- 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 ...
One of the pebbles or cobbles of sedimentary rock or of igneous rock occurring as an inclusion in a coalbed. One explanation for their occurrence is that they were attached to roots of floating trees rafted into the swamp during periods of high water.
Industry:Mining
One of the purest commercial forms of tin (99.89% purity) produced from alluvial ores in Malaysia.
Industry:Mining
One of the rate provisions in drilling contracts, specifying the compensation to the independent drilling contractor when drilling operations have been suspended at the request of the operator.
Industry:Mining
One of the rods, usually adjustable, which determine the digging angle of a blade or bucket.
Industry:Mining
One of the rolls through which puddled iron is run prior to being marketed.
Industry:Mining
One of the small crystals that often unite in parallel growths to build up larger crystals of the same general habit.
Industry:Mining
One of the small refractory-lined chambers, built wholly or partly in the wall of a kiln, for combustion of the fuel.
Industry:Mining
One of the small round or ovate accretionary bodies in a sedimentary rock, resembling the roe of fish, and having diameters of 0.25 to 2 mm (commonly 0.5 to 1 mm). It is usually formed of calcium carbonate, but may be of dolomite, silica, or other minerals, in successive concentric layers, commonly around a nucleus such as a shell fragment, an algal pellet, or a quartz-sand grain, in shallow, wave-agitated water; it often shows an internal radiating fibrous structure indicating outward growth or enlargement at the site of deposition. Compare: pisolith ovulite.
Industry:Mining
One of the small, round or ellipsoidal accretionary bodies in a sedimentary rock, resembling a pea in size and shape, and constituting one of the grains that make up a pisolite. It is often formed of calcium carbonate, and some are thought to have been produced by a biochemical algal-encrustation process. A pisolith is larger and less regular in form than an oolith, although it has the same concentric and radial internal structure. The term is sometimes used to refer to the rock made up of pisoliths. Compare: oolith
Industry:Mining
