- المجال: 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 mineral deposit that originated from hot, ascending aqueous solutions derived from a magma. Compare: hypothermal deposit
Industry:Mining
A mineral deposition process in which near-surface oxidation produces acidic solutions that leach metals, carry them downward, and reprecipitate them, thus enriching sulfide minerals already present.
Industry:Mining
A mineral deposition process in which near-surface oxidation produces acidic solutions that leach metals, carry them downward, and reprecipitate them, thus enriching sulfide minerals already present.
Industry:Mining
A mineral deposition process in which near-surface oxidation produces acidic solutions that leach metals, carry them downward, and reprecipitate them, thus enriching sulfide minerals already present.
Industry:Mining
A mineral developed under a particular set of temperature and pressure conditions, thus characterizing a particular degree of metamorphism. When dealing with progressive metamorphism, it is a mineral whose first appearance (in passing from low to higher grades of metamorphism) marks the outer limit of the zone in question. Compare: typomorphic mineral
Industry:Mining
A mineral distinguished from others by its unique chemical and physical properties; it may have varieties.
Industry:Mining
A mineral exhibiting very irregular rounded surfaces, often giving rise to gnarled, rootlike shapes.
Industry:Mining
A mineral formed at the same time as the rock enclosing it, by igneous, hydrothermal, or pneumatolytic processes, and that retains its original composition and form. Compare: secondary mineral
Industry:Mining
