- 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 ...
Diamond drilling where the length of borehole generally does not exceed 100 ft (30 m).
Industry:Mining
Diamond inset plates and other geometric forms fastened to and/or supported by the bit blank by brazing or mechanical locking so that in drilling they may be replaced when diamond wear exceeds a specified amount.
Industry:Mining
Diamond material with radial or confused crystal structure lacking distinct cleavage forms. Color is faintly milky to grayish or dark and is suitable only for crushing into grit powder or dust. The Bakwanga Mine, Republic of the Congo, is the principal source of this material. Diamond fragments from cutting establishments or recovered from waste are frequently classed as crushing bort.
Industry:Mining
Diamonds inset in the crown of a bit in concentric circles so that the diamonds in any one circle follow the same groove cut into the rock.
Industry:Mining
Diamonds set in a bit face having points or edges that will be in contact with, and will cut or abrade, the rock when drilling. Compare: cutting edge; gage stone.
Industry:Mining
Diamonds set in bit face in concentric circles so that a slight uncut ridge of rock is left between stones set in adjacent circles. Compare: eccentric pattern
Industry:Mining
Diamonds which in weight will correspond to fourths of a carat; a diamond weighing one-half carat is a two-grainer; one weighing three quarters is a three-grainer; a diamond of one carat in weight is a four-grainer.
Industry:Mining
