- 行业: Mining
- Number of terms: 33118
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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 ...
A shell, similar to a shotgun cartridge, that contains an ignition compound in the base. As many as seven fuses can be pushed into the shell until the fuses contact the ignition compound. The lighting of one fuse, which burns into the shell, sets off the compound and ignites the other six fuses.
Industry:Mining
A shiny, white, soft, and ductile metallic element. Symbol, Nb (niobium) or Cb (columbium). The name niobium was adopted by the International Union of Pure and Applied Chemistry. Many chemical societies and government organizations refer to it as niobium, but most metallurgists, metals societies, and commercial producers still refer to the metal as columbium. Found in niobite (or columbite), niobite-tantalite, pyrochlore, and euxenite. Used as an alloying agent in carbon and alloy steels, in nonferrous metals, and in superconductive magnets.
Industry:Mining
A shiny, white, soft, and ductile metallic element. Symbol, Nb (niobium) or Cb (columbium). The name niobium was adopted by the International Union of Pure and Applied Chemistry. Many chemical societies and government organizations refer to it as niobium, but most metallurgists, metals societies, and commercial producers still refer to the metal as columbium. Found in niobite (or columbite), niobite-tantalite, pyrochlore, and euxenite. Used as an alloying agent in carbon and alloy steels, in nonferrous metals, and in superconductive magnets.
Industry:Mining
A shop or mine run according to the requirements of a trade union. Compare: open shop
Industry:Mining
A shop where hand-cobbed mica is rifted, trimmed, graded, and qualified.
Industry:Mining
A shop, or mine, where the union price is paid, but where the workers are not all union members. Compare: union shop
Industry:Mining
A short bar of iron with both ends pointed and bent down so as to hold together two pieces of wood into which the points are driven; or one end may be bent down and pointed, while the other is formed into an eye, so that if the point be driven into a log, the other end may be used to haul on.
Industry:Mining
A short belt carrying material from a loading point to a main conveyor belt.
Industry:Mining
A short belt or other conveyor for use in stables in advance of the longwall face. The conveyor is usually about 18 in (46 cm) wide and driven at the tail end by a combined electric motor and drive pulley. The unit can be transported by sliding on steel skids, and is useful where coal or stone has to be moved short distances in confined spaces.
Industry:Mining
