- 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 ...
An extrusive or hypabyssal igneous rock consisting mainly of analcime and pyroxene (usually titanaugite). Feldspathoids, plagioclase, and/or olivine may be present. Apatite, sphene, and opaque oxides may be present as accessories.
Industry:Mining
An extrusive rock intermediate in composition between trachyte and basalt, characterized by the presence of both calcic plagioclase and alkali feldspar, along with clinopyroxene, olivine, and possibly minor analcime or leucite. Approx. synonymous with hawaiite.
Industry:Mining
An extrusive rock similar in composition to a leucitophyre but containing haueyne in place of some of the leucite. Other possible phases include nepheline, augite, magnetite, apatite, melilite, and mica. A partial syn. of haueynitite; some rocks are called haueynophyre when haueyne is a conspicuous mineral but not necessarily a major constituent.
Industry:Mining
An extrusive rock, intermediate in composition between trachyte and andesite, with sodic plagioclase, alkali feldspar, and one or more mafic minerals (biotite, amphibole, or pyroxene).
Industry:Mining
An eye at the end of a rod through which tow is passed for cleaning boreholes.
Industry:Mining
An eye disease suffered by some miners, in which there is a spasmodic oscillatory movement of the eyeballs; in severe cases, the victim finds difficulty in walking straight. Bad lighting is generally believed to be the main cause, and is possibly aggravated by the workers lying on their sides in thin seams.
Industry:Mining
An FM apparatus, using the mine haulageway trolley wire for power and antenna, that permits the dispatcher to talk back and forth with his motor crews as they are moving throughout the mine. This saves stopping and starting trips to make telephone calls.
Industry:Mining
An H-section girder used as a roadway or face beam support. The girder for spanning roadways is commonly 6 in (15.2 cm) deep and 5 in (12.7 cm) in width of flange. It is supported by wood or steel props or by brick or concrete sidewalls, the roof being made secure by timber or sheet lagging. Channel section girders are also used in special cases.
Industry:Mining
An hydraulic cutter dredge that uses a bucket wheel excavator in place of the traditional rotary cutter. The bucket wheel is characterized by its high cutting torque in both directions and by a positive feed of the excavated material into the mouth of the dredge pipe.
Industry:Mining
