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Geoenvironmental characterisation of the King River Delta: A combined geophysical, geochemical and mineralogical approach

Citation

Nascimento, SC and Parbhakar-Fox, A and Cracknell, MJ and Heng, WX, Geoenvironmental characterisation of the King River Delta: A combined geophysical, geochemical and mineralogical approach, Proceedings of the 15th SGA Biennial Meeting: Life with Ore Deposits on Earth, volume 4, 27-30 August 2019, Glasgow, Scotland, pp. 1611-1614. ISBN 9780852619643 (2019) [Refereed Conference Paper]

Copyright Statement

Copyright 2019 Society for Geology Applied to Mineral Deposits (SGA)

Official URL: https://www.sga2019glasgow.com/abstract

Abstract

The Mount Lyell Mining and Railway company discharged nearly 95 Mt of tailings and 1.4 Mt of slag from its copper, gold and silver production into the Queen River from 1916 to 1994. Approximately 87.4 Mt of tailings has accumulated at the King River Delta. This research presents a geoenvironmental characterisation of the King River Delta that combines geophysical, geochemical and mineralogical data. Apparent resistivity and shear wave (Vs) profiles suggest the baseline of the tailings at 3-5 m depth. Low resistivity values (i.e. < 2 Ωm) characterise the salt water intrusion, while resistivity values between roughly 5 to 12 Ωm. below 15 m depth, suggests bedrock boundaries. Scanning electron microscope (SEM) analysis of sediments identifies pyrite, chalcopyrite. muscovite, quartz. chlorite. barite. and iron oxides in the tailings. Additionally, chemical analysis indicates high content of S and heavy metals (e.g., Fe, Cu, Co, Ni and Zn), which contribute to rapid acid formation and risk of metal leaching into the surrounded environment, confirmed by geochemical static tests.

Item Details

Item Type:Refereed Conference Paper
Research Division:Earth Sciences
Research Group:Geochemistry
Research Field:Exploration geochemistry
Objective Division:Mineral Resources (Excl. Energy Resources)
Objective Group:Other mineral resources (excl. energy resources)
Objective Field:Other mineral resources (excl. energy resources) not elsewhere classified
UTAS Author:Nascimento, SC (Miss Sibele Nascimento)
UTAS Author:Parbhakar-Fox, A (Dr Anita Parbhakar-Fox)
UTAS Author:Cracknell, MJ (Dr Matthew Cracknell)
UTAS Author:Heng, WX (Mr Wei Xuen Heng)
ID Code:138804
Year Published:2019
Deposited By:CODES ARC
Deposited On:2020-04-30
Last Modified:2020-05-28
Downloads:0

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