- 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 arithmetic average of a series of values; esp. arithmetic mean. Compare: mode
Industry:Mining
An arkosic sandstone basal to a sedimentary sequence, resting unconformably on a granitic terrane; the arkosic equivalent of a granitic basal conglomerate.
Industry:Mining
An arrangement by which a gear level can be moved, but the resulting speed shift will not take place until the clutch or the throttle is manipulated.
Industry:Mining
An arrangement by which colliers are paid an agreed sum for removing a dirt band, in addition to the usual tonnage rate. The payment varies with the thickness of the band.
Industry:Mining
An arrangement by which molten lead from the crucible of a shaft furnace is drawn through an inverted siphon into an exterior basin from which it can be ladled without disturbing the furnace.
Industry:Mining
An arrangement by which molten lead from the crucible of a shaft furnace is drawn through an inverted siphon into an exterior basin from which it can be ladled without disturbing the furnace.
Industry:Mining
An arrangement composed of flocs of soil particles instead of individual soil particles.
Industry:Mining
An arrangement composed of individual soil particles; characteristic structure of coarsegrained soils.
Industry:Mining
An arrangement for lifting gravel and sand up to the drainage level. A jet of water is used to create a powerful suction in a hopper, and the water and gravel are carried up a pipeline and then run down the sluice boxes. This appliance was widely used in various goldfields toward the end of the 19th century.
Industry:Mining
