- 行业: Mining
- Number of terms: 33118
- Number of blossaries: 0
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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 term used esp. in miscroscopic work to describe those minerals whose cross sections show their successive concentric layers of growth.
Industry:Mining
A term used esp. in the Western United States for a narrow, deep ravine with steep sides, larger than a gully; esp. a short, precipitous cleft in a hillside, formed and occupied by a torrent, and containing gold (as in California).
Industry:Mining
A term used for a line that connects all areas of equal uplift or depression; it is used esp. in Quaternary geology as a means for expressing crustal movements related to postglacial uplift.
Industry:Mining
A term used for agatized wood, esp. agate formed by siliceous permineralization of wood.
Industry:Mining
A term used for any ore of importance for its manganese content containing less than 35% manganese but not less than 5%.
Industry:Mining
A term used for common clay, in reference to the material of which Adam, the first man, was made; specif. a kind of red clay.
Industry:Mining
A term used for ore containing 35% or more manganese; it may include concentrate, nodules, or synthetic ore.
Industry:Mining
A term used for short-flame explosives before the introduction of permissible explosives.
Industry:Mining
