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the decrease in iron ore extraction allows further significant savings in land usage possible, especially if an open cast method is used. reduction of coal and limestone, which are used in the blast furnaces, also result in significant land savings during their extraction and processing stages (similar to iron ore above).
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Get Pricetaconite is a low grade iron ore. when the high grade natural iron ore was plentiful, taconite was considered a waste rock and not used. but as the supply of high grade natural ore decreased, industry began to view taconite as a resource.
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