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United States Bureau of Mines
Industry: 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 ...
Approximate method of analysis, where particles of value and gangue are similar in shape and size, and their proportions can be assessed by inspection, probably under a low-powered microscope.
Industry:Mining
Aqueous extract of a bark of quebracho tree; contains up to 65% tannin. Used in frothflotation as depressant for oxidized minerals.
Industry:Mining
Arbitrary quantitative units by means of which the scratch hardness of a mineral is determined. The nonlinear units of hardness are expressed in numbers ranging from 1 through 10, each of which is represented by a mineral that can be made to scratch any other mineral having a lower-ranking number; hence the minerals are ranked from the softest, as follows: talc (1) ranging upward in hardness through gypsum (2), calcite (3), fluorite (4), apatite (5), orthoclase (6), quartz (7), topaz (8), corundum (9), to the hardest, diamond. Compare: hardness; Knoop hardness.
Industry:Mining
Archaic name for amber.
Industry:Mining
Arches built of special refractory shapes, supported by water-circulating members.
Industry:Mining
Area closed at lower end by constraining wall or dam to which mill effluents are run. Clear water may be returned after settlement in dam, via penstock(s) and piping.
Industry:Mining
Area in which an earthquake is registered by instruments only.
Industry:Mining
Areas of coal or mineral believed to lie beyond the developed reserves but not yet proven by development.
Industry:Mining
Areas of coal or mineral believed to lie beyond the developed reserves but not yet proven by development.
Industry:Mining
Arg. A monoclinic mineral occurring as oriented intergrowths with parabutlerite. A hydrous sulfate of iron.
Industry:Mining