- Industry: 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 variation of the freezing method of shaft sinking, in which liquid carbon dioxide is pumped into the ground instead of brine.
Industry:Mining
A variation of the ordinary cut that may be said to represent a combination of the latter and the fan cut. The first drill holes are formed with a sharper angle toward the working face, which facilitates breaking. This type of cut has been employed successfully in headings of small section, the cut hole being blasted first, followed by the bench holes. In order to obtain the maximum possible advance the cut may also be deepened after blasting, during the first pause in working, e.g, the whole section then being broken out simultaneously.
Industry:Mining
A variation of water infusion that has been effective in reducing both explosives consumption and airborne dust concentrations during mining. Water is introduced under pressure into long holes containing explosive charges and forced into the coal seam by detonation of the charges.
Industry:Mining
A variety of adularia in a silver mine at Valencia, Guanajuato, Mexico.
Industry:Mining
A variety of aliphite hydrocarbon containing oxygen; light-yellow; soft.
Industry:Mining
A variety of alkali feldspar consisting of parallel or subparallel intergrowths in which the potassium-rich phase (commonly microcline) appears to be the host from which the sodium-rich phase (commonly albite) exsolved; such exsolved areas may be visible to the naked eye, typically forming strings, lamellae, blebs, films, or irregular veinlets; where texture is invisible to the eye but can be resolved with a microscope, it is microperthite. Compare: antiperthite; cryptoperthite; microperthite.
Industry:Mining
A variety of amber rich in carbon, low in succinic acid, and lacking sulfur, at Delatyn in the Carpathian Mountains.
Industry:Mining
A variety of amphibole or hornblende, resembling cork; the lightest of all minerals.
Industry:Mining
