- 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 ...
Asphalt that is made artificially from grit, crushed stone, or gravel and is bonded or coated with tar or a tarbitumen mixture.
Industry:Mining
Associated dikes (or other minor intrusions) composed of different, but related rocks, regarded respectively as leucocratic and melanocratic differentiation products from a common magma; e.g., aplite and lamprophyre; bostonite and camptonite.
Industry:Mining
Asteriated yellow variety of corundum, wrongly called Oriental topaz.
Industry:Mining
Asterism seen by reflected light, as in star ruby or sapphire cut en cabochon to reveal asteria. The effect is created when light is reflected from suitably oriented inclusions within the stone.
Industry:Mining
At any point on the surface of a stressed body, strains measured on each of three properly chosen intersecting gage lines make possible the calculation of the principal stresses at that point. Such gage lines, and the corresponding strains, are called a strain rosette.
Industry:Mining
At collieries where there is only one recognized coal-winning shift in 24 h, it is a general practice to have double shifts (and sometimes treble) of workers in development headings that require a speedy advance.
Industry:Mining
