- المجال: 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 widely used medium for magnetic recording. It consists of a circular platter of magnetically coated plastic material that rotates on a turntable in the same way as a phonograph record. The magnetic channels, each in contact with a fixed head aligned along a radius from the center, are on concentric circular bands extending inward from the outer edge of the disk.
Industry:Mining
A widespread, deep-sea deposit largely composed of the shells of foraminifera, among which Globigerina is esp. abundant. Other calcareous remains are present (about 10%), together with an inorganic residue (about 3% or 4%) having the composition of red clay.
Industry:Mining
A widespread, nonstratified, porous, friable, usually highly calcareous, blanket deposit (generally less than 30 m thick), consisting predominantly of silt with subordinate grain sizes ranging from clay to fine sand. It covers areas extending from north-central Europe to eastern China as well as the Mississippi Valley and Pacific Northwest of the United States. Loess is generally buff to light yellow or yellowish brown; often contains shells, bones, and teeth of mammals; and is traversed by networks of small narrow vertical tubes (frequently lined with calcium carbonate concretions) left by successive generations of grass roots, which allow the loess to stand in steep or nearly vertical faces. Loess is now generally believed to be windblown dust of Pleistocene age. Compare: adobe
Industry:Mining
A winding drum or hoist on which the wire line is wound when handling the inner tube and overshot assemblies of a wire-line core barrel.
Industry:Mining
A winding drum or hoist on which the wire line is wound when handling the inner tube and overshot assemblies of a wire-line core barrel.
Industry:Mining
A winding drum with a cylindrical middle portion and two conical outer portions; used sometimes where the weight of the winding rope is large compared with the coal or mineral load. The heavily loaded upgoing rope winds on the small diameter, while the downgoing rope winds off the large diameter. The effect is to compensate for the heavy torques due to rope unbalance and acceleration.
Industry:Mining
A winding drum, cone-shaped at each end, for balancing the load upon the engine during winding operations.
Industry:Mining
A winding rope capping consisting of two tapered iron wedges that encircle the rope, the end of which is prevented from unravelling by casting onto it a small block of white metal. The wedges are contained by a steel bow, over which four or five wrought-iron hoops are driven. The greater the pull on the rope, the more the wedges grip it as they are drawn into the encircling hoops.
Industry:Mining
