- 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 ...
The tail end or receiving end of a belt conveyor. It consists of a return drum carried in a boxlike structure. A scraper, plow, or brush is attached to remove as much as possible of the spillage on the bottom belt before it passes on to the return drum. The tension end is drawn back by two sylvesters attached to staking anchor props; this enables adequate, but not excessive, tension to be imparted to the belt.
Industry:Mining
The taking down of a thickness of roof beds in roadways some distance back from the face. The thickness of roof excavated may vary from 1 ft (0.3 m) or so to 6 ft (1.8 m) and more. This work is necessary where there has been a gradual reduction in height, as a result of roof sag, and opening height must be maintained.
Industry:Mining
The taking of aerial photographs for making maps and for geologic interpretation.
Industry:Mining
The taking of air samples to assess their degree of dustiness, either on a mass basis or on particle count in a known volume of air. Numerous instruments have been developed for this purpose. Dust sampling is also necessary to assess the efficiency of stone dusting.
Industry:Mining
The taking of large samples, which may consist of large-diameter drill core, the contents of a trench or mine working, or a car or train load of ore material, for metallurgical testing in mine evaluation.
Industry:Mining
The tautline cableway differs from the aerial tramway in that its operation is limited to the distance between two towers (not more than 3,000 ft or 915 m apart), it has only one carrier, and the traction cable is reeved at the carrier so that loads can be raised and lowered. Also, the tautline cableway is not restricted to a fixed position; the towers can be mounted on trucks or crawlers, and the machine then can be shifted across a wide area. The machine will hoist loads from any point under the span, convey these loads in either direction, and lower these loads at any point under the span. By using movable towers, an area of any length can be traversed. Equipped with slings, this machine will pick up and carry unwieldy loads of every kind; then by exchanging the slings for a skip, it will handle large chunks of ore, stone, etc., or it can be equipped with a dump bucket to handle any bulk material, including semifluid mixtures.
Industry:Mining
The technique of flying at a constant height above the ground during airborne mineral exploration. Generally, the aircraft maintains a height of 300 ft or 500 ft (91 m or 152 m) above the ground. This often involves a series of skillfully controlled climbs and dives over rolling ground.
Industry:Mining
