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Revisit to graphite-tungsten deposits of East Godavari district, Andhra Pradesh

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Journal of the Geological Society of India

Abstract

The graphite-tungsten deposits under consideration in this study are located in the Burugubanda, Pydiputta, Tapasikonda, Marripalem and Madyaratigudem areas of the East Godavari district of Andhra Pradesh, India. These deposits were formed due to wide spread tectonothermal events associated with the evolution of Eastern Ghats Mobile Belt (EGMB). The graphite deposits of East Godavari district are epigenetic, rhombohedral fluid deposited type and are one of the four deposits of such type reported so far from Srilanka, Spain and England. The graphite deposits were formed due to granodioritic intrusion into the Narsipatnam shear zone, which caused migmatisation of khondalites along with mobilisation and concentration of graphite, as veins and lenses, into the graphite gneisses. The graphite gneisses were subsequently intruded by quartz rich pegmatites that were laden with tungsten mineralisation. The tungsten mineralisation occurs as thin bands, lenses, stringers and vein lets within the quartz matrix and also dispersed in the graphite gneisses. Inclusions of tungsten in graphite indicate that tungsten mineralisation succeeded graphite mineralisation. However, the low P-T phenomenon of tungsten (wolframite-ferberite) mineralisation resulted in low tenor of tungsten ore deposits (WO3: 0.10%). Rare earth elements (REE) are associated with tungsten mineralisation in these areas. During the present study, these graphite-tungsten deposits have been re-examined, in the backdrop of shelving graphite-tungsten projects in these areas. The feed for mineral beneficiation tests was decided on the basis of dispersion of tungsten in quartz and graphite rich fractions of the ore zone. The feed (ROM material) on beneficiation gave recovery of +75% graphite concentrate, tungsten concentrate of consistent chemical grade, besides recovery of sizeable REE concentrate. It also rendered use of unutilised graphite tailing dumps at beneficiation plants, thereby effecting conservation. Thus, the association of tungsten and REE with the entire graphite deposits along with their value addition during beneficiation, as by-product, revived opportunities to restart graphite mining in the Burugubanda, Pydiputta and Tapasikonda areas in particular and East Godavari district, in general, as an economically viable venture. This will initiate opening of graphite mines in other districts of Andhra Pradesh and energise economics of working graphite mines within EGMB, in the states of Jharkhand, Odisha and Tamil Nadu.

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  1. Department of Geology, RTM Nagpur University, Nagpur, 440 001, India

    Ramesh M. Umathay & Anil M. Pophare

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Umathay, R.M., Pophare, A.M. Revisit to graphite-tungsten deposits of East Godavari district, Andhra Pradesh. J Geol Soc India 84, 417–430 (2014). https://doi.org/10.1007/s12594-014-0147-6

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