- Industry: 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 ...
A very finely divided volcanic ash or volcanic dust ranging in color from white to gray and buff. It is the unconsolidated equivalent of tuff.
Industry:Mining
A very friable carbonaceous clay, with numerous slickensides and sometimes streaks of coal. Rashings may underlie, overlie, or be interstratified with the coal; a very weak material and breaks up around the face supports.
Industry:Mining
A very general principle applying to all forms of wave motion that states that every point on the instantaneous position of an advancing phase front (wave front) may be regarded as a source of secondary spherical wavelets. The position of the phase front a moment later is then determined as the envelope of all of the secondary wavelets (ad infinitum). This principle is useful in understanding effects due to refraction, reflection, diffraction, and scattering, of all types of radiation, including sonic radiation as well as electromagnetic radiation, and applying also to ocean wave propagation.
Industry:Mining
A very hard paving brick burned to the point of vitrification and toughened by annealing.
Industry:Mining
A very hard, tough, more or less cellular quartzite resembling French buhrstone and the most favored natural mill-lining material for most purposes. It is imported in rectangular blocks that are more or less shaped to fit the curve of a mill.
Industry:Mining
A very heavy hook designed to catch and tear out big roots when it is dragged along the ground.
Industry:Mining
A very heavy substance, common in the mines, Derbyshire, U.K. Also spelled cauk.
Industry:Mining
A very large grindstone employed in pulp mills for crushing or grinding wood into fiber.
Industry:Mining
A very plastic, tough, fine-grained impure clay, similar to Albany slip clay; used as a bonding and plasticizing agent in grinding wheels, refractories, etc., and as a suspension agent for glassy frit in vitreous enamels.
Industry:Mining
A very pronounced lineation, such as that produced by intersecting bedding and cleavage planes in slate.
Industry:Mining
