- 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 ...
Where two or more veins unite, the oldest or prior location takes the vein below the point of union, including all the space of intersection.
Industry:Mining
While other nickel-cadmium batteries generally adopt either tubular or pocketed positive plate construction, the Wolf battery has individual features of interest. The supporting medium for the active materials consists of strips of compressed corrugated nickel foil. The method of construction is to perforate strips of the foil, which are pasted with active material. The strips are folded into corrugations and compressed into a cake. Two or more cakes are mounted in a pure nickel frame to form the finished plate. This method of construction results in a plate of satisfactory electrical conductivity, and no admixture of graphite or flake nickel in the active material is necessary.
Industry:Mining
White sand with large spheroidal masses of calciferous sandstone called sand ballers or giants' marbles, some being 3 to 6 ft (approx. 1 to 2 m) in diameter. (Possibly a variant of "bollars," a dialect form of boulders.)
Industry:Mining
White; amorphous; ZnS<sub>2</sub>O<sub>4</sub>; and soluble in water. Used as a depressant in flotation.
Industry:Mining
White; crystalline; NH<sub>2</sub>CN . Formed variously by the action of cyanogen chloride on ammonia.
Industry:Mining
White; hexagonal; ZnCl<sub>2</sub>; poisonous. Obtained by the solution of zinc, or zinc oxide, in hydrochloric acid, or by burning zinc in chlorine. Used in galvanizing iron, as a catalyst, as a dehydrating agent, as a condensing agent, as a wood preservative, as an ingredient in soldering fluxes, in burnishing and polishing compounds for steel, in electroplating, in glass-etching compositions, in petroleum refining, and in pigments.
Industry:Mining
White; symbol, BN; hexagonal rhombohedral, crystals or powder; the powder has a Mohs hardness of 2; sublimes at about 3,000 degrees C; anisotropic; some properties vary according to the method of preparation and the crystal form. Used as a refractory; a high-temperature lubricant, as in glass molds; in furnace insulation; and in molten-metal pump parts.
Industry:Mining
Whole-stone diamonds having outside faces that are smooth as contrasted to the pebbly, encrusted surface of a Congo diamond; also applied to diamonds produced in South African mines as contrasted to those found in the Sierra Leone, Congo, Brazil, etc.
Industry:Mining
Widely distributed crystallization of sparry carbonates, such as calcite and dolomite; development of relatively large sparry crystals that have good cleavage.
Industry:Mining
