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    From 1890 to about 1980, 2.5 billion tons of this ore was mined here, but these “natural ores” were largely depleted by the 1980s. Landsat images acquired after 1984, however, show continued expansion of the openpit mines. The rock being mined now is a lower grade ore called taconite, which has about 25–30% iron content.

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    Cleveland Cliffs is our NorthGoing Zax. It’s the majority owner of Hibbing Taconite. And this Zax needs ore. Officials estimate that about three more years of ore remain within the current reach of the mining company, a dire deadline for more than 500 local miners and affiliated workers. U.S. Steel is our SouthGoing Zax.

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    From 1890 to about 1980, 2.5 billion tons of this ore was mined here, but these “natural ores” were largely depleted by the 1980s. Landsat images acquired after 1984, however, show continued expansion of the openpit mines. The rock being mined now is a lower grade ore called taconite, which has about 25–30% iron content.

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    Iron ore occurs naturally in a variety of forms, from sandlike iron fines to solid rock masses. Crude ore, or ore mined in the natural state, seldom occurs in a pure state and requires some form of beneficiation. Crude ore is commonly mixed with other minerals (gangue), which reduce the iron content.

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