- 行业: 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 ...
An oversized derby (possibly a ton or more) of a metal produced in a bomb reaction, such as uranium from uranium tetrafluoride and magnesium. The term ingot for these metals is reserved for massive nits produced in vacuum melting and casting.
Industry:Mining
An overthrust, the thrusted rocks of which move differentially so that the upper part of the geologic section is left behind; the replacement of the upper limb of an overturned anticline by a fold fault.
Industry:Mining
An overthrust, the thrusted rocks of which move differentially so that the upper part of the geologic section is left behind; the replacement of the upper limb of an overturned anticline by a fold fault.
Industry:Mining
An overturned fold, the axial surface of which is horizontal or nearly so.
Industry:Mining
An oxidation process used for fire refining bismuth, gold, and silver; the crude metals are melted down with oxidizing fluxes, so that the impurities are oxidized during the melting period and become part of the slag.
Industry:Mining
An oxide of aluminum, Al<sub>2</sub>O<sub>3</sub>; the mineral corundum; an important constituent of clay minerals, Al<sub>2</sub>Si<sub>2</sub>O<sub>5</sub>(OH)<sub>4</sub>, determining their suitability for firebrick and furnace linings. Synthetic alumina is used as the feed material in aluminum smelters; it is also used in the preparation of paints called lakes, in dyeing, and in calico printing; in granular form it is used for abrasives and grinding or cutting tools of high tensile strength. Most alumina is made via the Bayer process from hydrated aluminum oxides, as found in bauxite, diaspore, and gibbsite. Aluminum oxide can also be made in an electric furnace by fusing bauxite or corundum. Suitably doped alumina is the feed material for boules of synthetic ruby and sapphire made by the Verneuil flame-fusion process. Fused alumina is crushed and used as an abrasive, a refractory, a heating element for electrical heaters, and as a filtering medium.
Industry:Mining
An oxygenated hydrocarbon from the Great Western mercury mine, Lake County, CA. It occurs in plates and nodules, sometimes brittle, occasionally hard; the color is light green to reddish-brown; and sp gr, 0.85 to 0.985.
Industry:Mining
