- 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 declivity from the offshore border of the insular shelf at depths of from 50 to 100 fathoms (300 to 600 ft or 91 to 183 m) to oceanic depths. It is characterized by a marked increase in gradient.
Industry:Mining
The decrease in pressure at which a liquid or gas is made to move between the intake and discharge of a pipeline or drill stem.
Industry:Mining
The decrease in volume per unit volume produced by a unit change of pressure.
Industry:Mining
The deduction made from a measured length of a base line to establish its true length at sea level.
Industry:Mining
The deduction of a specific angular value from the apparent angle, as indicated by the plane of the etch line in an acid-survey bottle, to correct for capillarity effects and thereby determine the true inclination angle of a borehole. Proper values to be deducted from the apparent angles read on acid bottles differing in size may be determined by referring to charts, graphs, or tables prepared for that purpose.
Industry:Mining
The deep waters of the ocean below 1,000 fathoms or 6,000 ft (1.83 km).
Industry:Mining
The deflection of a ray of light or of an energy wave (such as a seismic wave) due to its passage from one medium to another of differing density, which changes its velocity. Compare: reflection; diffraction.
Industry:Mining
The deformation of the coal or ore pillars is estimated by monitoring the closure of the entry. This roof-to-floor convergence is generally measured with a tube extensometer, to an accuracy of 0.001 in (25.4 mu m), or a tape measure, to an accuracy of 0.01 ft (3.048 mm). Measurements are repeatedly taken as the mining geometry changes.
Industry:Mining
The degree of agreement or uniformity of repeated measurements of a quantity; the degree of refinement in the performance of an operation or in the statement of a result. It is exemplified by the number of decimal places to which a computation is carried and a result stated. Precision relates to the quality of the operation by which a result is obtained, as distinguished from accuracy, but it is of no significance unless accuracy is also obtained.
Industry:Mining
