- 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 geophysical prospecting technique utilizing natural Earth currents as a source instead of artificially generated currents injected into the ground.
Industry:Mining
A geophysical surveying method used in the self-potential system of prospecting, in which one electrode remains stationary while the other is grounded at progressively greater distances from it. The method indicates a mineral body directly beneath the greatest anomaly and has been extensively and successfully used.
Industry:Mining
A geophysical test based on the resistivity method to determine underground geological structure.
Industry:Mining
A German method of lining roadways subjected to heavy pressures. It consists of a closed circular arch of specially shaped precast concrete blocks. The blocks, which are wedge-shaped, are made in two sizes for each lining and erected in such a way that alternate blocks offer their wedge action in opposite directions--the larger blocks toward the center of the roadway and the smaller outward. This arrangement gives a doublewedge effect so that part of the lateral pressure exerted by the strata on the lining is diverted axially along the roadway.
Industry:Mining
A German process that cleans the coal and also reduces the moisture content to about 10%. Heavy oil is added to a coal slurry containing 50% to 60% water. On mixing, the coal particles become coated with oil and hence resistant to water, whereas the shale particles remain uncoated and easily wetted. By high-speed centrifuging the coal-oil mixture is retained in the centrifuge while the shale particles pass out with the water. The process is not as efficient as froth flotation.
Industry:Mining
A germanium-bearing variety of diaphorite from Freiberg, Saxony, Germany.
Industry:Mining
A girasol sapphire with a chatoyant effect. Compare: ruby cat's eye.
Industry:Mining
