- Industry: Mining
- Number of terms: 33118
- Number of blossaries: 0
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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 foundry work, loosening of pattern before its withdrawal from molding sand in flask.
Industry:Mining
In froth flotation, the prevailing balance of chemical energy reached by the reacting electrical, physical, and chemical forces.
Industry:Mining
In froth flotation, a slanted board used to direct the rising mineralized froth toward the overflow lip of the cell.
Industry:Mining
In froth flotation, treatment of one or more species of mineral particles to reduce their tendency to float.
Industry:Mining
In fully mechanized coal mining, a system of pit props connected to a flexible armored conveyor by means of hydraulic rams.
Industry:Mining
In gemology, an instrument that affords a magnified image of the drill hole of a pearl, used to distinguish between genuine and cultured pearl. A tiny beam of light is directed into the walls of the drill hole to reveal whether the structure of the pearl's core is concentric (genuine) or parallel (cultured).
Industry:Mining
In gemology and optical mineralogy, total reflection occurs in a transparent solid where a light ray strikes the surface of a medium of lower refractive index at any angle greater than its critical angle as defined sin r = 1/n, where r is the critical angle and n is the refractive index of the solid (or n<sub>2</sub>/n<sub>1</sub>, where n<sub>1</sub>represents the lower refractive index if other than 1 for air). Compare: critical angle; reflection; law of refraction.
Industry:Mining
In general, any figure differing but little from a sphere. In geodesy, a mathematical figure closely approaching the geoid in form and size, and used as a surface of reference for geodetic surveys.
Industry:Mining
In general, a coal seam over 2 ft (0.6 m) and up to 4 ft (1.2 m) in thickness.
Industry:Mining
In geochemical exploration, a collective term for the abnormal colors and morphological features of a plant caused by a poisonous element in the nutrient solution.
Industry:Mining
