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    Underground mining Sub-surface mining (underground mining) is the way to go when the open pit mining operation becomes far too expensive. Mining companies decide whether or not to mine underground depending on the strip ratio of the land. If the ratio is too large, surface mining is too costly and sub-surface mining is the way to go.


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    The largest iron ore reserve is located in Australia. Brazil has the second largest iron ore reserves in the world, followed by Russia, China and India. The largest producer of iron ore in the world is China, followed by Australia, Brazil, India, and Russia.

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    Energy and Environmental Profile of the U.S. Mining Industry Underground Mining Underground mines are established in areas with promising ore deposits. Iron ore deposits may lie deep underground. A shaft must be dug from the surface and an elevator or hoist must be installed.

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  • Environmental impact of iron ore mining Wikipedia

    Iron ore is rock containing enough iron content, and in sufficient volume and accessibility to mining and transportation to be able to be economically mined. Iron in ore iron is most commonly found in the form of magnetite (Fe 3 O 4 ), hematite (Fe 2 O 3 ), goethite (FeO(OH)), limonite (FeO(OH)·n(H 2 O)) or siderite (FeCO 3 ).