- 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 division of the color scale. generally given as about 2,000 degrees F (1,090 degrees C).
Industry:Mining
A division of the European Lower Cretaceous characteristically developed in certain parts of France and Belgium.
Industry:Mining
A division of time traditionally distinguished on the basis of the rock record as expressed by a time-stratigraphic unit. Geochronologic units in order of decreasing rank are eon, era, period, epoch, and age. Names of periods and units of lower rank are the same as those of the corresponding time-stratigraphic units; the names of some eras and eons are independently formed.
Industry:Mining
A division of time traditionally distinguished on the basis of the rock record as expressed by a time-stratigraphic unit. Geochronologic units in order of decreasing rank are eon, era, period, epoch, and age. Names of periods and units of lower rank are the same as those of the corresponding time-stratigraphic units; the names of some eras and eons are independently formed.
Industry:Mining
A document that conveys title to the ground, and no further assessment work need be done; however, taxes must be paid. The procedure of obtaining a patent is divided into five steps: (1) a mineral surveyor is paid to make a patent survey, to adjust boundaries and correct errors, in which case an amended location should be made; (2) at least $500 worth of improvement must have been made per claim; (3) the presence of valuable mineral must be proven beyond reasonable doubt; (4) the matter is taken up with the local land office, and the proper notices must be published in the papers for a specified time; and (5) the purchase price of the land is paid and the patent is received.
Industry:Mining
A dog or tooth attached to a "caterpillar chain" to provide the driving contact with the conveyor chain.
Industry:Mining
A dolomite rock in which calcite is conspicuous, but the mineral dolomite is more abundant; specif. a dolomite rock containing 10% to 50% calcite and 50% to 90% dolomite, or a dolomite rock whose Ca/Mg ratio ranges from 2.0 to 3.5. Compare: dolomitic limestone.
Industry:Mining
A dome or anticlinal fold in which the overlying rocks have been ruptured by the squeezing-out of plastic core material. Diapirs in sedimentary strata usually contain cores of salt or shale; igneous intrusions may also show diapiric structure.
Industry:Mining
A dome-shaped mountain of solidified lava in the form of many individual flows, formed by the extrusion of highly fluid lava, e.g., Mauna Loa, HI.
Industry:Mining
A door constructed to restrict the flow of ventilation air while permitting the passage of personnel and equipment.
Industry:Mining
