- 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 combination of the panel and room-and-pillar method of mining.
Industry:Mining
A combination trough washer and jig in which the feed enters the unit through the central launder, where stratification takes place. The stratified material overflowing the stationary trough is divided at the first opening in the shaking jig, allowing the upper stratum of the material to flow onto the top deck of the jig while the lower stratum enters the jig reclean chamber. (Mitchell, 1950)
Industry:Mining
A combining form taken from the Greek meaning lung, and used in connection with the terminology of geologic processes and effects involving gases and vapors.
Industry:Mining
A combustible gases detector developed in 1902. A form of Wheatstone bridge is used and changes in electrical resistance due to temperature differences are measured. The combustible gases/air sample flows over one set of wires and the gas burns catalytically while the other wires do not come into contact with the sample.
Industry:Mining
A combustible gases roof layer flowing under the action of buoyancy without ventilation.
Industry:Mining
A combustible-gas detector based on the velocity of light. A beam of light is split into two parts that pass respectively through chambers containing pure air and the test air at velocities characteristic of the gases. When methane is present, the light beams are out of step and this movement becomes a measure of the methane concentration.
Industry:Mining
A combustible-gas drainage method utilizing controlled drainage from the coal seams as they are being mined. This method, which is also known as the pack cavity method, was devised to extract gas from the mined-out areas of advancing longwall mining systems by leaving corridors or cavities at regular intervals in the pack.
Industry:Mining
A combustible-gases detector depending upon the combustion or oxidation of methane at heated filaments. Usually the gas is drawn through the apparatus by a rubber suction bulb, and the filaments are heated by a battery in the instrument. A version of this principle is the resistance methanometer.
Industry:Mining
A command to start operating a drill either to collar a borehole or to restart work on the first working shift of a day.
Industry:Mining
