- 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 series of beds deposited during a single sedimentary cycle of the type that prevailed during the Pennsylvanian period. The cyclothem, which ideally consists of 10 members (in western Illinois, the fifth member is a coal layer), indicates an unstable coastal environment in which marine submergence and emergence occurred. A cyclothem ranks as a formation in the scale of stratigraphic nomenclature.
Industry:Mining
A series of cars attached to and propelled by an endless chain or other linkage running on a horizontal or slight incline.
Industry:Mining
A series of clay and sand deposits in the Lower Cretaceous of southeast England; the Fairlight Clays at the base of these deposits have been used for brickmaking near Hastings and Bexhill.
Industry:Mining
A series of closely spaced props placed at the borders of the chamber at the coal face. Such an arrangement protects the future, adjoining chamber from caving.
Industry:Mining
A series of concentric and spheroidal or ellipsoidal cracks produced about compact nuclei in fine-grained, homogeneous rocks. Compare: exfoliation; spheroidal weathering.
Industry:Mining
A series of concentric and spheroidal or ellipsoidal cracks produced about compact nuclei in fine-grained, homogeneous rocks. Compare: exfoliation; spheroidal weathering.
Industry:Mining
A series of different igneous rocks that evolved from the same original magma through various differentiation stages.
Industry:Mining
A series of electrodes put out along a straight line on the surface and electrically interconnected, approx. the condition of continuous electrical contact with the Earth along that line.
Industry:Mining
A series of flat folds with near-horizontal axial planes contained entirely within a bed with undisturbed boundaries.
Industry:Mining
