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Montmorillonite is an example of high swelling clay minerals and kaolinite is an example of nonswelling clay minerals. It should be noted that swelling of clay minerals is most severe in fresh water. Another example of the deleterious effect of clay in flotation is processing boron ores. In most boron ores the major accompanying gangue

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Published by the American Geosciences Institute Environmental Awareness Series. How can metal mining impact the environment PDF version. Material adapted from: Hudson T.L Fox F.D. and Plumlee G.S. 1999. Operations and waste products associated with metal extraction and processing are the principal causes of environmental concerns

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Beneficiation of Iron Ores. Iron ore is a mineral which is used after extraction and processing for the production of iron and steel. The main ores of iron usually contain Fe2O3 (70 % iron hematite) or Fe3O4 (72 % iron. magnetite).

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