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Location: 2 km NE from Kamagaon, India
OMC House, Unit-VPO Box 34BhubaneswarIndia751001
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Banded iron formations of the Iron Ore Group (Archean greenstone belts) of Jharkhand-Orissa region, India host a good number of large iron ore deposits (Fe wt %> 62). Iron ore mineralization of Gandhamardan hill is one of them where iron ores occur in two stratigraphic horizons. One is strictly confined within banded iron formation (stratabound mineralization) with irregular geometry, and show fracture filling and replacement vein-type mineralization along the fringes of hard massive ores of the core. This type of mineralization is exposed along the western slope of the hill. Hard massive and laminated ores dominate this mineralization. The other type occurs as low dipping sheet like body above banded iron formation and covered by laterites forming the top of the hill. Flaky ores dominate this mineralization with formation of hard goethitic crust near the top. Both the mineralizations contain mineralized banded iron formation core-stones surrounded by hard massive or flaky iron ores. Hard massive ores are entirely represented by martite-microplaty hematite mineralogy. Hard laminated ores contain microplaty hematite and few martite grains representing early magnetites of the banded iron formation. Flaky ores are high porosity ores produced by leaching of silica, martite and microplaty hematite. Hard goethitic ores are developed due to replacement of martite and microplaty hematite or precipitation of goethite in the pore spaces.Banded iron formation associated iron ore mineralization of Gandhamardan hill occurs in two stratigraphic horizons, one as stratabound ore bodies of irregular shape in banded iron formation, exposed along the western slope of the hill and the other as a dipping sheet like ore body below a lateritic cover at the top of the hill. Occurrence of iron ores within banded iron formation, hydrothermal brecciation and replacement of jaspery blocks by iron ores, presence of mineralized banded iron formation core-stones within the massive hard ores and martite-microplaty hematite rich mineralogy of the ores are the unequivocal evidence in favour of hydrothermal origin for the Gandhamardan iron ore mineralization.
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