- 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 ...
The thermal emissivity, or heat transfer coefficient, of a rock surface is the rate at which heat will flow from rock to air, per unit area for 1 degree temperature difference. This varies with color and other surface characteristics. Measured in W/m<sub>2</sub>.K.
Industry:Mining
The thickest oolitic bed in the Carboniferous limestone of the Clee Hills, Shropshire, United Kingdom.
Industry:Mining
The thickness of ore measured at right angles to the dip. The term "true width" is often used to describe this value, in which case width of lode is used to denote the thickness passed through, irrespective of the angle of dip.
Industry:Mining
The thin cavities formed along bedding planes due to differential lowering of strata over mine workings; e.g., a shale with its greater bending capacity will subside and separate from a higher bed of sandstone. Roof supports are so set as to keep bed separation to a minimum.
Industry:Mining
The thin vitrainlike bands present in clarain, having a maximum thickness of about 1/10 in (2.5 mm) with a tolerance of 1 mm, and a minimum thickness of 0.05 mm (50 mu m).
Industry:Mining
The thinnest recognizable layer in a sedimentary rock. Plural, laminae. Compare: stratum
Industry:Mining
The Third Theory states that the specific work input required for size reduction is inversely proportional to the square root of the product size, less the work required to form the feed.
Industry:Mining
