- 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 term applied to alloys that increase in hardness when heated after rapid cooling; also to the operation of producing this. Also called artificial aging; distinguished from aging or age hardening, which occurs at atmospheric temperature. Both processes are covered by the term precipitation hardening
Industry:Mining
A term applied to any cutter loader that can cut both ways on a longwall face without turning at each end. This requires cutting units at both ends of the machine and duplication of other essential parts.
Industry:Mining
A term applied to coal deposits formed from submerged forests and driftwood.
Industry:Mining
A term applied to combustion in which all of the fuel is not burned; e.g., leaving unburned carbon in ashes. Compare: imperfect combustion
Industry:Mining
A term applied to hydraulic methods of excavating and transporting coal and other products underground.
Industry:Mining
A term applied to lapis lazuli (lazurite) and to other blue minerals such as lazulite and azurite.
Industry:Mining
A term applied to metals, such as lead, tin, and zinc, that recrystallize at air temperature and in which little strain hardening is produced by cold working.
Industry:Mining
A term applied to pegmatitic and aplitic dikes, the boundaries of which have been obliterated by continued growth of the minerals of the granite into which the dikes have been injected.
Industry:Mining
