- 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 mineralogy, having or consisting of lamellae arranged in groups resembling stars.
Industry:Mining
In mineralogy, the end of a crystal, esp. crystal faces that intercept the crystallographic axis, as distinguished from a broken or polished end. Crystals are singly terminated if faces appear on one end as in attached crystals or ones lacking the symmetry to require faces on both ends to complete a crystal form; they are doubly terminated if faces appear on both ends.
Industry:Mining
In mining law, a leased area for phosphate lands may not exceed 2,560 acres (1,034 ha). A certain expenditure for mine development and operations is required. A royalty of not less than 2% of the gross value of the output must be paid, and an annual rental, similar to that for coal lands, is imposed.
Industry:Mining
In mining operations, such as tunnel driving, shaft sinking, and coal winning, there are certain tasks that must be repeated in cyclic fashion. In tunnel driving, they are (1) drilling the round; (2) charging and firing; (3) loading; and (4) supporting and track extension. This cycle of operations is time analyzed to achieve maximum efficiency and speed.
Industry:Mining
In mining, a falling of the mine roof or a heave of the mine floor due to the pressure of overlying strata. Compare: creep
Industry:Mining
In mining, a laborer who assists a timberman in erecting supports for the roof of a mine, using posts, headers, cap pieces, and wedges.
Industry:Mining
