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Development of a textural acid rock drainage index for classifying acid formation


Parbhakar-Fox, A and Edraki, M and Bradshaw, D and Walters, SG, Development of a textural acid rock drainage index for classifying acid formation, Proceedings of the 10th International Congress for Applied Mineralogy, 1-5 August 2011, Trondheim, Norway, pp. 513-521. ISBN 978-3-642-27681-1 (2011) [Refereed Conference Paper]

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Copyright 2012 Springer-Verlag Berlin Heidelberg

DOI: doi:10.1007/978-3-642-27682-8_61


Textural analyses are largely absent from predictive ARD (acid rock drainage) assessments despite the direct control of texture on acid formation. Therefore, the ARD Index (ARDI) was developed as a simple textural evaluation to be used as a stage-one test as part of an integrated geochemistry-mineralogy-texture (GMT) approach to predicting ARD. Parameters A, B and C (ranked from 0-10) examined contents, degree of alteration and morphology of sulphides, whilst parameters D and E (ranked from -5-10) evaluated the neutralising mineral content and the spatial relationship between acid forming and neutralising minerals. Scores from each category were totaled with values 50-41 considered as extremely acid forming (EAF); 40-31 as acid forming (AF); 30-21 as potentially acid forming (PAF); 20-10 as not acid forming (NAF); 10-0 as NAF/ANC and -1 to -10 as having acid neutralising capacity (ANC). The ARDI was tested using samples from an abandoned lode-gold mine and an operational iron-oxide copper gold mine, both located in Queensland, Australia. Samples were mesotexturally grouped (A-Q) and analysed as per the GMT approach. The ARDI identified group J (quartz-pyrite), H (quartz-arsenopyrite-pyrite) and G (quartz-galena-sphalerite) from the lode-Au operations as the most acid forming.

Item Details

Item Type:Refereed Conference Paper
Keywords:acid mine drainage, waste classification, mineralogy, texture
Research Division:Earth Sciences
Research Group:Geochemistry
Research Field:Exploration geochemistry
Objective Division:Environmental Management
Objective Group:Terrestrial systems and management
Objective Field:Evaluation, allocation, and impacts of land use
UTAS Author:Parbhakar-Fox, A (Dr Anita Parbhakar-Fox)
UTAS Author:Walters, SG (Dr Steve Walters)
ID Code:88774
Year Published:2011
Deposited By:Earth Sciences
Deposited On:2014-02-14
Last Modified:2017-11-02

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