- 行业: Mining
- Number of terms: 33118
- Number of blossaries: 0
- 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 moisture content retained at equilibrium in an atmosphere over a saturated solution of potassium sulfate at 30 degrees C, and 96% to 97% relative humidity. When the sample, before such equilibrium, contains total moisture at or above the equilibrium moisture, the equilibrium moisture may be considered as equivalent to inherent or bed moisture, and any excess may be considered as extraneous moisture.
Industry:Mining
The mold or container in which molten metal is cast and allowed to solidify in order to form an ingot.
Industry:Mining
The moment of inertia of an area about either principal axis.
Industry:Mining
The monetary value of a mineral or rock product per ton or other unit of measurement.
Industry:Mining
The most common phosphoric acid dihydrate process for phosphoric acid production using sulfuric acid with naturally occurring phosphate rock.
Industry:Mining
The most common type of sandstone, intermediate in composition between orthoquartzite and graywacke (Pettijohn, 1957). Composition is typically 30% to 65% quartz and chert, less than 15% clay matrix, more than 25% unstable materials such as feldspar grains and rock fragments, and voids or mineral cement exceeding the amount of clay matrix. The rock is lighter colored and better sorted, and has less matrix, than graywacke. Compare: graywacke
Industry:Mining
The most common type of steam winder is the two-cylinder double-acting horizontal engine driving direct on the drum shaft. These engines, which are made with cylinders up to 42 in (1.1 m) in diameter and with a 84-in (2.1-m) stroke, possess the merit of simplicity and ease of control. The two cylinders act on cranks set at 90 degrees to each other and are large enough for either to start the engine from rest against a full load, since one may happen to stop at dead center (i.e., with the piston at the end of its stroke, in which position it can exert no turning moment on the crank).
Industry:Mining
The most complete sheathing using wood timbering. Used where water or fine wet soils must be retained. The frame is designed for this use and is generally stronger than that required for other types of sheathing. A specially edged plank, generally tongue-andgrooved, eliminates the crevices existing in close sheathing. Compare: close sheathing; skeleton sheathing.
Industry:Mining
