Integration of water chemistry and acidity components: a new AMD assessment model

Phong, Pham Hoang, Noller, Barry, Golding, Sue and Edraki, Mansour (2014). Integration of water chemistry and acidity components: a new AMD assessment model. In: H. Miller and L. Preuss, 8th AMD: Proceedings of the Eighth Australian Workshop on Acid and Metalliferous Drainage. AMD14: The Triennial 8th Australian Workshop on Acid and Metalliferous Drainage, Adelaide, SA, Australia, (411-422). 29 April – 2 May, 2014.

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Name Description MIMEType Size Downloads
Author Phong, Pham Hoang
Noller, Barry
Golding, Sue
Edraki, Mansour
Title of paper Integration of water chemistry and acidity components: a new AMD assessment model
Conference name AMD14: The Triennial 8th Australian Workshop on Acid and Metalliferous Drainage
Conference location Adelaide, SA, Australia
Conference dates 29 April – 2 May, 2014
Proceedings title 8th AMD: Proceedings of the Eighth Australian Workshop on Acid and Metalliferous Drainage
Place of Publication Indooroopilly, QLD, Australia
Publisher JKTech
Publication Year 2014
Sub-type Fully published paper
Open Access Status
ISBN 9780992485603
Editor H. Miller
L. Preuss
Start page 411
End page 422
Total pages 12
Collection year 2015
Language eng
Formatted Abstract/Summary
The aims of this study were to better understand the reactions giving AMD and quantify the release and transport of sulfate and acidity components from the interaction of water with mine wastes, and in situ mineralisation, at a closed sulfidic mine site in central north Queensland.

Water geochemistry and stable isotope techniques were used to identify origins and associations of different water types. The water chemistry and isotope results showed local mixing of tailings and waste rock seepage with groundwater system along inferred seepage zones. Stable isotope geochemistry of sulfate-sulfur has identified two distinct sources of sulfate contributing to downstream. The background water has clearly distinct δ34S-sulfate values compared to those from mine-related sulfides (+4.9 ‰ to +8.8 ‰), alunite group minerals (+8.0 ‰ to +9.8 ‰) and sulfate.

Improved titration methods giving both strong and weak mineral acidity contributions have been applied to determine the relative significance of various acidity components of mine-related water, namely the strong acidity by free proton ion and weak mineral acidity by hydrolysable metals. The acidity of low pH seepage from waste storage facilities is attributed to high concentrations of hydrolysable metals, namely Al3+, Cu2+, Fe(II), Zn2+ and Mn2+. Downstream water, evaporites and sediments have low to negligible acidities, which indicates the effectiveness of site water management measures and neutralising capacity of background surface and groundwater.

The study integrates the results from geochemistry of mine water, stable isotope geochemistry and acidity components to propose a mine water assessment model.
Q-Index Code E1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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Created: Thu, 26 Feb 2015, 13:03:10 EST by Mr Mansour Edraki on behalf of Centre For Mined Land Rehabilitation