- المجال: Mining
- Number of terms: 33118
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- 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 setscrew-equipped, universal-type clamp from one side of which a slotted angle-iron wand, about 18 in (45.7 cm) long, extends outward from a clamping device at 90 degrees . May be made to fit any size drill rod and is used in pairs, leapfrog fashion, to orient successive rods in a specific compass direction as these are lowered into a borehole being surveyed by the acid-bottle method. By this means, the bearing and inclination of a drill hole may be determined in formation or under conditions where a Maas- or other-type magnetic compass cannot be used.
Industry:Mining
A settling hole or basin that prevents water-borne soil from entering a pond or drainage system.
Industry:Mining
A settling tank for clarifying washer circulating water or for concentrating gold slimes before cyaniding. The tank may have a continuously working rake that moves the sludge toward the outlet pipe in the bottom.
Industry:Mining
A shaft driven esp. to permit egress from the mine in case of emergency.
Industry:Mining
A shaft employed solely for the hoisting of workers and materials to and from underground.
Industry:Mining
A shaft excavated as a cylinder. The circular shaft is equally strong at all points; convenient for concrete lining and tubbing, both of which can be made relatively watertight; and offers the least resistance to airflow.
Industry:Mining
A shaft excavated to an oblong shape. The majority of shafts sunk in the Republic of South Africa before 1948 were rectangular and timber lined. The shape lends itself to equipping concurrently with sinking; it provides a convenient in-line hoisting arrangement and can easily be divided into separate compartments. However, in the 1950's and 1960's developments were towards the concrete lined circular shaft.
Industry:Mining
A shaft furnace in which solid fuel is burned with an airblast to smelt ore in a continuous operation.
Industry:Mining
A shaft furnace used in melting pig iron (with or without iron or steel scrap) for iron castings. Metal, coke, and flux (if used) are charged at the top, and air is blown in near the bottom.
Industry:Mining
