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Unexpected non-acid drainage from sulfidic rock waste

Citation

Gerson, AR and Rolley, PJ and Davis, C and Feig, ST and Doyle, S and Smart, RSC, Unexpected non-acid drainage from sulfidic rock waste, Scientific Reports, 9 Article 4357. ISSN 2045-2322 (2019) [Refereed Article]


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Copyright Statement

Copyright 2019 the authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

DOI: doi:10.1038/s41598-019-40357-4

Abstract

Most rock extraction sites, including mine sites and building construction sites, require a plan to assess, and mitigate if present, the risk of acid mine drainage (AMD). AMD is typically the major environmental concern where sulfide minerals are present in the excavated material and AMD prediction and remediation is based on internationally-accepted acid-base accounting (ABA) tests of representative field samples. This paper demonstrates that standardized ABA tests may not always be provide the correct AMD classification for commonly occurring waste rocks containing low-pyrite and -carbonate due to mineralogic assumptions inherent in their design. The application of these standard ABA tests at a copper mine site in South Australia resulted in the classification of a portion of its waste material as potentially acid forming in apparent contradiction to long term field measurements. Full definition of the sulfide and silicate minerals enabled re-evaluation of the weathering reactions occurring. The overall rate of neutralisation due to silicate dissolution was found to always exceed the rate of acid generation, in agreement with field observations. Consequently, the waste rock was redefined as non-acid forming. The methods developed represent a significant advance in AMD prediction and more strategic, cost-effective environmental planning, with potential for reclassification of wastes with similar characteristics.

Item Details

Item Type:Refereed Article
Keywords:sulfidic rock waste, acid mine drainage, acid-base accounting tests, environmental planning
Research Division:Earth Sciences
Research Group:Geology
Research Field:Geology not elsewhere classified
Objective Division:Environmental Management
Objective Group:Other environmental management
Objective Field:Other environmental management not elsewhere classified
UTAS Author:Feig, ST (Dr Sandrin Feig)
ID Code:152600
Year Published:2019
Web of Science® Times Cited:13
Deposited By:Research Performance and Analysis
Deposited On:2022-08-22
Last Modified:2022-09-20
Downloads:1 View Download Statistics

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