- 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 ...
The name given to the shale from a drift opened in the side of the ravine at a level 62 ft (18.9 m) below that of the Pittsburgh coal seam.
Industry:Mining
The name of an iron range in Minnesota. It is composed of the syllables, "Cuy" and "Una," the former being a contraction of the given name of Cuyler Adams, who was active in the early development of that territory, and the last syllable being the name of his dog "Una."
Industry:Mining
The name sometimes applied to a fringe or halo differing from the groundmass that often accompanies a porphyroblast in a schistose rock.
Industry:Mining
The narrowest part of an isogyre in an interference figure representing the point of emergence of an optic axis. Compare: interference figure
Industry:Mining
The native element, Os; occurs in magmatic deposits in mafic and ultramafic rocks and placers derived from them.
Industry:Mining
The natural frequency of vibration of a foundation at an average ground pressure of unity is the reduced natural frequency divided by the square root of the ground pressure. This relationship has been established by Tschebotarioff.
Industry:Mining
The natural magnetic field within and surrounding the Earth and the factors affecting it.
Industry:Mining
The natural process by which a fractured, pulverulent, or plastic material acquires a certain amount of ability to support itself partially through the resolution of the vertical component of its weight into diagonal thrust.
Industry:Mining
