- 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 ...
The amount of surface air entering a fan through the casing at the top of the upcast shaft, the airlock doors, and the fan-drift walls. The extent of leakage will depend on the fandrift water-gage method of construction, the number and type of entrances, and whether the upcast shaft is used for winding. The surface leakage at airlocks may vary from about 25,000 ft <sub>3</sub>/min (708 m<sub>3</sub>/min) at 5-in (12.7-cm) water gage to about 55,000 ft<sub>3</sub>/min (1,557 m<sub>3</sub>/min) at 25-in (63.5-cm) fan-drift water gage.
Industry:Mining
The amount of undercutting that can be done at one setting of a coal mining machine, usually about 5 ft (1.5 m), without moving forward the board upon which the machine works.
Industry:Mining
The amount paid by the smelter or other purchaser per ton of ore mined.
Industry:Mining
The amount, expressed in feet or degrees, a borehole has digressed horizontally from the intended target.
Industry:Mining
The analysis formulated by Coulomb in 1776 of the force tending to overturn a retaining wall. Its basis is the weight of the wedge of earth that will slide forward if the wall fails.
Industry:Mining
The analysis of fabric on the thin-section or micro scale. It includes the study of grain shapes and relationships (microstructure) and the study of crystallographic preferred orientations. The transmission electron microscope is also employed to examine the substructures of deformed crystals.
Industry:Mining
The anchor for a track cable, or the turn point for a backhaul line in a cable excavator.
Industry:Mining
The angle across the water phase of an air-water-mineral system, used to measure effect of surface conditioning.
Industry:Mining
The angle at a given point in the plane of a rectangular coordinate system between the central meridian, or a line parallel to it, and a straight line to the azimuth point.
Industry:Mining
The angle at which the leading surface of a cutting plane or point meets the surface to be cut. If less than 90 degrees , the angle is said to be negative; if over 90 degrees , it is called a positive rake or drag angle. Compare: rake
Industry:Mining
