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Iron mining in the United States
Iron mining in the United States produced 15.5 million metric tons of iron ore in 2014, worth US$5.1 billion. Iron ore was the third-highest-value metal mined in the United States, after gold and copper.〔US Geological Survey, (Statistical summary ), 2012 Minerals Yearbook, July 2015.〕 Iron ore was mined from nine active mines and three reclamation operations in Michigan, Minnesota, and Utah. Most of the iron ore was mined in northern Minnesota’s Mesabi Range. Net exports (exports minus imports) were 7.5 million tons. US iron ore made up 1.8 percent of the total mined worldwide in 2014. Employment as of 2014 was 5,750 in iron mines and iron ore treatment plants.〔US Geological Survey, (Iron ore ), Jan. 2015.〕
US iron ore mining is dominated by the Precambrian banded iron formation deposits around Lake Superior, in Minnesota and Michigan; such deposits were also formerly mined in Wisconsin. For the past 50 years, more than 90 percent of US iron ore production has been mined from the Lake Superior deposits. None of the iron ore now mined in the US is “direct shipping” ore ready to be fed into the iron- and steel-making process. The ore is concentrated to raise the iron content before use. All the iron ore currently mined is from open pits.
==Minnesota==
Minnesota provides the great bulk of the iron ore mined in the US. Iron ore comes from seven open-pit mines, and two tailings reclamation operations, all in St. Louis County. Three of the mines are operated by Cleveland Cliffs, two by U. S. Steel, and one each by Mesabi Nugget Delaware LLC and Arcelor Mittal S.A. The two reclamation projects are operated by Magnetation, Inc.
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