- 行业: Mining
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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 ...
The formation, essentially in the solid state, of new crystalline mineral grains in a rock. The new grains are generally larger than the original grains, and may have the same or a different mineralogical composition.
Industry:Mining
The formed serrated edges of the buckets used for digging purposes on a bucket loader.
Industry:Mining
The formed tools interspaced with the buckets of a bucket loader to aid in digging action.
Industry:Mining
The forms typically appearing on specimens of a mineral species or group, rarely all the forms permitted by its point group. Crystal habits range from highly diverse, e.g., calcite, to almost never showing crystal faces, e.g., turquoise. In addition to describing mineral habits with form names, e.g., prismatic, pyramidal, or tetrahedral, other names for appearances are used, e.g., fibrous, columnar, platy, or botryoidal. Intergrowths are given by specific description.
Industry:Mining
The formula expressing Ohm's law is I = E/R, in which I is the electric current in amperes; E is the electromotive force in volts; and R is the resistance in ohms.
Industry:Mining
The formula for pillar strength can be expressed as follows: S = C (L/T) <sub>1/2</sub>where the coefficient, C, is directly dependent upon friction, L is the least pillar width, and T is the thickness.
Industry:Mining
The foundations of machinery installed in a building should be so designed that the frequency of the machine is two times the natural frequency of the combined system of machines and foundations.
Industry:Mining
The four principal points of the compass--north, east, south, and west--are called the cardinal points. Midway between the cardinal points are the intercardinal points-- northeast, southeast, southwest, and northwest. Midway between each cardinal and intercardinal point is a point with a name formed by combining that of the cardinal and intercardinal point, the former being placed first, as north-northeast, east-northeast, and so forth. Midway between the points already indicated are points bearing the name of the nearest cardinal or intercardinal point followed by the word "by" and the name of the cardinal point in the direction in which it lies, as north by east, northeast by north, and so forth. In all, there are 32 points separated by intervals of 11-1/4 degrees . Each of these intervals is subdivided into quarter points.
Industry:Mining
The fourth period, in order of decreasing age, of the periods making up the Paleozoic era. It followed the Silurian period and was succeeded by the Mississippian period. Also, the system of strata deposited at that time. Sometimes called the Age of Fishes.
Industry:Mining
The fracture dome is the zone of loose or semiloose rock which exists in the immediate hanging or footwall of a stope. In some mines it may extend into the walls for a considerable distance. In a rock burst it becomes greatly extended.
Industry:Mining
