- 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 method of sampling sometimes used at points where coal or mineral is loaded or unloaded by shoveling. Every tenth (or other number) shovelful is deposited separately as sampling material.
Industry:Mining
A method of searching for water or minerals by holding a hazel fork (or other device) in the hands, and the free end is said to bend downward when a discovery is made. In the Middle Ages, the divining rod was closely associated with the mine surveying profession. The water diviner has not succeeded when submitted to impartial scientific tests.
Industry:Mining
A method of seismic surveying by which the effect of irregular weathering thickness may be determined by a simple calculation from reciprocal placement of shotholes and seismometers. The method was originally used to solve refraction problems arising from irregularities in the top of the high-velocity layer.
Industry:Mining
A method of separating compounds in solution or suspension by their differing rates of diffusion through a semipermeable membrane, some colloidal particles not moving through at all, some moving slowly, and others diffusing quite readily. Compare: osmosis See also: electrodialysis
Industry:Mining
A method of separating impurities from coal in a metallic cone containing a mixture of sand and water with a specific gravity higher than that of coal and lower than the impurities. The coal floats, and the impurities sink.
Industry:Mining
A method of shaft sinking by freezing wet ground in sections as the sinking proceeds. The permanent lining is also inserted as the shaft is sunk. The freezing equipment is a cylinder equal in diameter to the shaft and 44 in. (1.12 m) in height, with the lower end closed by a plate. The cylinder is in sections, each of which can be removed. Each section is provided with freezing coils. After freezing the ground, two sections are removed, the ground is thawed locally and removed, and a segment of the permanent lining is inserted. The process is repeated.
Industry:Mining
A method of shaft sinking by the freezing method. It is based on the direct cooling effect of expanding highly compressed carbon dioxide in the freezing pipes.
Industry:Mining
