Minnesota was famous for its softore mines, which produced a significant portion of the world's iron ore for more than a century. Although the highgrade ore is now depleted, taconite mining continues, using processes developed locally to save the industry. In 2016 the state produced 60 percent of the country's usable iron ore.

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Iron ore was discovered north of Mountain Iron, Minnesota on 16 Nov. 1890 by Nichols of the Merritt brothers. The range was defined by 1900. Initially underground mines were employed but these gave way to open pits so that by 1902, half the operations were conducted this way. The last underground mine closed in 1960. Natural ores eventually gave way to ironore .

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Iron ore was mined from nine active mines and three reclamation operations in Michigan, Minnesota, and of the iron ore was mined in northern Minnesota's Mesabi Range. Get Price. History Iron Ore Heritage Trail. The First Open Pit Mining Site – The Jackson Mine. Discovering iron ore was easier than mining it. This first open pit mine in the Lake Superior .

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20/02/2015 · A grinding mill is like a huge concrete mixer containing large steel balls which tumbles lumps of ore and breaks them down into smaller particles, a process necessary before separating the valuable minerals from the host rock. Heavy liners are attached to the inside of each mill to protect it from damage. The liners wear fast and require replacing on a regular .

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