- 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 ...
System of pulleys incorporated in the return-side tracking of a belt conveyor, which turns it through 180 degrees , so that any adherent abrasives do not come in contact with idler pulleys.
Industry:Mining
System of valves or other mechanical device controlling the rate at which longitudinal movements are imparted to the diamond- or rock-drill stem and/or the cutting teeth on a coal-cutting machine.
Industry:Mining
System used to control grinding rate in a ball mill; a microphone listens to the grinding sound and maintains this by varying the rate of new feed to the mill.
Industry:Mining
Systematic exploration by a mine rescue team of all intersecting and adjacent passageways so that the team is never forward (toward the working face) of an accessible, unexplored area.
Industry:Mining
Systems of rope haulage may be classified as (1) self-acting or gravity planes; (2) engine planes; (3) tail-rope haulage; (4) endless-rope haulage; and (5) aerial tramways, which are frequently considered by themselves, since they are not applied to transporting material underground.
Industry:Mining
Tables used in ore dressing for sorting fine material by means of a film of flowing water. These tables may be considered as surface tables, from which the products are removed before they have found a bed, so that the washing is always done on the same surface; also building tables or buddles, on which the products are removed after they have formed a bed. These use the relative transporting power of a film of water flowing on a quiet surface, which may be either rough or smooth, to act upon the particles of a watersorted product. The smaller grains, of high specific gravity, are moved down the slope slowly or not at all by the slow undercurrent; the larger grains, of lower specific gravity, are moved rapidly down the slope by the quick upper current.
Industry:Mining
Tacheometric survey, in which points sighted from a survey station are oriented as with a theodolite, and their distance is read by means of a vertically held leveling staff on stadia wires.
Industry:Mining
Taken or laid down as a standard for measuring, reckoning, or constructing.
Industry:Mining
Taking a sample from each unit so that increments are taken at regular intervals whenever the coal or coke is handled at the point of sampling.
Industry:Mining
Taking each sample in a number of subsamples by putting increments in turn into different containers, in order to estimate the sampling accuracy. The same total weight of sample is collected whether or not replicate sampling is employed.
Industry:Mining
