- 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 rock-drilling tool with chisellike cutting edges, which when driven by impacts against a rock surface, drills a hole by a chipping action.
Industry:Mining
A rock-fracturing technique in which electrical energy is used directly in fracturing the rock, either by heating it in a variable electric or electromagnetic field set up in the rock by a high-frequency electric current, or by the direct puncturing of the rock by an electric current.
Industry:Mining
A rock-statigraphic unit formerly classed as a formation but now called a group because subdivisions of the unit are considered to be formations.
Industry:Mining
A rock-type coal consisting of the maceral vitrinite (collinite or telinite) with smaller amounts of other macerals. Compare: vitroclarain
Industry:Mining
A rock-type coal consisting of the maceral vitrinite (telinite or collinite) and large quantities of other macerals, mainly micrinite and exinite. Micrinite is present in lesser quantities than is true with clarodurain. Compare: clarodurain
Industry:Mining
A rock-type coal consisting of the macerals fusinite and vitrinite and may contain all other macerals. Fusinite is present in a larger quantity than in fusoclarain. Compare: fusoclarain
Industry:Mining
A rock-type coal consisting of vitrinite (collinite or telinite) and other macerals, mainly exinite, and in which the other macerals exceed vitrinite in quantity. Compare: clarovitrain
Industry:Mining
A rod coupling built up to reaming-shell size by welding on an abrasion-resistant metal, applied in ridges parallel to the long axis of the drill rod.
Industry:Mining
