- 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 ...
A term loosely applied to any light-colored, coarse-grained plutonic rock containing quartz as an essential component, along with feldspar and mafic minerals.
Industry:Mining
A term loosely used to refer to either the two colors observable in a dichroic stone or the three colors in a trichroic stone.
Industry:Mining
A term loosely used to refer to either the two colors observable in a dichroic stone or the three colors in a trichroic stone.
Industry:Mining
A term meaning that not all of the fuel is oxidized to its highest degree; e.g., if carbon monoxide is formed instead of carbon dioxide. Compare: incomplete combustion
Industry:Mining
A term of wide application, referring to such aspects of rock units as rock type, mode of origin, composition, fossil content, or environment of deposition. Compare: lithofacies
Industry:Mining
A term originally applied to altered diabase in which the feldspar has been altered to saussurite, kaolin, and chlorite. This usage is obsolete, but the term is occasionally used for a light-colored hypabyssal rock, being the antithesis of lamprophyre. Not recommended usage.
Industry:Mining
A term originally used by German miners to indicate a band of sulfide impregnation in metamorphic rocks. The sulfides are too abundant to be classed as accessory minerals, but too sparse to form an ore lens. Fahlbands have a characteristic rusty-brown appearance on weathering.
Industry:Mining
A term proposed by Barth (1962) for the redistribution of granitizing materials within sediments by mobilization, transfer, and reprecipitation, as opposed to metasomatism involving addition of new materials.
Industry:Mining
