- Industry: Mining
- Number of terms: 33118
- Number of blossaries: 0
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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 stress normal to one of three mutually perpendicular planes that intersect at a point in a body on which the shearing stress is zero.
Industry:Mining
The stress or load per unit of area, usually taken per square inch of section. For instance, if a bar is 1 in by 2 in (2.5 cm by 5.1 cm) in section, the unit stress of the bar will be 1,000 divided by 2 (sectional area) or 500 psi (3.4475 MPa).
Industry:Mining
The stress produced in the outer fibers of a rope by bending over a sheave or drum.
Industry:Mining
The stress that exists in an elastic solid body in the absence of, or in addition to, stresses caused by an external load. Such residual stress may be due to: (1) deformation, caused by cold-working, as in drawing or stamping; (2) change in the specific volume due to thermal expansion, a phase change, or magnetostriction; (3) by the joining together of structural parts by force, such as welding.
Industry:Mining
The stresses existing in rock before the excavation of any mine opening. In general, these stresses are known to be influenced primarily by the weight of the overlying 1284 material, the relation of the opening of the rock masses around it (depth of overburden, etc.), the physical characteristics to the surrounding rock, and tectonic forces.
Industry:Mining
The striations, grooves, and polish on joints and fault surfaces. Compare: striation
Industry:Mining
The strike of a vein; direction of the horizontal line on which it cuts the country rock.
Industry:Mining
The strip area that includes area of pay material plus enough area beyond the limits of the ore pit to provide for a bench. The total volume of stripping will be that vertically above the limits of the ore pit plus that outside of the ore pit necessary to maintain safe strip-pit slopes and benches and provide working approaches to the pit.
Industry:Mining
The stripped (naked) proton of hydrogen, H+, or the proton combined with one or more molecules of water, as H<sub>3</sub>O<sub>+</sub>or H(H<sub>2</sub>O)<sub>+</sub>. The latter is sometimes called oxonium, hydroxonium, or hydronium ion. H+ is usually spoken of as the proton. H-ion concentration is the pH value.
Industry:Mining
The structure enclosing the top of a shaft designed to prevent short circuiting of air into or out of the shaft.
Industry:Mining
