underground shaft
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Underground living — refers simply to living below the ground s surface, whether in naturally occurring caves or in built structures.Besides its obvious novelty, underground living offers additional benefits when compared to living in traditional buildings, such as a … Wikipedia
Underground mining (soft rock) — refers to a group of underground mining techniques used to extract coal, oil shale and other minerals or geological materials from sedimentary ( soft ) rocks. Because deposits in sedimentary rocks are commonly layered and relatively less hard,… … Wikipedia
Shaft — can refer to: Edwin Shaft WhiteLong narrow passages: * Edwin White * Elevator shaft * Ventilation shaft * Pitch (vertical space), a significant underground vertical space in caving terminology * Shaft mining * Shafting, illicit travelling through … Wikipedia
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
Shaft mining — Abandoned mine shafts in Marl, Germany. A … Wikipedia
Underground nuclear testing — Preparation for an underground nuclear test at the Nevada Test Site in the 1990s. Nuclear weapons … Wikipedia
Underground Electric Railways Company of London — Geographic map of the UERL s three deep level tube lines in 1907 Part of a series of article … Wikipedia
Shaft (New Zealand band) — Infobox musical artist Name = Shaft Img capt = Img size = Landscape = Background = group or band Birth name = Alias = Born = Died = Origin = New Zealand Instrument = Voice type = Genre = Rock n Roll Indie Occupation = Years active = 1992 present… … Wikipedia
shaft — I. noun (plural shafts) Etymology: Middle English, from Old English sceaft; akin to Old High German scaft shaft, Latin scapus shaft, stalk, Greek skēptesthai to prop oneself, lean Date: before 12th century 1. a. (1) the long handle of a spear or… … New Collegiate Dictionary
Underground mine ventilation — Schematic of underground mine ventilation Underground mine ventilation provides a flow of air to the underground workings of a mine of sufficient volume to dilute and remove noxious gases (typically NOx, SO2, methane, CO2 and CO). The source of … Wikipedia
shaft — 1. Vertical, or steeply inclined, sections of a cave passage, of enormously varied size. The world’s deepest known shaft is the entrance shaft of Brezno pod Velbom on the Kanin plateau, Slovenia; it is 501m deep, with no ledges. Much debate… … Lexicon of Cave and Karst Terminology
