Authors: Sinclair, EJP; Weber, P

Open access courtesy of:

DOI https://doi.org/10.36487/ACG_repo/2215_25

Cite As:
Sinclair, EJP & Weber, P 2022, 'Good acid and metalliferous drainage management begins well before mine closure: a New Zealand example', in AB Fourie, M Tibbett & G Boggs (eds), Mine Closure 2022: 15th International Conference on Mine Closure, Australian Centre for Geomechanics, Perth, pp. 375-388, https://doi.org/10.36487/ACG_repo/2215_25

Download citation as:   ris   bibtex   endnote   text   Zotero


Abstract:
Bathurst Coal Limited (Bathurst) owns and operates the Canterbury Coal Mine (the Mine), Canterbury New Zealand. The Mine was purchased in 2013, and during acquisition, it was identified that there were legacy issues associated with acid and metalliferous drainage (AMD). After operational activities started at the site, under the direction of Bathurst, a strategic approach to AMD management was undertaken to address this legacy AMD and also future potential issues. This included a staged response to characterise and schedule materials, assess AMD risks, and implement appropriate engineering controls (prevention minimisation, control and treat) to address these risks. This led to a significant reduction in AMD effects including an improvement in pH and a reduction in acidity loads for the site. When market and social license issues resulted in the decision to close the Mine in early 2021, the site was well placed to transition to mine closure. This paper covers the steps undertaken during the operation of the Mine to resolve the legacy AMD issues and minimise AMD impacts associated with ongoing operational activities such that a robust best practicable mine closure plan was possible that will ensure good long-term environmental outcomes with minimal active management requirements.

Keywords: acid and metalliferous drainage, mine closure, prediction, prevention, legacy, adaptive management

References:
Alipate, A 2005, Acid Mine Drainage Remediation Study at Malvern Hills Coal Mine Canterbury, BSc Honours Thesis, University of Canterbury, Christchurch.
AMIRA 2002, ARD Test Handbook – Project P387A Prediction and Kinetic Control of Acid Mine Drainage, AMIRA International Limited, Melbourne.
Bell, DH & Seale, JF 2004, ‘Settling pond design and performance – the Malvern Hills Coal Mine Experience’, New Zealand Branch AusIMM Conference, The Australasian Institute of Mining and Metallurgy, Melbourne, pp. 9–14.
de Boer, S 2005, Acid Mine Drainage Source Evaluation, Malvern Hills Coal Project, BSc Honours Thesis, University of Canterbury, Christchurch.
International Network for Acid Prevention 2014, Global Acid Rock Drainage Guide (GARD Guide) – Rev1 International Network for Acid Prevention,
Leckie, JMG 2017, ‘Environmental effects management and assessment – Adaptive management in the mining context’, New Zealand Annual AusIMM Branch Conference, The Australasian Institute of Mining and Metallurgy, Melbourne, pp. 96–104.
Robertson, C, Weber, P & Olds, W 2017, ‘AMD Passive Treatment System: A Case Study – Escarpment Mine, Denniston Plateau’, New Zealand Annual AusIMM Branch Conference, The Australasian Institute of Mining and Metallurgy, Melbourne, pp. 243–252.
Weber, P 2021, ‘Adaptive management: An essential process for AMD sites’, in M Edraki & D Jones (eds.), Proceedings of the Tenth Australian Workshop on Acid and Metalliferous Drainage, The University of Queensland, St Lucia, pp. 199–205.




© Copyright 2022, Australian Centre for Geomechanics (ACG), The University of Western Australia. All rights reserved.
Please direct any queries or error reports to repository-acg@uwa.edu.au