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Lowergrade sources of iron ore generally require beneficiation, using techniques like crushing, milling, gravity or heavy media separation, screening, and silica ...
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Ore smelting. In nature, iron, copper, lead, nickel and other metals are found in impure states called ores, often oxidized and mixed in with silicates of other metals.
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In the 18th century, diamond deposits were discovered in Brazil in small quantities, and later in Australia, Russia, and the United States.
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