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United States Bureau of Mines
업종: 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 ...
A drift excavated in rock, such as from the surface down to a coal seam.
Industry:Mining
A drift in an orebody, equipped wth a scraper loader, for loading ore directly into cars in the haulage level. The drift is formed at right angles to the haulage level and over it so that the ore drops into the cars.
Industry:Mining
A drift inclined along the dip of a coal seam.
Industry:Mining
A drift or adit connected to a shaft from a point on the surface at a lower level than the shaft top and used as an outlet into which mine pumps discharge, so reducing the height through which the water must be lifted.
Industry:Mining
A drift or adit connected to a shaft from a point on the surface at a lower level than the shaft top and used as an outlet into which mine pumps discharge, so reducing the height through which the water must be lifted.
Industry:Mining
A drift or heading driven in barren and hard rock.
Industry:Mining
A drift or opening driven at an angle of about 45 degrees to the strike and in the plane of the seam.
Industry:Mining
A drift that is driven in an ore deposit for the purpose of exploring the deposit both horizontally and vertically to see whether it will be worth working.
Industry:Mining
A drill bit in which the diamond-set crown is formed on a bit blank by pouring molten metal into a prepared mold.
Industry:Mining
A drill bit in which the diamond-set crown is formed on a bit blank by pouring molten metal into a prepared mold.
Industry:Mining
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