Chemical decomposition produced by passing an electric current through a liquid or solution containing ions - Electrolysis, A naturally occurring solid material from which a metal or valuable mineral can be profitably extracted - Ore, A metal made by combining two or more metallic elements, esp. to give greater strength or resistance to corrosion - Alloy, The removal of oxygen by heating withh carbon - reduction, The process of corroding metal, stone, or other materials - corrosion, A more reactive metal takes the place of another in a coumpound - displacement, the planting (and subsequent harvesting) of vegetation that will selectively concentrate specific metals from the soil into their tissues - phytomining, The dissolution of metals from their ores by the use of microorganisms such as bacteria - bioleaching, Extract (metal) from its ore by a process involving heating and melting - smelting, rock in which aluminum is found in high concentrations. - bauxite, The degree of compactness of a substance - density, The presence in or introduction into the environment of a substance or thing that has harmful or poisonous effects - pollution, a large quarry where a large pit is excavated on the Earth's surface to remove rock. - open-cast mines, Ores that have low amounts of mineral - low grade ores, The minimum grade of ore used to establish reserves. - cut off grade, 1) Convert (waste) into reusable material - recycle,

copper extraction

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