- 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 ...
The practical mks unit of electric resistance that equals the resistance of a circuit in which a potential difference of 1 V produces a current of 1 A; the resistance in which 1 W of power is dissipated when 1 A flows through it. The standard in the United States. Symbols, Omega and omega .
Industry:Mining
The practical unit of electric current. The current produced by 1 V acting through a resistance of 1 Omega .
Industry:Mining
The practice of initiating individual explosive decks, boreholes, or rows of boreholes at predetermined time intervals using delay detonators, as compared to instantaneous blasting where all holes are fired essentially simultaneously.
Industry:Mining
The practice of pushing tubs, mine cars, or trams, by hand. Tramming was an earlier practice in longwall stall mining, but is now largely obsolete. On the surface, tramming means moving material in skips or wagons running on light railway track.
Industry:Mining
The precipitation or plating-out of a metal from a solution of its salts through the introduction of another metal or a reagent into the solution.
Industry:Mining
The predesign of the detailed layout, main roadways, and workings of a mine or group of mines. The scheme usually involves the introduction of mechanical equipment for the working and transport of the coal or mineral. The selection of mining methods and machines properly adapted to the local conditions is part of planning.
Industry:Mining
The predominant means of extracting precious metal values from loaded activated carbon in the cyanidation process. Loaded carbon is placed in a pressure column along with a solution containing about 1% NaOH. This solution is circulated through the column at 150 degrees C until the precious metal values have been removed from the carbon absorbant. The loaded strip solution serves as the electrolyte for a subsequent electrowinning step for recovery of the precious metals.
Industry:Mining
The preliminary breaking down of run-of-mine ore and sometimes coal. In metal mines, the tertiary crushing may be performed at a central point underground.
Industry:Mining
