- Industry: 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 ...
In coal, that part of the axis of a vascular plant that surrounds the central cylinder and is separated from the cylinder by the endodermis, and limited on the outside by the epidermis.
Industry:Mining
In coal, the outer conducting part of the central cylinder or vascular tissues. It consists primarily of sieve tubes and companion cells, phloem fibers or bark fibers, stone cells, and parenchymatous cells.
Industry:Mining
In coal, the ratio of the volatile matter to the sum of the volatile matter and the fixed carbon.
Industry:Mining
In comminution, rolls are choke fed when fed all of the material that they will take. The product of choke-fed rolls is never so uniform as when free feeding is used. Choke feeding is used only on feed of diameter about 1/4 in (0.6 cm) or less. Compare: free fed
Industry:Mining
In comminution, rolls are said to be free fed when fed only enough material to keep a ribbon of ore between the rolls. This results in a remarkably uniform product. Compare: choke fed
Industry:Mining
In conditioning a flotation pulp, addition of soluble alkaline sulfides in aqueous solution to produce a sulfide-metal layer on an oxidized ore surface.
Industry:Mining
In connection with use of moderate pressure hydraulic water (e.g., in classification of ore pulps), a reservoir set above the draw-off points of the system, which maintains a full supply of water at a set height and therefore constant pressure.
Industry:Mining
In continuous wire-line core drilling, a term applied to boreholes 3,000 ft (915 m) or more in depth.
Industry:Mining
In contrast to "mull", a type of forest soil in which the humus layer forms a dense carpet over the soil. Synonymous with raw humus.
Industry:Mining
In contrast with choke feed, feed that is throttled back to a value below the full capacity of the crusher.
Industry:Mining
