- المجال: Mining
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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 grayish-green and silky, fibrous, or splintery variety of serpentine; near Baltimore, MD.
Industry:Mining
A grayish-white lustrous metallic element. Symbol, Zr. Occurs widely, but only in combined form, esp. in the minerals zircon, (ZrSiO<sub>4</sub>), and baddeleyite, (ZrO<sub>2</sub>). Uses include resisting corrosion, as a structural material in nuclear reactors, as an alloying agent, deoxidizer, bonding agent, refractory material, and in low-temperature superconductive magnets.
Industry:Mining
A grayish-white, metallic element occurring in argyrodite, a sulfide of germanium and silver; and in germanite, zinc ores, and coal. Its presence in coal ensures a large reserve of the element in the future. Symbol, Ge. It is a very important semiconductor material. Also used as an alloying agent, a phosphor, a catalyst, and for infrared detectors and optical equipment.
Industry:Mining
A graywacke characterized by abundant unstable materials; specif. a sandstone containing a variable amount (generally less than 75%) of quartz and chert and 15% to 75% detrital-clay matrix, and having rock fragments (primarily of sedimentary or lowrank metamorphic origin) in greater abundance than feldspar grains (chiefly sodic plagioclase, indicating a plutonic provenance).
Industry:Mining
A graywacke characterized by abundant unstable materials; specif., a sandstone containing generally less than 75% of quartz and chert and 15% to 75% detrital clay matrix, and having feldspar grains (chiefly sodic plagioclase, indicating a plutonic provenance) in greater abundance than rock fragments (indicating a supracrustal provenance) (Pettijohn, 1954; 1957). Compare: lithic graywacke.
Industry:Mining
A gray-white, hard, brittle metallic element. Symbol, Mn. Manganese does not occur uncombined in nature, but its minerals are widely distributed. Pyrolusite (MnO<sub>2</sub>) and rhodochrosite (MnCO<sub>3</sub>) are the most common minerals. The discovery of large quantities of manganese nodules on the ocean floor, containing about 24% manganese, holds promise as a source of manganese. Used to form many important alloys, esp. with steel, aluminum, and antimony; used in dry cells and glass, and in the preparation of oxygen, chlorine, and medicines.
Industry:Mining
A greasy, wax-yellow to reddish-brown weakly radioactive mineral, (Ce,La)(CO<sub>3</sub>)F , most commonly found in contact zones, less often in pegmatites; found associated with allanite, cerite, tysonite, fluorite, and tornebohmite; hexagonal; obtained from Ryddarhyttan and Finbo, Sweden; Pikes Peak, CO, and Mountain Pass, CA.
Industry:Mining
A greasy, wax-yellow to reddish-brown weakly radioactive mineral, (Ce,La)(CO<sub>3</sub>)F , most commonly found in contact zones, less often in pegmatites; found associated with allanite, cerite, tysonite, fluorite, and tornebohmite; hexagonal; obtained from Ryddarhyttan and Finbo, Sweden; Pikes Peak, CO, and Mountain Pass, CA.
Industry:Mining
A great intrusive igneous body in the Transvaal, South Africa, that has undergone remarkable magmatic differentiation. It is by far the largest layered intrusion known. The Bushveld is the leading source of chromite.
Industry:Mining
A great soil group in the 1938 classification system; a group of zonal soils having an organic mat and a very thin organic-mineral layer overlying a gray, leached A2 horizon and a dark brown, illuvial B horizon enriched in iron oxide, alumina, and organic matter. It develops under coniferous or mixed forests or under heath, in a cool to temperate moist climate. Also spelled Podsol. Spelled "podzol" when used as the soil type belonging to the Podzol group. Etymol: Russian podsol, ash soil.
Industry:Mining
