- 업종: 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 ...
A dimorph of gibbsite, long known as a synthetic product, now found as a naturally occuring mineral, Al(OH)<sub>3</sub>, from Portole, Istria. The naturally occurring bayerite from Fenyoro, Hungary, was found by X-ray study to be gibbsite.
Industry:Mining
A dipmeter measures both the amount and direction of dip by readings taken in the borehole and can be operated by using either self-potential or resistivity measurements.
Industry:Mining
A direct process for manufacturing steel, by means of which iron with a carbon content from 0.2% upwards can be produced by smelting, in a specially constructed electrical furnace, a mixture of hematite and coal, or charcoal, the process being continuous. The reduced metal accumulates at the bottom of the furnace, from which it is tapped. Both sulfur and phosphorus are reduced to a low figure without additional refining, while the manganese and silicon contents are controlled in the same way as in the ordinary openhearth process.
Industry:Mining
A direct-fired Belgian furnace used in the United States, conforming essentially to the Liege design.
Industry:Mining
A direction in a crystal parallel to the highest symmetry axis; i.e., the c axis in trigonal, tetragonal, and hexagonal systems; the three reference axes in the orthorhombic system; and the b (or c in the first setting) axis in the monoclinic system.
Industry:Mining
A direction of coal face roughly halfway between the main (bord) and secondary (end) cleavages; on the cross.
Industry:Mining
A direction of less than 45 degrees to the main natural line of cleat or cleavage in the coal. Also spelled horn. Compare: short awn.
Industry:Mining
