- 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 ...
The hues or wavelengths into which white light is separated upon passing through a transparent prism, six of which are readily distinguished by the normal human eye: red, orange, yellow, green, blue, and violet.
Industry:Mining
The hydraulic process of drilling that consists of rotating a column of drill pipe, to the bottom of which is attached a drilling bit, and during the operation, circulating down through the pipe a current of mud-laden fluid, under pressure, by means of special slush pumps. The drilling mud and cuttings from the bit are forced upward and outside the drill pipe to the surface. Compare: cable-tool drilling
Industry:Mining
The hydrothermal introduction of epidote into rocks or the alteration of rocks in which plagioclase is albitized, freeing the anorthite molecule for the formation of epidote and zoisite, often accompanied by chloritization. These processes are characteristically associated with metamorphism.
Industry:Mining
The identification of a coal seam; the linking up or matching of a seam exposed in different parts of a mine or coalfield. A coal seam may be correlated by lithology, by fossils, by chemical composition, or by its spore content. Coal-seam correlation is very important in exploration and in penetrating faults.
Industry:Mining
The identification, recording, and study of geologic features and structures by means of photography; specif. the geologic interpretation of aerial and space photographs and images and the presentation of the information so obtained. It includes the interpretation of second-generation photographs obtained by photographing images recorded on television-type tubes (the images recording wavelengths outside the visible spectrum).
Industry:Mining
The ignition of an explosive mixture of combustible gases and air in the undercut of a coal cutter due to frictional sparking. Combustible gases in dangerous quantities often exist in a machine undercut.
Industry:Mining
The immature chemistry of the Middle Ages, characterized by the pursuit of the transmutation of base metals into gold, and the search for the alkahest and the panacea.
Industry:Mining
The immersion of metal objects in an acid bath to remove scale, oxide, tarnish, etc., leaving a chemically clean surface for galvanizing or painting.
Industry:Mining
