- Industry: 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 ...
In the United States, a commonly used term for a granitic rock containing few, if any, dark minerals. The term is used to designate granitoid rocks in which quartz constitutes 20% to 60% of the felsic minerals and in which the ratio of alkali feldspar to total feldspar is greater than 90%; i.e., the equivalent of alkali granite. Alaskite is a commercial source of feldspar near Spruce Pine, NC. Compare: aplogranite
Industry:Mining
In the United States, a form of overhand stoping in which the general line of advance is up the dip. The benches are advanced in a line parallel with the drift. The method permits a large number of machines to be used but requires the miners to work under a comparatively dangerous back.
Industry:Mining
In the United States, a horizontal gallery driven in the hanging wall of a vein.
Industry:Mining
In the United States, a mining claim containing ore in veins or lodes, as contrasted with placer claims carrying mineral, usually gold, in alluvium.
Industry:Mining
In the Western United States, a prospector, esp. one who works and lives in the desert, or who has spent much time in arid regions. The name is derived from a small rodent common throughout much of the Great Basin and Southwestern United States.
Industry:Mining
In the Western United States, supplies or funds furnished to a mining prospector on promise of a share in his discoveries. So called because the lender stakes or risks provisions so furnished.
Industry:Mining
In theory, a log designed to measure the manner in which the energy of elastic waves is dissipated in passing through rock. Although no practical log of this type has yet evolved, the belief that a log of this parameter would permit the estimation of the permeability of formations would seem to ensure such a development since no log has been developed to record permeability.
Industry:Mining
In these methods, support for walls and for workers and machines is furnished by waste rock, tailing sand, etc., called filling or gob. In true waste filling, the orebody is excavated in sections alternating with filling, and it is sometimes referred to as cut-andfill stoping.
Industry:Mining
In these types, the quantities of liquid products are insufficient to render the mixture compressible. When packing cartridges, however, the same high density is obtained as with plastic explosives. The proportions of the various constituents are actually so arranged that the spaces between the grains are filled out. The proportions in question are determined entirely according to the constituents selected.
Industry:Mining
