- 行业: Mining
- Number of terms: 33118
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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 state or condition of occurring between strata of a different character.
Industry:Mining
The statement in fluid mechanics that a fluid buoys up a completely immersed solid so that the apparent weight of the solid is reduced by an amount equal to the weight of the fluid that it displaces.
Industry:Mining
The statement in thermodynamics that solution of a mineral tends to occur most readily at points where external pressure is greatest, and that crystallization occurs most readily at points where external pressure is least. It is applied to recrystallization in metamorphic rocks with attendant change in mineral shapes, such that mass is transferred from contact points to pressure shadows resulting in reduced rock porosity. It is named after the German physicist E. Riecke (1845-1915) although it was actually discovered and described by Sorby in 1863.
Industry:Mining
The statement that for any system in equilibrium, the number of degrees of freedom is two greater than the difference between the number of components and the number of phases. It may be symbolically stated as F = (C-P) + 2.
Industry:Mining
The statement that the centrifugal force produced by the rotation of the Earth (Coriolis force) causes a rotational deflection of currents of water and air to the right in the Northern Hemisphere and to the left in the Southern Hemisphere.
Industry:Mining
The static moment of a section about an axis, Y, is also termed the first moment of the area about the axis. It is the sum of the products obtained by multiplying each component of an area, A, by its distance, X, from Y.
Industry:Mining
The station or landing-place arranged for the full and empty tubs at the bottom of the winding shaft.
Industry:Mining
The statutory maximum gradient for locomotive haulage is 1:15, but ordinarily the practical limit is about 1:25. Roads driven specially for locomotives are normally graded about 1:400 in favor of the load, unless a steeper gradient is required for drainage.
Industry:Mining
The statutory requirements regarding the use of explosives in coal mines are very stringent. In gaseous mines only permissible (or permitted) explosives are allowed.
Industry:Mining
The steady-state irreversible potential of a metal or alloy in a constant corrosive environment.
Industry:Mining
