflagration |
| A kind of explosive that generates no shock wave and hence no detonation pressure | Low explosive |
| This effect is due to the gas pressure action which is equally or more important than the shattering action in breaking | Detonation Pressure |
| The point at which an explosive mixture has sufficient oxgen to completely oxidize all the fuels, but not excess oxygen to react with the contained nitrogen | Zero-oxygen Balance |
| Which of the following is an example of a low explosive | Black Powder |
| Specifically formulated mixtures that are safe to use in flammable atmospheres in underground coal mines | Permessibles |
| Mixture of AN, water and a fuel sensitizer, either explosive or non-explosive, were developed to extend the range of properties of blasting agents | Slurry |
| . An incendiary cord used to sequentially ignite safety fuses | Igniter Cord |
| . A cord which burns at a definite rate, and is used to initiate a plain detonator or a deflagrating explosive | Safety Fuse |
| A super fine mixture of oxidizer solution encapsulated in an oil/wax matrix | Emulsion |
| A capsule or case which contain a sensitive powerful explosive used for initiating other explosives and may not contain more than 10 grams of total explosives by weight, excluding initiations or delay charges | Blasting Cap |
| A high explosive consisting of a mixture of, but not limited to nitroglycerin, nitrocellulose, ammonium nitrate, sodium nitrate and carbonaceous material | Dynamite |
| A small shell containing an explosive compound that is ignited by electric current brought in through the lead wires | Electric Squib |
| These are nearly horizontal holes drilled at the bottom of the face of the bench. After enlarging by small charges of explosives, they are blasted to bring down the bench at one or more shots | Snake Holes |
| A method of blasting in which large charges are fired in small adits into the face of the quarry at level of the floor | Coyote Blasting |
| If the drill holes are too small to hold the necessary charge of explosives, the bottom of the holes must be enlarged. This is ____________ | Springing |
| A charge of explosive placed within the main charge of blasting agent or insensitive explosive to initiate detonatio | Primer |
| It is the percentage of nitroglycerin in a straight nitroglycerin dynamite that produces the same deflection on the balistic mortar as an equal weight of explosive | Weight Strength |
| Explosives designed for underground coal mines where the presence of explosive gases presents an abnormal blasting hazard | Permissible Explosives |
| It deflagrates without production of an intense shock wave. It can be set off by flame | Low explosive |
| It is defined as an explosive susceptibility to initiation | Sensitivity |
| Inert materials placed after the explosive charge used to confine explosive energy | Stemming |
| The rock that is broken by blasting outside the intended area | Back Break |
| . A quarry blasting method wherein succession of charges are fired in a borehole to open a chamber | Chambering |
| A method of loading blast holes in which the explosive charge is separated by stemming or air cushion | Deck Loading |
| A wall rock, usually vertical, either naturally formed or formed by blasting | Face |
| Rock that is thrown an excessive distance from the blast site | Fly Rock |
| Method of blasting in coal mines where hollow cylinders are charged with liquid CO2 under a pressure of 2000 lbs/in2 | Cardox |
| The cheapest explosive next to ANFO | Slurry |
| An explosive made by mixing sulfuric acid, nitric acid and gelatin | Nitroglycerin |
| . The following are the effects of blasting on rock except one | Weathering |
| . It is the distance between rows of blastholes parallel to the major free face | Burden |
| Produces least poisonous fumes than any high explosives | PETN |
| It is a mixture of 90% nitroglycerin and 10% guncotton | Nitrocellulose |
| Portion of blasthole which remains in the face after blasting | Bootleg |
| . The detonation of explosives to break rock | Yield |
| The main explosive charge in a detonator | Primer |
| The head on pressure created by the detonation proceeding down the explosive column | Detonation Pressure |
| A detonation of an explosive charge at a time after its designed firing time | Hangfire |
| A slot cut in a coal or soft rock by a mechanical cutter to provide a free space for blasting | Kerf |
| An overbreak control in which a series of very closely spaced uncharged holes are drilled at the perimeter | Line Drilling |
| Holes adjacent to the cutholes in a heading round | Relievers |
| The ratio of the volume of a material in its solid state to that when broken | Swell Factor |
| The firing device that burns with the flash | Squib |
| The distance of an explosive charge to the nearest free or open space | Spacing |
| The firing device that burns with the flash | Safety Fuse |
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rabadabadab