- 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 succession of nuclides, each of which transforms by radioactive disintegration into the next until a stable nuclide results. The first member is called the parent, the intermediate members are called daughters, and the final stable member is called the end-product. Four radioactive series are the uranium series, the thorium series, the actinium series, and the neptunium series.
Industry:Mining
A suction chamber is designed to provide a trough of low pressure between the sealed area and the intake, so that air that would otherwise be drawn into the sealed area, through fissures and pores surrounding the seal, is drawn instead into the chamber. If the pressure within the sealed-off mine area is less than that outside, it is necessary to reduce the pressure within the chamber. This can be done by using an ejector or fan to draw air through a pipe in the outer wall of the chamber; a second pipe, fitted with a control valve, serves as an intake. Adjustment of the valve gives regulation of the chamber pressure within fine limits.
Industry:Mining
A sudden acceleration in rotational speed of the rods followed immediately by a sudden return to the former speed.
Industry:Mining
A sudden and often overwhelming flow of water into mine workings. Inrushes of water may be caused by striking unsuspected waterlogged old workings that possibly were shown inaccurately on the mine plans. Faults have also been responsible for serious inflows of water. A fault may retain large volumes of water above or at the same level as workings approaching it. It is usual to drive exploring headings in the direction of the suspected water danger.
Industry:Mining
A sudden and often violent breaking of a mass of rock from the walls of a tunnel, mine, or deep quarry, caused by failure of highly stressed rock and the rapid or instantaneous release of accumulated strain energy. It may result in closure of a mine opening, or projection of broken rock into it, accompanied by ground tremors, rockfalls, and air concussions.
Industry:Mining
A sudden and violent failure of rock masses under stresses exceeding the elastic strength of the rock. The classification and nomenclature of these occurrences are not clear and are based largely on effects and not on the basic causation factor.
Industry:Mining
A sudden glistening of molten gold or silver at the close of cupellation.
Industry:Mining
