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Mining engineering
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===Mining process=== ; Blasting : [[Explosive]]s are used to break up a rock formation and aid in the collection of [[ore]] in a process called [[Rock blasting|blasting]]. Blasting [[Generally Accepted Accounting Practice (UK)|generally]] the heat and immense pressure of the detonated explosives to shatter and fracture a rock mass. The type of explosives used in mining is [[Explosive material#High explosives|high explosives]], which vary in composition and performance properties. The mining engineer is responsible for selecting and properly placing these explosives to maximize efficiency and safety. Blasting occurs in many phases of the mining process, such as the development of infrastructure and the production of the ore. An alternative to high explosives are Cardox blasting cartridges, invented in 1931,<ref>{{cite patent | country = GB | number = 386688 | title = Improvements in and relating to means for effecting discharge of explosive charges such as those of blasting cartridges | pubdate = 1933-01-13 | pridate = 1931-05-13 | inventor = | invent1 = David Hodge | invent2 = Cardox (Great Britain) Limited | url = https://worldwide.espacenet.com/patent/original-document?channel=espacenet_channel-b8a1b102-850c-4699-886e-b598d0a27b60}}</ref> and extensively used from 1932 in coal mines. The cartridge contains an 'energizer' which heats liquid carbon dioxide until it ruptures a bursting disk; then, a physical explosion of the [[supercritical fluid]]. ; Leaching : [[Leaching (metallurgy)|Leaching]] is the loss or extraction of certain materials from a carrier into a liquid (usually, but not always, a solvent). Mostly used in rare-earth metal extraction. ; Flotation : [[Froth flotation#Mining|Flotation]] (also spelled floatation) involves phenomena related to the relative buoyancy of minerals. It is the most widely used metal separating method. ; Electrostatic separation : [[Electrostatic separator|Separating]] minerals by electro-characteristic differences. ; Gravity separation : [[Gravity separation]] is an industrial method of separating two components, either a suspension or dry granular mixture, where separating the components with gravity is sufficiently practical. ; Magnetic separation : [[Magnetic separation]] is a process in which magnetically susceptible material is extracted from a mixture using a magnetic force. ; Hydraulic separation : Hydraulic separation is a process that uses the density difference to separate minerals. Before hydraulic separation, minerals were crushed into uniform sizes; minerals with uniform sizes and densities will have different settling velocities in water, which can be used to separate target minerals.
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