- Industry: 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 ...
Coarsely crystalline quartz containing inclusions of asbestiform amphibole, esp. hornblende or actinolite, that may be tangled or wound into a ball.
Industry:Mining
Porosity due to vugs in calcareous rock. The term vugular is used by some writers but condemned by others.
Industry:Mining
In concentration on shaking table, the movement of a segregated band of mineral so that it no longer discharges from the table deck at the desired point and therefore is not correctly collected.
Industry:Mining
In coal washing this may be expressed as: Efficiency, percent = Actual yield of clean coal X 100 / Theoretical yield at the ash content of the clean coal. The efficiency of separation thus expresses as a percentage, that proportion of the float coal obtained by float-and-sink analysis that will be recovered in practice by a particular washer. The theoretical yield is derived by plotting the cumulative yield of the reconstituted feed coal against the appropriate cumulative ash content and reading off the yield corresponding to the ash content of the clean coal actually obtained.
Industry:Mining
Overburden, nonore, or other waste material removed in mining, quarrying, dredging, or excavating.
Industry:Mining
Glass spheroid, often with aerodynamic shape, found in strewn fields and associated with impact craters; each cluster of tektites is named for its locality, such as moldavites and australites. A tektite has been shaped by flight through the atmosphere while chilling and ablating and melted by meteorite impact.
Industry:Mining
Pulley in headgear of the winding shaft over which the hoisting rope runs.
Industry:Mining
In general, a cycle refers to any series of changes or operations in which any part of the system return to its original state or position. In winding, the term usually refers to a complete wind, which is comprised of three phases: (1) acceleration to full speed; (2) full-speed running; and (3) retardation to rest. The period of the winding cycle is the sum of winding time and decking time in seconds.
Industry:Mining
Made of specially formed wires assembled in layers of alternate lay about a wire core, which gives a smooth rope, and the entire surface is available for resisting wear. Such ropes are used in the United States for track cables on aerial tramways, and in England as hoisting ropes collieries.
Industry:Mining
Long-established and widely used form of shaking table; rectangular; mounted horizontally and can be sloped about its long axis. It is covered with linoleum (occasionally rubber) and has longitudinal riffles tapering at the discharge end to a smooth cleaning area, triangular in the upper corner. A compound eccentric is used to create a gentle and rapid throwing motion on the table, longitudinally. Sands, usually classified for size range, are fed continuously and worked along the table with (1) the aid of feedwater, and (2) across riffles downslope by gravity tilt adjustment and added wash water. At the discharge end, the sands have separated into bands: the heaviest and smallest uppermost; the largest and lightest lowest. The Dodd, Cammet, Hallett, and Woodbury are similar types of tables.
Industry:Mining
