- 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 ...
In structural petrology, three mutually perpendicular axes to which structural measurements are referred. a is the direction of tectonic transport, c is perpendicular to the plane along which differential movement takes place, and b lies in this plane but is perpendicular to a.
Industry:Mining
In sublevel caving, the crosscuts driven between every other slice from 18 to 36 ft (5.47 to 10.94 m) apart.
Industry:Mining
In sublevel stoping, term applied to a raise along the haulage level put up to the first sublevel. The raise is enlarged at the bottom into a grizzly chamber immediately over the haulage level and at the top is widened into a funnel-shaped opening. As ore is broken, it drops directly into a pull hole.
Industry:Mining
In sulfuric acid making, a tower filled with pieces of coke over which concentrated sulfuric acid trickles down. On meeting gas issuing from the lead chambers, the coke absorbs nitrous anhydride, which otherwise would be lost. Compare: Glover's tower
Industry:Mining
In sulfuric acid works, a tower through which the acid from the Gay-Lussac tower trickles and yields nitrous anhydride to the gases entering the lead chambers, at the same time cooling them. Compare: Gay-Lussac's tower
Industry:Mining
In surveying a curve with offset y, y = x<sub>3</sub>/ 6 l r, x being the distance from the tangent point, l the length of transition, and r the radius of circular arc.
Industry:Mining
In surveying, a line established parallel to the main survey line, and usually not far from it; e.g., a line on a sidewalk, 2 ft (0.6 m) from the established street line, or a line parallel to the centerline of a bridge and 50 ft (15.2 m) from it.
Industry:Mining
In surveying, a rod, usually 10 links (0.2012 m) long, used in measuring short offsets.
Industry:Mining
In surveying, a system that allows accurate final centering of the theodolite above (or below) its station by sliding the whole instrument on its stand (tribrach). Important with short sights where small centering errors could introduce serious inaccuracy.
Industry:Mining
In surveying, placing the sights for driving entries, drifts, or rooms nearer the working face.
Industry:Mining
