- 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 ...
The working of steeply inclined coal seams, many features of which are comparable to metal mining.
Industry:Mining
The working of the top portion of a thick seam that was left as a roof when the bottom portion was worked. The top coal is recovered by working over the goaf or packs of the first working.
Industry:Mining
The working part of a pump, hydraulic cylinder, or engine that moves back and forth in the cylinder; it is generally equipped with one or several rings or cups to control the passage of fluid. It ejects the fluid from the cylinder, as in a pump, or receives force from the fluid, which causes a reciprocating motion, as in an engine.
Industry:Mining
The worldwide sea-level regime and its fluctuations, caused by absolute changes in the quantity of seawater, e.g., by continental icecap fluctuations.
Industry:Mining
The worth of a diamond as based on an individual sorter's interpretation of somewhat arbitrary standards of color, presence of flaws, soundness, and shape.
Industry:Mining
The yellow-brown variety of topaz changed to rose pink by heating. These crystals often contain inclusions of liquid carbon dioxide.
Industry:Mining
The yellowing of the leaves of plants, sometimes caused by a deficiency of iron necessary in the formation of chlorophyll. Has been useful as a guide to ore since nickel, copper, cobalt, chromium, zinc, and manganese are all antagonistic to iron in plant metabolism. Also may indicate where such toxins have been added to soil by industrial or other human activity.
Industry:Mining
The zinc-cadmium oxide that accumulates in the chimneys of furnaces smelting zinciferous ores.
Industry:Mining
The zinc-silver alloy skimmed from the surface of the bath in the process of desilverization of lead by zinc.
Industry:Mining
