- 行业: Mining
- Number of terms: 33118
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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 ...
The series of nuclides resulting from the decay of uranium-238. The mass numbers of all members of the series are given by 4n+2, where n is an integer; therefore, the sequence is also known as the 4n+2 series. It is also known as the uranium-radium series.
Industry:Mining
The series of radioactive elements produced as successive intermediate products when the element thorium (thorium 232) undergoes its spontaneous natural radioactive disintegration into stable lead (lead 208).
Industry:Mining
The set obtained by the addition of water to hydraulic setting materials.
Industry:Mining
The set of metamorphic mineral assemblages (facies) in which basic rocks are represented by hornblende + albite + epidote. Equivalent to Eskola's epidote-amphibolite facies, it is of uncertain status, transitional between the greenschist facies and the amphibolite facies. It is generally believed to be favored by the higher pressures of regional metamorphism.
Industry:Mining
The set of metamorphic mineral assemblages (facies) in which basic rocks are represented by hornblende + plagioclase, the plagioclase being oligoclase-andesine or some more calcic variety. Epidote and almandine are common in amphibolites. The facies is typical of regional dynamothermal metamorphism under moderate to high pressures (in excess of 300 MPa) with temperatures in the range 450 to 700 degrees C.
Industry:Mining
The setting of diamonds in a bit crown without regard to a geometric pattern--without regular and even spacing.
Industry:Mining
The setting of timber or steel supports regularly at fixed intervals irrespective of the condition of the roof and sides; a support in accordance with a system specified in rules made by the manager of the mine.
Industry:Mining
The setting of timber sets and lagging very close together when shaft sinking or tunneling through very loose ground or crushed coal in thick seams.
Industry:Mining
The settlement of a solid from a liquid, and removal of the clear liquid.
Industry:Mining
