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Published 12/17/2013, Duluth News Tribune
Taconite is a form of lower-grade iron ore that has to be processed and concentrated to raise the iron content to levels high enough for steelmaking. Taconite production began in the 1950s in Minnesota and eclipsed naturally rich iron ore production by the 1970s. So-called natural ore is no longer mined in Minnesota.Word count: 53
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