- 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 ...
An arrangement of alternate packs and wastes built in a direction parallel to the gate roads in longwall conveyor mining. A common practice is to allow 5-yd (4.5-m) wastes between 4-yd (3.7-m) packs, or both are made 5 yd wide. The dimensions vary with local conditions.
Industry:Mining
An arrangement of checkerbrick such that each course of brick is laid in spaced parallel rows with the brick end to end; each alternate course above and below has its parallel rows at right angles to the intervening course.
Industry:Mining
An arrangement of closed pipes and valves to conduct water from one level to a lower level over an intervening ridge. The difference of level between the inlet and outlet ends of the pipe column must be sufficient to provide a head great enough to overcome the frictional resistance of the pipe column. The siphon was often used in the earlier days of mining when pumps were too costly or power was not available.
Industry:Mining
An arrangement of connecting airways in a mine together with the pressure sources and control devices that produce and govern airflow.
Industry:Mining
An arrangement of elements based on the periodic law and proposed in various forms that are usually either short with only short periods (as in Mendeleev's original table) or long with long as well as short periods (as in most modern tables).
Industry:Mining
An arrangement of idler rollers on a conveyor in which the top set is mounted on vertical arms which pivot on spindles set low down on the frame of the roller stool. This permits the entire carrier frame to lean forward slightly in the direction of belt travel. In the event of the belt not running true, the tilting idlers guide it back to its correct course again.
Industry:Mining
An arrangement of metamorphic minerals in order of decreasing form energy, so that crystals of any of the listed minerals tend to assume idioblastic outlines at surfaces of contact with simultaneously developed crystals of all minerals occupying lower positions in the series.
Industry:Mining
An arrangement of overhead cable supporting a traveling carriage from which is suspended a skip or container that can be lowered and raised at any desired point.
Industry:Mining
An arrangement of pulleys and rope that enables heavy weights to be lifted with least effort.
Industry:Mining
An arrangement of scraper boxes with cutting knives attached to the face side.
Industry:Mining
