- 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 single-tube, drive-type, soil-sampling barrel esp. adapted to sampling deposits of plastic clay where a minimum 5-in (12.7-cm) diameter sample is required. A loop or snare of piano wire is inserted in a groove inside the cutting shoe with the free end of the wire extending through a slot on the side of the sampler to the surface. When pulled, the wire cuts the sample off at the bottom of the cutting shoe.
Industry:Mining
A sink-float process employing a galena medium and utilizing froth flotation as the means of medium recovery.
Industry:Mining
A sink-float process in which the medium is a suspension of clay from the raw coal and minus 200- or 300-mesh barite in water, with the volume of the clay usually equal to about twice that of the barite. Barite clay and coal suspensions can be regulated to get effective washing gravities from 1.2 to 1.8. Sizes from run-of-mine to one-eighth inch may be cleaned by this process, which has been widely adopted in Europe. Also known as the Sophia-Jacoba process in German publications.
Industry:Mining
A sink-float process used principally for coal cleaning. The process uses a water suspension of loess (a natural claylike material) in special trough-type separators provided with a clean coal weir and a reject drag conveyor.
Industry:Mining
A sinking platform consisting of several decks to enable various shaft-sinking operations to be performed simultaneously. The bottom deck, in a three-deck platform, is usually suspended from four winch ropes which also act as guides for the kibbles, and the middle and top decks are supported above the bottom deck by rigid supports. The top deck is used for the manipulation of the concrete buckets and for fixing the shuttering. The center deck is used by the workers when placing the concrete, while the bottom deck 2080 carries telephone, blasting, lighting, and signaling cable drums. The lower side of the bottom deck may carry the equipment for manipulating the cactus grab.
Industry:Mining
A sintered oxide consisting mainly of the oxide BaFe<sub>12</sub>O<sub>19</sub>; used for the production of permanent magnets.
Industry:Mining
A sintered product consisting mainly of magnesia in the form of dense, weather-stable refractory granules.
Industry:Mining
A sintered, powder-metal matrix bit with fragmented bort or whole diamonds of selected screen sizes uniformly distributed throughout the entire crown section. As the matrix 1587 wears down, new, sharp diamond points are exposed; hence, the bit is used until the crown is consumed entirely. Compare: multilayer bit
Industry:Mining
A sinusoidal quantity having a frequency that is an integral multiple of the frequency of a periodic quantity to which it is related.
Industry:Mining
A situation encountered in coal seams, usually near the outcrop, where the coal has undergone combustion and burned. Initiation sources could include lightning, forest fires, etc.
Industry:Mining
