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United States Bureau of Mines
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 ...
A mineral deposit consisting of a zone of veins, veinlets, disseminations, or planar breccias; a mineral deposit in consolidated rock as opposed to a placer deposit.
Industry:Mining
A mineral deposit consisting of a zone of veins, veinlets, disseminations, or planar breccias; a mineral deposit in consolidated rock as opposed to a placer deposit.
Industry:Mining
A mineral deposit formed at moderate temperature and pressure, in and along fissures or other openings in rocks, by deposition at intermediate depths, from hydrothermal fluids. Mesothermal deposits are believed to have formed mostly between 175 degrees C and 1954 300 degrees C at depths of 4,000 to 12,000 ft (1,220 to 3,660 m). Many valuable metalliferous deposits of western North America are of this type.
Industry:Mining
A mineral deposit formed when a primary mineral deposit is subjected to alterations through chemical and/or mechanical weathering. Secondary deposits are divided into three groups: sedimentary rocks, secondarily enriched mineral deposits, and residual or detrital mineral deposits.
Industry:Mining
A mineral deposit found in a deeply eroded mass of intrusive rock with few roof pendants remaining.
Industry:Mining
A mineral deposit in a vein space formed by bulging of the walls, contrasted with veins formed by wall-rock replacement.
Industry:Mining
A mineral deposit of irregular shape.
Industry:Mining
A mineral deposit of such unusual grade, mineralogy, or geologic setting that experienced mining personnel would not consider it to be similar to any known deposit type.
Industry:Mining
A mineral deposit that has been formed by deposition from mineral solutions taking the place of some earlier, different substance.
Industry:Mining
A mineral deposit that is generally stratiform, more or less horizontal, and areally extensive relative to its thickness.
Industry:Mining
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