- المجال: Mining
- Number of terms: 33118
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- 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 name applied for transportation purposes to a device consisting of a detonator and an additional charge of explosives, assembled as a unit.
Industry:Mining
A name applied to a subgroup of pyrobitumens rich in oxygen and partly soluble in alkali. They resemble an earthy brown coal and probably represent a product of intense weathering of bitumens.
Industry:Mining
A name applied to certain types of apparatus worn by workers, permitting them to work in noxious or irrespirable atmospheres such as obtained during mine fires, following mine explosions, as a result of accidents in ammonia plants, from smelter fumes, etc. Oxygen compressed in a cylinder, a regenerating substance to purify the breathed air, and a closed system constitute the general principle of the apparatus.
Industry:Mining
A name applied to ledges of all kinds of rock that are shaped like steps or terraces. They may be developed either naturally in the ordinary processes of land degradation, faulting, and the like; or by artificial excavation in mines and quarries.
Industry:Mining
A name for a series of artificial orthorhombic fluoramphiboles having only half the adimension of anthophyllite. The presence of lithium and absence of calcium appear to be essential to their formation. Named because of a structural relation to protoenstatite.
Industry:Mining
A name for chlorastrolite (pumpellyite), esp. the green variety with patches of color; also, turquoise matrix or variscite matrix.
Industry:Mining
