- 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 ...
Coalbed separated by clay, shale, or sandstone parting that thickens so that both benches cannot be mined together.
Industry:Mining
Coal-cutting machine of the pick machine and breast machine type. They are called intermittent cutters because they must be frequently reset, whereas with continuous 1627 cutters, a continuous cut can be made the full width of the face without stopping the machine.
Industry:Mining
Coal-cutting machine that cuts coal with a series of steel bits set in an endless chain moved continuously in one direction either by an electric or a compressed-air motor. These machines may be divided into four classes, known as breast machines, shortwall machines, longwall machines, and overcutting machines.
Industry:Mining
Coal-cutting machine which acts percussively, and cuts with a large chisel fixed at the end of a piston reciprocated by compressed air in much the same way as a rock drill is operated.
Industry:Mining
Coal-cutting machines such as the shortwall cutter, longwall cutter, and overcutting machines. They are known as continuous cutters because a continuous cut can be made the full width of the face without stopping these machines, while machines of the intermittent variety must be frequently reset.
Industry:Mining
Coalescing and adhering in flocks. A cloudlike mass of precipitate in a solution. From the Latin floccus, meaning lock of wool.
Industry:Mining
Coalfields formed by forests on higher ground being carried away by floods into lakes.
Industry:Mining
