- 行业: Mining
- Number of terms: 33118
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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 vapor density of a gas, or its density relative to hydrogen, is the number of times a volume of the gas is heavier than the same volume of hydrogen, the volume of both gases being at the same temperature and pressure.
Industry:Mining
The variation in dimensions of any ceramic product from the intended dimensions.
Industry:Mining
The variety of platy flow structure that forms during crystallization of a magma and is due to the parallelism of platy minerals.
Industry:Mining
The various physical and mechanical processes in which raw coal is dedusted, graded, and treated by dry methods (rarely) or water methods, using dense-media separation (sink-float), jigs, tables, and flotation. The objective is the removal of free dirt, sulfur, and other undesirable constituents.
Industry:Mining
The vast region of Precambrian rocks having an areal extent of 2 million square miles (5.2 million km<sub>2</sub>) in eastern Canada.
Industry:Mining
The vector resultant of the intensity of the horizontal and vertical components of the Earth's magnetic field at a specified point.
Industry:Mining
The velocity at which a winding engine lifts a cage or skip in a shaft. Winding speeds reach up to 6,000 ft/min (1.8 km/min) for deep mines. The normal maximum speed for deep shafts is 3,500 to 4,000 ft/min (1.1 to 1.2 km/min) and for geared winders, 1,500 to 3,000 ft/min (0.46 to 0.91 km/min).
Industry:Mining
The velocity head at the discharge of the ventilation system. Throughout the system, the velocity head changes with each change in duct area or number and is a function only of the velocity of airflow. It is not a head loss. The velocity head for the system must technically be counted a loss, because the kinetic energy of the air is discharged to the atmosphere and wasted. Therefore, it must be considered a loss to the system in determining overall energy loss.
Industry:Mining
