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Overburden Waste Rock Iron Ore Mining In Minnesota

Jan 23 2004nbsp018332Open pit iron ore mining has occurred in Minnesota for over 100 years Lowgrade iron ore or taconite has been actively mined for the last 50 years During the process of mining taconite waste materials such as tailings surface overburden and waste rock are stockpiled or deposited on the land Minnesota reclamation laws require mining

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