Sustainable mining of natural vein graphite via acid-extraction from waste attached to rock pieces of vein banks by Asiri D. T. Medagedara, Poornima Dahanayake, Herath Mudiyanselage T. G. A. Pitawala, Buddika Karunarathne, K. Kanishka H. De Silva, Masamichi Yoshimura, Kosala P. Walikannage, Thennakoon Mudiyanselage W. J. Bandara, Rajapakse Mudiyanselage G. Rajapakse, Gamaralalage R. A. Kumara

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