- 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 ...
The recovery of the original properties in a crystal that has been distorted by stress resulting from continued relief from stress, heating, or decrease in the speed of deformation.
Industry:Mining
The red gem variety of corundum, the color due to the presence of chromium in the structure. Compare: sapphire
Industry:Mining
The reduction in the value of a mineral deposit as the minerals reserves.
Industry:Mining
The reduction of a substance to carbon by subjecting it to intense heat in a closed vessel.
Industry:Mining
The reduction of metallic oxides, sulfides, or halides by heating in contact with carbon or other reducing agents.
Industry:Mining
The reduction of ores by any process whereby the valuable constituent is recovered.
Industry:Mining
The reduction of prepared ores of iron to metallic iron, as in the blast furnace. The reduction and purification of semirefined iron, such as pig iron, or a mixture of pig iron, scrap iron, and scrap steel, to form substantially pure iron or steel, as in the electric furnace, open- hearth furnace, puddling furnace, or Bessemer converter.
Industry:Mining
The refining of lead by conducting steam through it, while molten, to oxidize certain metallic impurities.
Industry:Mining
The reflection by a substance, such as an opaque gem, of light rays of only certain wavelengths, the others being absorbed. This cause of color in gems is a sort of selective absorption.
Industry:Mining
