- 行业: 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 ...
Primary coil that is used in inductive methods to set up electric currents in the Earth.
Industry:Mining
Primary folding in migmatites (injection gneisses, etc.), caused by the high-temperature and high-pressure processes to which the migmatites owe their origin and composite character. Compare: flow folding
Industry:Mining
Primary, or leading function. A principal axis is the longest one in a crystal. The principal valence is that at which an element forms the greatest number of stable compounds.
Industry:Mining
Principal ore minerals are zircon and baddeleyite. Main uses are as refractories, ceramics, opacifiers, abrasives, enamels, insulators, and alloys. They are also a source of hafnium. Transparent zircon is a gemstone.
Industry:Mining
Probable gross profit from a mine's ore reserves, as distinct from the ground still to be blocked out.
Industry:Mining
Probably Ni<sub>2</sub>FeAs<sub>2</sub>; hexagonal. From Josephine Creek, Josephine County, OR. Named from the locality. Also spelled oregonit.
Industry:Mining
Procedure for loading coal in railroad cars in horizontal layers. Layer-loading is a simple and inexpensive method for smoothing out the irregularities in coal and consists in shuttling two to six railroad cars, hooked together, past the loading boom two or more at a time. This results in a more uniform product.
Industry:Mining
Procedures intended to produce an accuracy such that if a large number of samples are taken from a single lot of coal, 95 out of 100 test results will be within + or - 10% of the average of these samples.
Industry:Mining
Process for recovering alumina from red mud by mixing it with soda ash (Na<sub>2</sub>CO<sub>3</sub>) and ground limestone, and sintering in a rotary kiln at temperatures of 1,800 to 2,000 degrees F (980 to 1,090 degrees C). This breaks up the sodium aluminum silicate and forms an insoluble calcium silicate and sodium aluminate. The sinter is leached with water to recover the sodium silicate, which is then treated in the same way as in the standard Bayer process.
Industry:Mining
Process for removing arsenic, antimony, tin, and zinc from virgin or secondary lead by agitating the molten metal with molten caustic soda and salt. All undesirable metals are oxidized, and the oxides are dissolved in the caustic, with the exception of silver, which is removed in a subsequent desilvering operation.
Industry:Mining
