- 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 ...
A term used in the freezing method of shaft sinking. The surface around the shaft tends to heave owing to the formation of ice and the variation of temperatures. This uplift is sufficient to throw surface structures, such as winding towers, out of alignment. To enable corrections to be made, the tower bases may be mounted on grillages with facilities for jacking to keep the towers level.
Industry:Mining
A term used in the Joplin district, Missouri, and applied to horizontal, low-grade, disseminated zinc-lead deposits, covering an extensive area.
Industry:Mining
A term used in the Lake Superior region for an earthy, incoherent iron ore mainly composed of hematite or limonite (goethite) and containing 45% to 60% iron.
Industry:Mining
A term used in the Lake Superior region for rock containing disseminated native copper.
Industry:Mining
A term used in the Leadville district of Colorado for an altered dolomite rock that shows conspicuous banding (generally parallel to bedding) consisting of light-gray coarsely textured layers alternating with darker finely textured layers.
Industry:Mining
A term used in the Milford, NH, quarries to denote gneiss or any other rock in contact with granite.
Industry:Mining
A term used in the northern and parts of other coalfields in Great Britain to describe earnings or wages.
Industry:Mining
A term used in the slate industry with reference to roofing slate. A square is a sufficient number of any size to lay 100 ft<sub>2</sub>(9.29 m<sub>2</sub>) of roof, allowing the standard 3-in (7.62-cm) lap. The estimated weight of a square of 1/4-in (6.4-mm) slate is 1,000 lb (454 kg).
Industry:Mining
A term used in the Southeastern United States (esp. Florida and Georgia) for an unconsolidated or partly consolidated form of limestone, usually containing shells or shell fragments, with a varying percentage of silica. It hardens on exposure and is sometimes used as road metal. Also spelled limerock.
Industry:Mining
A term used in the Southwest United States for a favorable host rock for uranium, characterized by light yellow or gray color and by brown limonite stains.
Industry:Mining
