- 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 ...
No land can be a mining claim unless based upon a location; otherwise it may be mining ground or a mine. For instance, the bed of a navigable river is not subject to mining location, but if mining is conducted thereon by dredging, it is mining ground; or, where land is covered by an agricultural patent and worked for its mineral deposits, it is mining ground and not a mining claim. Hence, land from which a mineral substance is obtained from the earth by the process of mining may, with propriety, be called mining ground or mining land.
Industry:Mining
Inverted ridges of rock, usually sandstone, extending from the overlying strata into a coal seam, caused by localized streams active during the formation of the coal.
Industry:Mining
Each mineral species is a unique, naturally occurring combination of chemical composition and crystal system; e.g., graphite is hexagonal carbon and diamond is isometric carbon, and halite is isometric sodium chloride. (a) Thus, minerals may be classified according to their crystal system. (b) Minerals may be classified chemically according to Dana as (1) native elements and alloys; (2) sulfides, selenides, tellurides, arsenides, and antimonides; (3) sulfosalts, sulfarsenides, sulfantimonides, and sulfobismuthides; (4) halides; (5) oxides; (6) oxygen salts, carbonates, silicates, borates, etc.; (7) salts of organic acids; and (8) hydrocarbon compounds. Silicates are subdivided according to the structural arrangements of their (SiO<sub>4</sub>)<sub>4-</sub>tetrahedral groups and the number of corner oxygen ions shared between them (degree of polymerism). (c) Additionally, minerals may be classified into isostructural groups; e.g., spinel group, garnet group, mica group, pyroxene group, and zeolite group. (Structural classification is not entirely congruent with chemical classification, since some structural groups may contain more than one chemical group; e.g., the apatite group has mainly phosphates, but some arsenates, vanadates, and silicates have the apatite structure.) (d) Rutley classifies minerals according to group in accordance with the periodic table as regards dominant economic constituents. (e) Optically, minerals are classified as opaque (metallic luster) and nonopaque (transmit light in thin section). (f) Economically, minerals are classified as metallics if they are the source of metal from ores and nonmetallics if their products are not metals.
Industry:Mining
Corn. A quarry term to designate a direction along which there is no natural cleavage in a rock.
Industry:Mining
Cesaro's name for an orthorhombic form of guarinite, through superposition of hemitropic lamellae of the monoclinic mineral, clinoguarinite.
Industry:Mining
Coals containing over 32% volatile matter with a coal rank code No. 400 to 900.
Industry:Mining
Carbonification is the process by which the vegetable substances of peat were transformed in the partial absence of air and under the influence of temperature and pressure throughout geological time into lignite and subsequently into coal.
Industry:Mining
Coal that softens and agglomerates on heating and after volatile matter has been driven off at high temperatures; produces a hard gray cellular mass of coke. All caking coals are not good coking coals.
Industry:Mining
