- 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 ...
A drilled borehole in which explosive materials are loaded without priming the hole or including an initiator.
Industry:Mining
A driller's term for material eroded from outcrops of granitic rocks and redeposited to form a rock having approx. the same major mineral constituents as the original rock; e.g., an arkose consisting of granitic detritus.
Industry:Mining
A drill-hole deflecting wedge having a short metal sleeve attached to the uppermost end. The outside diameter of the sleeve is the same as that of the lower, full-circle part of the wedge.
Industry:Mining
A drill-hole pattern consisting of a shallow wedge within an outer wedge, which is often used to obtain deep pull in hard rock.
Industry:Mining
A drilling bit in which the diamonds are set into holes drilled into a malleable-steel bit blank and shaped to fit the diamonds. The hand method has been almost completely superseded by mechanical setting methods. Compare: mechanical set.
Industry:Mining
A drilling bit that is threaded or tapered and is removable from the drill steel; not formed as an integral part of the drill steel. The all-steel bit can be resharpened, but the tungsten carbide insert type may be nonresharpenable. Also known as rip bit or knockoff bit.
Industry:Mining
