- 行业: 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 soft iron containing phosphorus, which makes very fine smooth castings and is used for ornaments and jewelry.
Industry:Mining
A soft slate, shale, or rock approx. 2 in (5.08 cm) to 2 ft (0.61 m) in thickness, above the coal, and which falls with the coal or soon after the coal is removed.
Industry:Mining
A soft yellowish mixture of alum with aluminum and iron oxides; a decomposition product of aluminous rocks. See: stone butter
Industry:Mining
A soft, bluish-white metal, similar in many respects to zinc, copper, and lead ores. Almost all cadmium is obtained as a byproduct in the treatment of these ores. Symbol, Cd. Used in electroplating, in solder, for batteries, as a barrier to control atomic fission, and in TV tubes. Cadmium and solutions of its compounds are toxic.
Industry:Mining
A soft, ductile, steel-white metallic element of the platinum group metals. Symbol, Pd. Found along with platinum and other metals of the platinum group in placer deposits; also found associated with nickel-copper deposits. Used as a catalyst, in dentistry, watchmaking, surgical instruments, and electrical contacts.
Industry:Mining
A soft, earthy, fine-textured, usually white to light-gray or buff limestone of marine origin. It consists almost wholly (90% to 99%) of calcite, formed mainly by shallowwater accumulation of calcareous remains of floating microorganisms (chiefly foraminifers) and of comminuted remains of calcareous algae, set in a structureless matrix of very finely crystalline calcite. The rock is porous, somewhat friable, and only slightly coherent.
Industry:Mining
A soft, earthy, typically clay-rich, thoroughly decomposed rock, formed in place by chemical weathering of igneous, sedimentary, and metamorphic rocks. It often forms a layer or cover as much as 100 m thick, esp. in humid and tropical or subtropical climates; the color is commonly some shade of red or brown, but it may be white or gray. Saprolite is characterized by preservation of structures that were present in the unweathered rock.
Industry:Mining
