- 行业: Mining
- Number of terms: 33118
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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 sturdily built grizzly for handling large pieces of ore. This type transports its material across a series of grooved rollers moved mechanically, or alternatively by the sliding ore. Undersize falls through the grooves.
Industry:Mining
A style of cutting precious stones in which the stone is domed on one or both sides.
Industry:Mining
A style of diamond cutting, usually of Indian or other Oriental origin, in which the table is usually double the size of the culet; such stones are generally recut for European or American requirements.
Industry:Mining
A style of faceting gems in which the finished gem is roughly rectangular in outline but with gently outward curving sides and rounded corners.
Industry:Mining
A subcircular to circular dike with steep dip. Ring dikes may be many kilometers long, and hundreds or thousands of meters thick. Their radius is generally from 1 to 20 km. Although some ring dikes may form a nearly complete circle, more commonly they encompass 1/4 to 3/4 of a circle or ellipse. They are commonly associated with alkalic igneous complexes and carbonatites, so are probably related to deep shock effects or to cauldron subsidence. Ring dikes are commonly associated with cone sheets to form a ring complex.
Industry:Mining
A subcircular to circular dike with steep dip. Ring dikes may be many kilometers long, and hundreds or thousands of meters thick. Their radius is generally from 1 to 20 km. Although some ring dikes may form a nearly complete circle, more commonly they encompass 1/4 to 3/4 of a circle or ellipse. They are commonly associated with alkalic igneous complexes and carbonatites, so are probably related to deep shock effects or to cauldron subsidence. Ring dikes are commonly associated with cone sheets to form a ring complex.
Industry:Mining
A subdivision of the Coal Measures--based mainly on plant fossils. It represents in part, the millstone grit of South Wales; well developed in South Scotland, where coal seams are present.
Industry:Mining
A subdivision of the rock association or kindred. A tribe is made up of clans.
Industry:Mining
A sublevel shaft, connected to the main (daylight to depth) shaft by a transfer station. A winze.
Industry:Mining
