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A critical review of acid rock drainage prediction methods and practices

Citation

Parbhakar-Fox, A and Lottermoser, BG, A critical review of acid rock drainage prediction methods and practices, Minerals Engineering, 82 pp. 107-124. ISSN 0892-6875 (2015) [Refereed Article]

Copyright Statement

Crown  2015 Published by Elsevier Ltd. All rights reserved.

DOI: doi:10.1016/j.mineng.2015.03.015

Abstract

Failure to accurately predict acid rock drainage (ARD) leads to long-term impacts on ecosystems and human health, in addition to substantial financial consequences and reputational damage to operators. Currently, a range of chemical static and kinetic tests are used to evaluate the acid producing nature of materials, from which risk assessments are prepared and waste classification schemes designed. However, these well-established tests and practices have inherent limitations, for example: (i) best-practice sampling is not pursued; (ii) risk assessments rely on limited static and kinetic test data, thus compromising the accuracy of resulting ARD block models; (iii) static tests are completed off-site and do not reflect actual field measurements; (iv) kinetic test data do not become available until later stages of mine development; (v) waste classification schemes generally categorise materials as only three types (i.e., PAF, NAF and UC) with other drainage forms (e.g., neutral metalliferous or saline) not considered; and (vi) conventional testing fails to consider that reactivity of waste is controlled by parameters other than chemistry (e.g., microbiology, type and occurrence of minerals, texture and hardness). Thus, accurate prediction is challenging because of the multifaceted processes leading to ARD. Hence, risk assessments need to consider mineralogical, textural and geometallurgical rock properties in addition to predictive geochemical test data. Instead, a new architecture of integrative, staged ARD testing should be pursued. Better ARD prediction must start with improving the definition of geoenvironmental models and waste units. Then, a range of low-cost and rapid tests for the screening of samples should be conducted on site prior to the performance of established tests and advanced analyses using state-of-the-art laboratories. Such an approach to ARD prediction would support more accurate and cost-effective waste management during operation, and ultimately less costly mine closure outcomes.

Item Details

Item Type:Refereed Article
Keywords:acid rock drainage, prediction, waste management, environment
Research Division:Earth Sciences
Research Group:Geochemistry
Research Field:Exploration Geochemistry
Objective Division:Environment
Objective Group:Land and Water Management
Objective Field:Mining Land and Water Management
Author:Parbhakar-Fox, A (Dr Anita Parbhakar-Fox)
Author:Lottermoser, BG (Professor Bernd Lottermoser)
ID Code:99641
Year Published:2015
Web of Science® Times Cited:19
Deposited By:Earth Sciences
Deposited On:2015-03-31
Last Modified:2017-11-02
Downloads:0

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