- 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 steel bowl hung within a fabricated steel frame, running on four or two wheels. Its bottom edge digs into the ground, the bowl being filled as it is drawn forward by a tractor; soil is ejected at the dump by a tailgate, moved by wire ropes or hydraulically. Towed scrapers transport soil, in addition to spreading and leveling it.
Industry:Mining
A steel chain mat suspended from the roof about 9 to 12 ft (2.74 to 3.66 m) from the face of an advancing tunnel to limit damage to equipment and danger from flying debris when shot firing at the face. It consists of a steel frame with chains suspended about 6 in (15 cm) apart.
Industry:Mining
A steel chisel-edged chopping bit having a longer and heavier-than-normal shank, designed to give added weight and directional stability when chopping an angle hole through overburden.
Industry:Mining
A steel containing alloys that provide special properties, such as resistance to corrosion or to heavy load.
Industry:Mining
A steel containing alloys that provide special properties, such as resistance to corrosion or to heavy load.
Industry:Mining
A steel containing approx. 15% chromium and 9% copper; claimed to be resistant to corrosion in the atmosphere and to tap water, but its corrosion-resistant properties are inferior to the conventional austenitic chromium-nickel steels of the 18-8 type.
Industry:Mining
A steel door specially erected for the purpose of being closed only in an emergency, such as a fire or an explosion. Steel is necessary for strength and to avoid destruction by fire. Steel doors may also be used as separation doors in the vicinity of the pit bottom or fan drift.
Industry:Mining
A steel door specially erected for the purpose of being closed only in an emergency, such as a fire or an explosion. Steel is necessary for strength and to avoid destruction by fire. Steel doors may also be used as separation doors in the vicinity of the pit bottom or fan drift.
Industry:Mining
A steel door specially erected for the purpose of being closed only in an emergency, such as a fire or an explosion. Steel is necessary for strength and to avoid destruction by fire. Steel doors may also be used as separation doors in the vicinity of the pit bottom or fan drift.
Industry:Mining
A steel face support structure consisting of from one to four hydraulic legs or uprights. The four-leg chock is mounted in a strong fabricated steel frame with a large head and base plate. It is controlled by a central valve system that operates either on the four legs simultaneously or on the front and rear pairs separately.
Industry:Mining
