- 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 ...
A compact, dense, homogeneous, exceedingly fine-grained limestone having a pale creamy yellow or grayish color and a conchoidal or subconchoidal fracture. It was formerly much used in lithography for engraving and the reproduction of colored plates.
Industry:Mining
A compact, fine-grained, generally impure mica near muscovite in composition; dullgray, green, or brown; derived from the alteration of other minerals, esp. cordierite, nepheline, scapolite, spodumene, and feldspar.
Industry:Mining
A compact, homogeneous, hard-to-soft chert, common in insoluble residues, composed of distinguishable and relatively uniform-sized grains, characterized by an uneven or rough fracture surface and by a dull to glimmering luster; it may appear saccharoidal.
Industry:Mining
A company which transforms refined metal (and sometimes scrap as well) into semifabricated products, (e.g., wire, cable, tubes, strip, rods) for sale to an endconsumer.
Industry:Mining
A company which transforms refined metal (and sometimes scrap as well) into semifabricated products, (e.g., wire, cable, tubes, strip, rods) for sale to an endconsumer.
Industry:Mining
A compartment for the driver in a mine locomotive, continuous mining machine, shuttler car, scoop, etc. All coal mine locomotives in excess of 10 st (9 t) weight must have a cab at each end or an adequate center cab.
Industry:Mining
A compartment or passageway carried beneath the floor of a heading or of an excavation in a coal mine for ventilation.
Industry:Mining
A compass in which a magnetic needle is suspended on a jewel and a stirrup so that it can rotate about both a horizontal and a vertical axis.
Industry:Mining
A compass of delicate construction for observing the variation of the magnetic needle.
Industry:Mining
