- 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 term applied to semiprecious stones prized for qualities other than intrinsic value.
Industry:Mining
A term applied to small irregular cavities in igneous rocks, esp. granites, into which small crystals of the rock-forming minerals protrude; characteristic of, pertaining to, or occurring in such cavities. Also, said of a rock containing such cavities. Compare: drusy
Industry:Mining
A term applied to some varieties of tool steels that will retain their hardness even when operating at a red heat.
Industry:Mining
A term applied to the gases and vapors, and fine dust entrained by them, that issue from the throats of furnaces; consists of three distinct substances: gases (including air), flue dust, and the fume.
Industry:Mining
A term applied to the rims or borders consisting of microcrystalline aggregates of pyroxene or amphibole occurring around olivine, where it would otherwise be in contact with plagioclase, or around garnet, where it would otherwise be in contact with olivine or other magnesium-rich minerals.
Industry:Mining
A term applied to the unintentional detonation of all or a part of a large quantity of explosive material (bulk truckload, shipload, or caseload) by the explosion of a smaller quantity of explosives or a flame.
Industry:Mining
A term applied to those basaltic lavas that occur as vast composite accumulations of horizontal or subhorizontal flows, which, erupted in rapid succession over great areas, have at times flooded sectors of the Earth's surface on a regional scale. They are generally believed to be the product of fissure eruptions. Compare: shield basalt
Industry:Mining
A term applied when a drill or other machine is attached permanently to a skid.
Industry:Mining
A term applied when drilling rock or a formation so soft that the drill bit tends to penetrate too rapidly and the circulation fluid is unable to clear the cuttings away fast enough to prevent their adhering to and compacting on the surfaces of the bit and other downhole drilling equipment and/or the borehole sidewalls. Compare: balling formation; gummy.
Industry:Mining
A term applying to mine track ties. A large split is a split exceeding 5 in (13 cm) in length. Splits not longer than 5 in are permissible providing satisfactory antisplitting devices have been properly applied.
Industry:Mining
