- Branża: Mining
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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 decorative brown jasperlike, fine-grained quartz, from Sioux Falls, SD. Used for tables and interior architectural trim.
Industry:Mining
A deduction from the inital weight of washed coal to allow for the expected loss of water by drainage.
Industry:Mining
A deep blue pseudoisometric hydrous oxychloride of lead, copper, and silver from Boleo, Lower California. A tetragonal form of percylite.
Industry:Mining
A deep green, relatively soft metamorphic rock of green fuschite (chromian muscovite) and clay with scattered grains of rutile; occurs in Transvaal and Zimbabwe; is carved for ornamental use.
Industry:Mining
A deep hole, covered and usually lined or filled with rocks, that holds drainage water until it soaks into the ground.
Industry:Mining
A deep manhole in which the access shaft is built to one side of the inspection chamber.
Industry:Mining
A deep well pump valve in which a ball fits into a seat and prevents the backflow of oil or water. Each standing valve and each traveling valve has a ball and seat.
Industry:Mining
A deep-green chromiferous syenite cut as a gemstone and resembling jade in appearance. Obsolete.
Industry:Mining