- 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 ...
An assemblage of veins of a particular area, age, or fracture system, usually inclusive of more than one lode.
Industry:Mining
An assembled gem substitute composed of two pieces of material fused or cemented together. If both parts are of the species being imitated, it is a genuine doublet; if one part, it is a semigenuine doublet; if it contains no parts of the species being imitated, it is a false doublet; or if no part is a mineral, it is an imitation doublet. Compare: triplet
Industry:Mining
An assembled stone commonly consisting of a crown and pavilion of rock crystal bound together by transparent green cement or a thin piece of green sintered glass; immersed in water and viewed sideways, the top and bottom are colorless with a line of color along the girdle. Green or colorless beryl may be used for the crown and possibly for the 1081 pavilion. Glass may be used for the pavilion, and sometimes for the crown as well, but the trade still calls it an emerald triplet.
Industry:Mining
An assembled stone commonly consisting of a crown and pavilion of rock crystal bound together by transparent green cement or a thin piece of green sintered glass; immersed in water and viewed sideways, the top and bottom are colorless with a line of color along the girdle. Green or colorless beryl may be used for the crown and possibly for the 1081 pavilion. Glass may be used for the pavilion, and sometimes for the crown as well, but the trade still calls it an emerald triplet.
Industry:Mining
An assembled stone of two main parts of gem materials bonded by a layer of cement or other thin substance (the third part of the triplet), which gives color to the assemblage. Compare: doublet; emerald triplet.
Industry:Mining
An assembly of 4 to 8 metal trays, usually 30 in (76.2 cm) wide and 8 to 15 in (20.3 to 38.1 cm) long, arranged in series in the direction of flow. The trays are detachably mounted in the assembly by steps, so that the overflow from one tray overlaps the next tray by 1 in (2.54 cm) and is 2 to 4 in (5.1 to 10.2 cm) above it. The trays are inclined downward in the direction of the flow at an angle adjustable from 14 degrees to 18 degrees. The entire assembly is mechanically oscillated transversely to the direction of the flow at about 200 strokes/min with an adjustable stroke of about 1/2 in (1.27 cm). The storage bin and feed roller are independently mounted and discharge a layer 1 grain thick.
Industry:Mining
An assembly of hydraulically operated steel hydraulic supports, on a longwall face, that are moved forward as an integral unit by means of a hydraulic ram coupled to the heavy steel face conveyor.
Industry:Mining
An assembly of hydraulically operated steel hydraulic supports, on a longwall face, that are moved forward as an integral unit by means of a hydraulic ram coupled to the heavy steel face conveyor.
Industry:Mining
An assembly of hydraulically operated steel hydraulic supports, on a longwall face, that are moved forward as an integral unit by means of a hydraulic ram coupled to the heavy steel face conveyor.
Industry:Mining
An assembly of two restrained-type sockets for coupling together two trailing cables fitted with restrained plugs.
Industry:Mining
