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ore drift

См. также в других словарях:

  • drift´ing|ly — drift «drihft», verb, noun. –v.t. 1. to carry along by currents of water or air: »The current was drifting our boat onto the rocks. 2. to heap up; pile up: »The wind is so strong it s drifting the snow. 3. to enlarge or shape (a hole) with a… …   Useful english dictionary

  • Drift mining — is either the mining of a placer deposit by underground methods, or the working of coal seams accessed by adits driven into the surface outcrop of the coal bed. Drift is a more general mining term, meaning a near horizontal passageway in a mine,… …   Wikipedia

  • Ore shoot — is a colloquial term in mining and geology to describe a long seam of mineral or metal bearing rock that can be profitable to extract. The term may have originated in the 17th and 18th centuries when various theories existed on the origins of ore …   Wikipedia

  • drift mine — noun Etymology: drift (I) + mine : a placer or gravel deposit worked by underground mining methods * * * 1. a mine the opening of which is dug into an outcrop of coal or ore. 2. an underground placer mine. [1885 90, Amer.] …   Useful english dictionary

  • drift mine — 1. a mine the opening of which is dug into an outcrop of coal or ore. 2. an underground placer mine. [1885 90, Amer.] * * * …   Universalium

  • drift — I (New American Roget s College Thesaurus) n. pile, heap, deposit; movement, deviation; tendency, meaning.See assemblage, motion, direction. v. i. proceed aimlessly; pile up. II (Roget s IV) n. 1. [A tendency in movement] Syn. bent, tenor, trend …   English dictionary for students

  • Heavy mineral sands ore deposits — Heavy minerals (dark) in a quartz beach sand (Chennai, India). Heavy mineral sands are a class of ore deposit which is an important source of zirconium, titanium, thorium, tungsten, rare earth elements, the industrial minerals diamond …   Wikipedia

  • Gopher drift — Gopher Go pher, n. [F. gaufre waffle, honeycomb. See {Gauffer}.] (Zo[ o]l.) 1. One of several North American burrowing rodents of the genera {Geomys} and {Thomomys}, of the family {Geomyid[ae]}; called also {pocket gopher} and {pouched rat}. See… …   The Collaborative International Dictionary of English

  • mining — /muy ning/, n. 1. the act, process, or industry of extracting ores, coal, etc., from mines. 2. the laying of explosive mines. [1250 1300; ME: undermining (walls in an attack); see MINE2, ING1] * * * I Excavation of materials from the Earth s… …   Universalium

  • Underground mining (hard rock) — A three dimensional model of an underground mine with shaft access Underground hard rock mining refers to various underground mining techniques used to excavate hard minerals, mainly those containing metals[1] such as ore containing gold …   Wikipedia

  • Earth Sciences — ▪ 2009 Introduction Geology and Geochemistry       The theme of the 33rd International Geological Congress, which was held in Norway in August 2008, was “Earth System Science: Foundation for Sustainable Development.” It was attended by nearly… …   Universalium

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