- Industry: 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 ...
Consists of a length of pipe that is lowered from a vessel to obtain samples. Highvelocity water is pumped through the pipe, and the jetting action of this water issuing from the lower end of the pipe very effectively cuts a hole in the unconsolidated overburden sediments. Once at bedrock, the pipe is rammed into the rock with sufficient force to obtain a plug several inches in length.
Industry:Mining
Consists of a single length of belting, half the length of a double unit face, which is shuttled backward and forward along the face by means of low-type winches at each end of the face, interlocked and fitted with limit switches. The coal is plowed off the belt at the loader gate onto the gate conveyor.
Industry:Mining
Consists of one or more idler rolls arranged to form a catenary trough. This may be accomplished by mounting a single roll on a flexible shaft or by linking a series of rolls with individual rigid shafts.
Industry:Mining
Consists of one or more trains of alternating two-high stands. As the piece being rolled emerges from one stand, it is turned through 180 degrees and entered into the next stand and similarly into the succeeding stands. In some mills, the looping is performed by hand, while in others it is done mechanically by means of repeaters or looping channels.
Industry:Mining
Consists of planks placed side by side along a continuous frame. Its use is to prevent local crumbling of less compacted soils. Since crevices can exist between planks, it should not be used with fine silts or liquid soils, which can seep through these cracks. Compare: skeleton sheathing; tight sheathing.
Industry:Mining
Consists of pumping the discharge directly into the sea and using the tide to carry the fines to deeper water areas. Agitation dredging is employed only during ebb tide in tidal estuaries having swift tidal flows that will disperse the accumulations of silt.
Industry:Mining
Consists of pure limestone or sometimes dolomite and is used in iron blast furnaces and foundries. Usually material below 2 in (5.1 cm) in diameter is eliminated. The most desirable size is between 4 in and 6 in (10 cm and 15 cm).
Industry:Mining
Consists of roasting matte carrying copper, lead, gold, and silver at a very low temperature, forming copper sulfate and oxide, but not silver sulfate. This product is leached with dilute sulfuric acid for copper. The resulting solution is treated with calcium chloride, and the copper is precipitated as subchloride by passing SO<sub>2</sub>through the solution. The cuprous chloride is then reduced to cuprous oxide by milk of lime, regenerating calcium chloride, and the cuprous oxide is smelted.
Industry:Mining
Consists of sandstone, quartzite, mica schist, soapstone, or other rock that will withstand a moderately high temperature without fusing, cracking, or disintegrating. It may be used in solid blocks or crushed and mixed with a binder to form bricks.
Industry:Mining
Consists of the use of high-pressure water jets to disintegrate ore-bearing ground, together with gravel pumps to elevate the spoil to a treatment plant. Initial mining operations consist of the establishment of the mine hole or paddock. This is achieved by sinking or cutting downwards with monitors and removing the spoil by pumping, the pump being lowered as the hole deepens.
Industry:Mining
