- 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 ...
A process of magmatic emplacement or intrusion that involves detaching and engulfing pieces of the country rock. The engulfed material presumably sinks downward and/or is assimilated.
Industry:Mining
A process of metamorphism that involves the fracture, rupture, and rolling out of rock and mineral particles. In some instances, the crystal structure may be preserved, but the orientation of the fragments becomes confused. In other instances, the rock may be thoroughly pulverized.
Industry:Mining
A process of mining by which the ore, or coal, is untouched until after all the gangways, etc., are driven, when the work of extraction begins at the boundary and progresses toward the shaft. Compare: mining advancing
Industry:Mining
A process of producing precision castings of steel or steel alloys, which comprises first forming the steel or steel alloy in molten form by the aluminothermic process, by igniting a mixture of iron ore and aluminum; then running the molten metal into a mold prepared by packing a refractory mold composition around a model made of wax or other comparatively low-melting-point substance and heating to melt out the wax and consolidate the mold; and finally centrifuging the mold.
Industry:Mining
A process of removing magnetic materials from relatively nonmagnetic materials, using electromagnets which travel along a conveyor, over a drum, or into a revolving screen.
Industry:Mining
A process of rendering the surface of steel or iron resistant to oxidation by spraying the surface with aluminum and heating to a temperature of 800 to 1,000 degrees C.
Industry:Mining
A process of re-solution in which an early formed phase, such a quartz phenocryst, later becomes corroded or embayed as the result of some change in the conditions affecting the solubility of the phase; sometimes corrosion rims result.
Industry:Mining
A process of re-solution in which an early formed phase, such a quartz phenocryst, later becomes corroded or embayed as the result of some change in the conditions affecting the solubility of the phase; sometimes corrosion rims result.
Industry:Mining
A process of rock bolting in flat-lying deposits where the bolts are installed in bedded rock to bind the strata together to act as a single beam capable of supporting itself and thus stabilizing the overlying rock.
Industry:Mining
A process of rotary drilling in which the drilling fluid is kept under pressure in an enclosed system.
Industry:Mining
