- 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 ...
Applied to all petrologic units seen in microscopic sections of coal, as distinct from the visible units seen in the hand specimens. Comparable in rank to mineral as used in petrography. Thus, macerals are organic units composing the coal mass, being the 1865 descriptive equivalent of the inorganic units composing rock masses and universally called minerals. Individual macerals have the termination -inite; i.e., vitrinite, as the organic unit making up the lithologic specimen, vitrain. Three groups are recognized: (1) vitrinites; (2) exinites; and (3) inertinites.
Industry:Mining
Applied to an advance gate that carries forward a waste or skip, from 6 to 10 yd (5.5 to 9.1 m) wide, to take all the broken rock produced by the gate rippings. A short face conveyor is usually used to move the coal and dirt as required. The width of the waste is just sufficient for stowing the dirt produced.
Industry:Mining
Applied to any definite signal change or amplitude difference on a seismic record. It may be a reflection, a refraction, a diffraction, or a random signal.
Industry:Mining
Applied to black sand leads on coastlines which are above high-water mark.
Industry:Mining
Applied to certain unstable atoms, the nuclei of which spontaneously disintegrate, emitting particles and rays, eventually reverting through a series of such emissions into an atom having a stable nucleus and a different atomic number. Radium, e.g., becomes lead-207.
Industry:Mining
Applied to chemical reactions conducted on the stage of a microscope and viewed through the microscope.
Industry:Mining
Applied to coal consumed by ocean steamers, tugs, ferryboats, or other steam watercraft.
Industry:Mining
Applied to coal consumed by ocean steamers, tugs, ferryboats, or other steam watercraft.
Industry:Mining
Applied to combustion units in which forced and induced drafts are adjusted to give atmospheric pressure in the combustion chamber to avoid the infiltration of unwanted cold air.
Industry:Mining
