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A geometallurgical approach to tailings management: an example from the Savage River Fe-ore mine, Western Tasmania

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Parbhakar-Fox, A ORCID: 0000-0002-3570-1195, Glen, J and Raimondo, R 2018 , 'A geometallurgical approach to tailings management: an example from the Savage River Fe-ore mine, Western Tasmania' , Minerals, vol. 8 , pp. 1-23 , doi: 10.3390/min8100454.

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Abstract

At the Old Tailings Dam (OTD), Savage River, Western Tasmania, 38 Mt of pyritic tailings were deposited (1967 to 1982) and have since been generating acid and metalliferous drainage (AMD). Mineral chemistry analysis confirmed high concentrations of refractory cobalt in pyrite (up to 3 wt %). This study sought to determine, through a series of bench scale tests, if Co could be liberated using biohydrometallurgical techniques. Four bulk tailings samples were collected across the OTD, from up to 1.5 m depth, targeting three sulphide-bearing facies. The study was conducted in four stages: (1) bacterial adaption using BIOX® bacteria; (2) biooxidation optimization with pH, temperature and Fe medium parameters tested; (3) flotation test work to produce a sulphide concentrate followed by biooxidation; and (4) Fe and Co precipitation tests. The BIOX® culture adapted to the bulk composite (containing 7 wt % pyrite) in ∼10 days, with biooxidation occurring most efficiently at pH 1.5–1.6 and 40 °C whilst the Fe medium concentration was identified as a less-controlling parameter. Flotation produced a 71% pyrite concentrate with total oxidation occurring after 14 days of biooxidation with 99% of Co leached. At pH 3, Co was effectively separated from Fe, however Ni and Cu were also present in the pregnant liquor solution and therefore required refining before production of cobalt hydroxide, the intermediate saleable product. This study shows that adopting a geometallurgical approach to tailings characterisation can identify if mine waste has commodity potential and how best to extract it therefore unlocking the potential for unconventional rehabilitation of AMD affected sites.

Item Type: Article
Authors/Creators:Parbhakar-Fox, A and Glen, J and Raimondo, R
Keywords: acid rock drainage, tailings, cobalt, mine rehabilitation, mine waste, reprocessing, biooxidation, acid and metalliferous drainage
Journal or Publication Title: Minerals
Publisher: MDPIAG
ISSN: 2075-163X
DOI / ID Number: 10.3390/min8100454
Copyright Information:

© 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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