- 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 ...
Applied to the main stage of crystallization of silicates from a typical magma; the stage during which perhaps 90% of the magma crystallizes. Compare: pegmatitic stage
Industry:Mining
Applied to the ridges and hollows along the surface of dumped material (usually overburden) at an opencast mine. The undulations are leveled out when the land is restored.
Industry:Mining
Applied to the various processes involved in roofing slate manufacture, which include drilling and wedging, cutting, sawing, etc.
Industry:Mining
Applied to the wooden voussoirs used in framing a timber support for the tunnel roof, when driving a tunnel on the so-called American system. These blocks are made of plank, superimposed in three or more layers, and a breaking joint.
Industry:Mining
Applied to those sedimentary rocks that solidify from solution either by precipitation or by secretion.
Industry:Mining
Applied to widespread strata in the ocean that scatter or return vertically directed sound as in echo depth sounding. These layers, which are evidently of biological origin, are located at depths ranging from 150 to 200 fathoms (274 to 366 m) during the day, with most of them migrating to or near the surface during the night. Abbrev: dsl.
Industry:Mining
Applies to the dissolution of a solid in a liquid. The rate of dissolution is proportional to the surface area of the solid exposed to the action of the solvent.
Industry:Mining
