- 産業: Mining
- Number of terms: 33118
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- 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 brownish-red to garnet-red, transparent to translucent, hydrous manganese arsenate, Mn<sub>3</sub>(AsO<sub>4</sub>)(OH)<sub>3</sub>.H<sub>2</sub>O ; soon turns black; Mohs hardness, 3; sp gr, 3.50 to 3.65; rare; from Nordmark, Sweden.
Industry:Mining
A brownish-red tungstate of manganese, Mn<sub>+2</sub>WO<sub>4</sub>, one of the end-members of a variable series, commonly known as wolfram or wolframite, (Fe, Mn)WO<sub>4</sub>; monoclinic.
Industry:Mining
A brownish-red tungstate of manganese, Mn<sub>+2</sub>WO<sub>4</sub>, one of the end-members of a variable series, commonly known as wolfram or wolframite, (Fe, Mn)WO<sub>4</sub>; monoclinic.
Industry:Mining
A brownish-yellow resin with low oxygen content and a characteristic pleasant odor found in brown coal.
Industry:Mining
A bucket designed to scoop material from the boot of an elevator and discharge by reason of the combined effect of centrifugal force and gravity.
Industry:Mining
A bucket or car operating up and down a defined path, receiving, elevating, and discharging bulk materials.
Industry:Mining
A bucket widely used in sampling sea-floor rock deposits in all depths up to and exceeding 30,000 ft (9.1 km).
Industry:Mining
A buhrstone; e.g., a coarse-grained sandstone or a fine-grained quartz conglomerate. Also, one of two thick disks of such material used for grinding grain and other materials fed through a center hole in the upper stone. Quarried underground in Virginia; also, produced in New York and (of granite) in North Carolina.
Industry:Mining
