- 行业: 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 ...
A general, nongeneric term for any linear structure in a rock; e.g., flow lines, slickensides, linear arrangements of components in sediments, or axes of folds. Lineation in metamorphic rocks includes mineral streaking and stretching in the direction of transport, crinkles and minute folds parallel to fold axes, and lines of intersection between bedding and cleavage, or of variously oriented cleavages.
Industry:Mining
A general, nongeneric term for any rock suitable for use in construction. Whether igneous, metamorphic, or sedimentary, a building stone is chosen for its properties of durability, attractiveness, and economy.
Industry:Mining
A generalization that states that, in a vertical sequence at any given point in the coalfield, the rank of the coal of the successive seams rises with increasing depth. Although this statement is generally true, there are numerous departures from it.
Industry:Mining
A generally narrow plain formed by sheetflood deposition of fine sandy clay or adobe brought down by an ephemeral stream, and having a smooth, hard surface (when dry) usually unmarked by stream channels.
Industry:Mining
A generally olivine-free extrusive rock composed of melilite and clinopyroxene (or other mafic mineral) usually comprising more than 90% of the rock, with minor amounts of feldspathoids and sometimes plagioclase.
Industry:Mining
A generic term for a group of synthetic fiber-forming polyamides. The polymer is melted, extruded, stretched, and finally processed to turn it into a textile yarn having a very high strength, great powers of energy absorption, and high resistance to abrasion and rotting. Its major uses in mining are as a reinforcement for conveyor belting and ventilation ducting.
Industry:Mining
A generic term for class of hydrated silicates of aluminum and either sodium or calcium or both, of the type Na<sub>2</sub>O.Al<sub>2</sub>O<sub>3</sub>.nSiO<sub>2</sub>.xH<sub>2</sub>O . The term originally described a group of naturally occurring minerals. The natural zeolites are analcite, chabazite, heulandite, natrolite, stilbite, and thomsonite. Artificial zeolites are made in a variety of forms, ranging from gelatinous to porous and sandlike, and are used as gas adsorbents and drying agents as well as water softeners. Both natural and artificial zeolites are used extensively for water softening. The term zeolite now includes such diverse groups of compounds as sulfonated organics or basic resins, which act in a similar manner to effect either cation or anion exchange.
Industry:Mining
A generic term for injury caused by pressure. Although squeeze is a colloquialism, it is an excellent descriptive term for all of the phenomena that occur when a rigid closed space within the body or on its surface fails to equalize with external pressure during descent, or is for some reason vented to lower pressure than that acting at the depth.
Industry:Mining
A generic term that sometimes includes all supervisory officials in a mine; a supervisor of a small group of miners usually working under a certified foreman.
Industry:Mining
A genetic term applied to igneous rocks with an orbicular texture in which the nuclei of the orbicules are formed of inclusions of the same generation as the groundmass. Compare: isothrausmatic; heterothrausmatic; crystallothrausmatic.
Industry:Mining
