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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 ...
A pneumatic ventilating apparatus consisting of two vessellike gas holders, which are moved up and down in a tank of water. By this means, air is sucked out of a mine.
Industry:Mining
A pneumatolytically altered granitic rock composed largely of quartz, mica, and topaz. The mica is usually muscovite or lepidolite. Tourmaline, fluorite, rutile, cassiterite, and wolframite are common accessory minerals.
Industry:Mining
A pocket device for the rapid determination of the percentage of a specific gas in the atmosphere of mines, boiler rooms, blast furnaces, etc.
Industry:Mining
A pocket implement combining the uses of many instruments, such as thermometer, level, plummet, and lens.
Industry:Mining
A pocket of very rich ore.
Industry:Mining
A pocket-size instrument that registers the number of steps taken by the person carrying it.
Industry:Mining
A point at the end of a perforated tube used for sinking wells.
Industry:Mining
A point at, or near, the bottom of a borehole.
Industry:Mining
A point contact between a metal and a crystal (such as copper and galena), or between two crystals (such as zincite and bornite). It has marked unidirectional conductivity.
Industry:Mining
A point defect in a crystal structure where an atom or ion is missing from its expected position.
Industry:Mining
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