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26 DOI: 10.37398/JSR.2021.650104 Abstract: Nickel (Ni) cobalt (Co) chromium (Cr) bearing magnetite deposit at Phokpur in Kiphire district of Nagaland is a rare type of occurrence associated with Naga Ophiolite Belt. The magnetite deposit is associated with ultramafic rocks and occurs at north-easternmost part of the ophiolite belt. The Naga Ophiolite Belt extends for about 90 km with width ranging from 4 to 15 km. Detailed field and laboratory studies reveal that the magnetite in the study area occurs as a tabular body at the top of the ophiolite sequence. Magnetite and chromite are observed as the two discrete mineral phases under ore microscopic studies of the magnetite samples. Concentration of nickel and chromium in the magnetite band ranges from 0.14 to 0.91 % and 1.33 to 3.79 % respectively, where as the iron content ranges from 40.51 to 55.95%. Small concentration of cobalt (0.008 to 0.14 %) is also present in the magnetite samples. With development of the state-of-the-art technology, the multi-metallic deposit of Phokpur, Nagaland containing nickel, cobalt, chromium and iron is ready for commercialization to extract the valuable metals in the product ‘Special Iron Alloy’. This will bring several benefits to the state of Nagaland and the country, as India depends on import for nickel and cobalt requirements.

Ni-Co-Cr-Bearing Phokpur Magnetite Deposit Associated with Naga Ophiolite Belt, NorthEast India and its Economic Viability