- 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 ...
Broadly, various types of drill machines that rotate a rigid, tubular string of rods to which is attached a bit for cutting rock to produce boreholes. The bit may be a roller cone bit, a toothed or fishtail drag bit, an auger bit, or a diamond bit.
Industry:Mining
In an anticline, the line connecting the highest points on the same bed in an infinite number of cross sections.
Industry:Mining
Hollow pillars built up of logs laid crosswise for supporting heavy weights.
Industry:Mining
Exsolution lamellae in alkali feldspar visible only with the aid of a microscope.
Industry:Mining
Of 32 crystal classes (based on 32 point groups, the possible combinations of symmetry elements intersecting at a point) assigned to 7 crystal systems, only 11 are found in common minerals. Each system may be described in terms of three noncoplanar vectors (crystallographic axes) that are generally nonorthogonal as well. Although mineral assignment to a crystal system may require only examination of external crystal morphology, assignment of crystal class commonly requires X-ray diffraction analysis. 609 The crystal systems are triclinic, monoclinic, orthorhombic, tetragonal, trigonal, hexagonal, and isometric.
Industry:Mining
N. of Eng. A door, made of canvas, by which the ventilating current is regulated and directed through the workings.
Industry:Mining
In the cyanide process, the use of dissolved lime to maintain a slightly alkaline pulp, therefore ensuring that the cyanide salt retains its potency and does not acidify to hydrocyanic acid, which cannot dissolve gold or silver.
Industry:Mining
In laboratory tests on small quantities of ore, a method in which any selected fraction of the product is added to a fresh batch of the sample, so that the cumulative effect of its retention can be studied under conditions that simulate a continuous process in which middlings are recirculated or partly used water or leach liquor is returned.
Industry:Mining
Eng. Increasing the amount of air in mines to prevent explosions of mine gases.
Industry:Mining
