- 行业: Mining
- Number of terms: 33118
- Number of blossaries: 0
- Company Profile:
The U.S. Bureau of Mines (USBM) was the primary United States Government agency conducting scientific research and disseminating information on the extraction, processing, use, and conservation of mineral resources.
Founded on May 16, 1910, through the Organic Act (Public Law 179), USBM's missions ...
Explosive containing low-density gelatin; used for submarine blasting.
Industry:Mining
Explosive containing TNT instead of nitroglycerin to sensitize ammonium nitrate; a little aluminum powder may also be added to increase power and sensitiveness. Straight TNTammonium nitrate explosives usually contain 15% to 18% TNT and 82% to 85% ammonium nitrate. TNT-ammonium nitrate explosives have densities between 1.0 g/cm<sub>3</sub>and 1.2 g/cm<sub>3</sub>and velocities of detonation between 3,200 m/s and 4,000 m/s. They are reasonably free from noxious fumes. This type of explosive is susceptible to moisture and should be used only in dry conditions unless packed in sealed containers. The main use of non-nitroglycerin explosives is in primary blasting in quarries and opencast mining, although they are used in some underground work, particularly in ironstone mining. The combination of high strength and relatively high velocity of detonation also makes them applicable for secondary blasting by plaster shooting.
Industry:Mining
Explosive designed for use in mining, where it is required to blast with the least amount of shattering and/or to reduce explosive cost. The density of ordinary explosives may be decreased by (1) loose packing, (2) an alteration in the granular state of the ammonium nitrate, and (3) the impregnation of woodmeal or suitable substitutes. By decreasing the density of an explosive the same weight of explosive is used, but owing to its greater bulk the explosive effects are distributed over a greater area, thus producing a less shattering effect.
Industry:Mining
Explosive that has a fire hazard and either a minor blast hazard or a minor projection hazard or both, but not a mass explosion hazard; previously designated by the U.S. Department of Transportation as a Class B explosive and defined as possessing a flammable hazard, such as, but not limited to, propellant explosives, photographic flash powders, and some special fireworks.
Industry:Mining
Explosive that has a mass explosion hazard or one that will affect almost the entire load instantaneously; previously designated by the U.S. Department of Transportation as a Class A explosive and including, but not limited to, dynamite, nitroglycerin, lead azide, blasting caps and detonating primers.
Industry:Mining
Explosive that has a projection hazard but not a mass explosion hazard; previously designated by the U.S. Department of Transportation as a Class A or B explosive.
Industry:Mining
Explosive that has been tested for safety in handling and approved for use in mines by the U.S. Mine Safety and Health Administration.
Industry:Mining
Explosive that presents a minor explosive hazard, and explosive effects are confined to the package; no projection of fragments of appreciable size or range is to be expected. An external fire must not cause virtually an instantaneous explosion of almost the entire contents of the package; previously designated by the U.S. Department of Transportation as a Class C explosive and defined as containing Class A or Class B explosives, or both, as components but in restricted quantities.
Industry:Mining
