- 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 ...
The outer or upper zone of the Earth's core, extending from a depth of 2,900 km to 5,100 km, and including the transition zone; it is equivalent to the E layer and the F layer. It is inferred to be liquid because it does not transmit shear waves. Its density ranges from 9 to 11 g/cm<sub>3</sub>. The outer core is the source of the principal geomagnetic field. Compare: inner core
Industry:Mining
The outer part of the Earth above the level of isostatic equilibrium, in which the dynamic processes are thought to occur that cause orogenesis near and at the surface. Compare: crust
Industry:Mining
The outer part of the Earth's atmosphere, beginning at an altitude of about 25 miles (40 km) and extending to the highest parts of the atmosphere: it contains several regions that consist of a series of constantly changing layers characterized by an appreciable electron and ion content.
Industry:Mining
The output of ore or coal that can be expected to be raised regularly and in normal circumstances, per day or week.
Industry:Mining
The output or work done by a worker in one shift; a basis for assessing the magnitude of a job to complete.
Industry:Mining
The outside diameter of the hub, or the diameter at the base of a groove cut in the hub to provide clearance for the link plates.
Industry:Mining
The overhead suspension of contact wire for electric traction by vertical links of different lengths connected to a catenary wire above it. The contact wire will thus be maintained at a constant height.
Industry:Mining
The overriding or overthrusting of oceanic crust onto the leading edges of continental lithospheric plates; plate accretion.
Industry:Mining
The ownership of the minerals under a given surface, with the right to enter thereon, mine, and remove them. It may be separated from the surface ownership, but, if not so separated by distinct conveyance, the latter includes it.
Industry:Mining
