- 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 ...
In apparently massive rock that is being quarried, a plane of potential fracture along which the rock may break during excavation.
Industry:Mining
In archaeology, the last division of the Stone Age, characterized by the development of agriculture and the domestication of farm animals. Correlation of relative cultural levels 2107 with actual age (and, therefore, with the time-stratigraphic units of geology) varies from region to region. Adj: pertaining to the Neolithic.
Industry:Mining
In assaying, the bullion bead resulting from cupellation of an auriferous or argentiferous lead button.
Industry:Mining
In assigning point groups to seven crystal systems, the trigonal system is characterized by a unique triad, that element of rotational symmetry for which three operations of 120 degrees return a lattice to identity. Compare: rhombohedral division; hexagonal system.
Industry:Mining
In assigning point groups to six crystal systems, those members of the hexagonal system that may be assigned rhombohedral crystallographic axes a <sub>r</sub>belong to the rhombohedral division of the hexagonal system. They have a unique triad, but not all point groups with a unique triad may be assigned rhombohedral axes; hence, not all trigonal point groups are rhombohedral. Compare: trigonal; trigonal system.
Industry:Mining
In attacking a rock face, the first effort of the miner is directed toward making a cut that will permit the succeeding shots to exert the greatest force with the minimum charge of explosive. In doing this unkeying, the miner takes advantage of any persistent seam in the rock face.
Industry:Mining
In ball milling, the peripheral speed at which part of the crop load breaks clear on the ascending side, and falls clear to the toe of the charge.
Industry:Mining
In ball milling, the theoretical rate of revolution at which the contents of the mill are centrifugally held at the circumference.
Industry:Mining
In beneficiation, one who tends rolls that are used to crush ore, which has already been broken into small pieces in a crusher, to a fine size preparatory to the extraction of the valuable minerals.
Industry:Mining
In beneficiation, smelting, and refining, a laborer who washes slime from cloth strainers, electrolysis tank debris, and collection barrels into a settling tank, using a water spray preparatory to recovery of precious metals from slime. Becoming obsolete.
Industry:Mining
