- 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 common type of gage used with the pitot tube. A straight glass tube with connections at each end is mounted in an inclined position on an aluminum frame, and a scale is placed under the tube. In place of water, a colored oil is used, and the scale is graduated to read directly in inches of water.
Industry:Mining
A common type of metamorphism involving the effects of directed pressures and shearing stress as well as a wide range of confining pressures and temperatures. It is related both geographically and genetically to large orogenic belts, and hence is regional in character. Compare: regional metamorphism; dynamic metamorphism.
Industry:Mining
A commonly dull or earthy, soft to hard, sometimes finely porous chert of essentially uniform composition, having an uneven or rough fracture surface, and resembling chalk.
Industry:Mining
A commonly dull or earthy, soft to hard, sometimes finely porous chert of essentially uniform composition, having an uneven or rough fracture surface, and resembling chalk.
Industry:Mining
A commonly dull or earthy, soft to hard, sometimes finely porous chert of essentially uniform composition, having an uneven or rough fracture surface, and resembling chalk.
Industry:Mining
A compact argillaceous rock containing the clay mineral kaolinite in a variety of forms together with occasional detrital and carbonaceous material; commonly occurring as a thin band in a Carboniferous coal seam (or locally in the roof of a seam); often used as an aid in correlating European strata of Westphalian age.
Industry:Mining
A compact banded deposit of calcite or aragonite found in caves, capable of taking a high polish and resembling true onyx in appearance.
Industry:Mining
A compact banded deposit of calcite or aragonite found in caves, capable of taking a high polish and resembling true onyx in appearance.
Industry:Mining
A compact columnar variety of hematite with a brownish-red to iron-black color; so called to contrast it with limonite and turgite.
Industry:Mining
A compact fibrous variety of talc pseudomorphous after pyroxene; harder than talc; polishes well; made into ornamental objects; in northern New York and Canada.
Industry:Mining
