- 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 ...
Light that has passed through an object, as distinguished from light reflected from a surface. The nonopaque minerals in rocks are commonly studied in transmitted planepolarized light for characterization and identification by use of a polarized-light microscope. Gems are usually examined for imperfections by transmitted light. Compare: birefringence; index of refraction.
Industry:Mining
Light with its electric vector restricted to a plane or to an elliptically or circularly helical path as a result of filtration, reflection, or interaction with a crystal structure.
Industry:Mining
Lightweight pipe, usually about 4 in (10 cm) in diameter. A typical joint of casing is 10 ft (3 m) long and has threaded connections on both ends. The primary use of casing is to prevent the shothole from caving and bridging. The lightweight casing may be considered as an expendable item.
Industry:Mining
Lightweight, siliceous fireclay, acid-resisting brick, burned to a glasslike mass.
Industry:Mining
Like undercurrent relays, undervoltage relays indicate when voltage is not up to the level it should be. Undervoltage values result in the breaker tripping and staying out until the undesirable condition is corrected.
Industry:Mining
Lime added to auriferous pulp to ensure alkalinity. Important in the cyanidation process for precious metals.
Industry:Mining
Lime that is combined with silica, alumina, and iron oxide and will set and harden underwater.
Industry:Mining
Lime-cemented, valley-flat deposit of clay, silt, sand, and gravel, found in Nebraska and Kansas; a type of caliche.
Industry:Mining
Limestone with narrow branching fucoidallike, cylindrical masses of dolomite, often with a central tube or hole; a variegated limestone. It may be organic or inorganic in origin.
Industry:Mining
