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United States Bureau of Mines
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 ...
An optically positive crystal.
Industry:Mining
An orange to yellow-brown gem variety of grossular.
Industry:Mining
An orange to yellow-brown gem variety of grossular.
Industry:Mining
An orange-yellow opal colored with orpiment.
Industry:Mining
An ordinary rock drill held in the hand and not mounted on a bar or column. The air leg support is now widely used in tunnels and rock drilling generally.
Industry:Mining
An ore bin made by cutting away the floor of the station close to the shaft.
Industry:Mining
An ore containing an appreciable amount of valuable metal, but smelted mainly because it contains fluxing agents that are required in the reduction of richer ores.
Industry:Mining
An ore deposit formed at an estimated depth of 12,000 ft (3.66 km) or more, at temperatures ranging from 300 to 575 degrees C; e.g., the tin deposits of Cornwall, England. The deposits are commonly tubular or veinlike in form, though some are irregular in shape.
Industry:Mining
An ore deposit formed by magmatic segregation, generally in mafic rocks and layered intrusions, as crystals of metallic oxides or from an immiscible sulfide liquid.
Industry:Mining
An ore deposit formed by magmatic segregation, generally in mafic rocks and layered intrusions, as crystals of metallic oxides or from an immiscible sulfide liquid.
Industry:Mining
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