- 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 revolving steel ring with three rolls pressing against its inner face. The rolls are supported on springs, and the rings support the roll, so that there is some freedom of motion. The material to be crushed is held against the ring by centrifugal force.
Industry:Mining
A revolving table on which are tapering spiral copper cleats on a linoleum cover. The tailings are washed over the riffles and off the edge, while the concentrates are delivered at the end of the riffles.
Industry:Mining
A rhombohedral form of hydrous sodium borate, Na<sub>2</sub>B<sub>4</sub>O<sub>7</sub>.5H<sub>2</sub>O , simulating regular octahedrons. From the Lagoong of Tuscany, Italy.
Industry:Mining
A rhyolite in which some grains or crystals are visibly larger than others.
Industry:Mining
A rhyolite, the groundmass of which was once glassy but has become devitrified.
Industry:Mining
A ribbed and napped textile material used for recovering coarse gold or other heavy metal or mineral from a stream of sand passing over it. A corduroy blanket is replaced about every 4 hours for washing to remove the gold.
Industry:Mining
A rich copper alloy added to molten copper in order to secure clean, solid castings free from blowholes, swellings, etc.
Industry:Mining
A ridge built along a contour line of a slope to pond rainwater above it.
Industry:Mining
