Economic Performance of Active and Passive AMD Treatment Systems Under Uncertainty: Case Studies from the Brunner Coal Measures in New Zealand

Ermittlung der wirtschaftliche Leistungsfähigkeit von aktiven und passiven AMD-Behandlungssystemen unter Berücksichtigung von Unsicherheiten: Fallstudien aus den stillgelegten Brunner-Kohlebergwerk in Neuseeland

Rendimiento económico de los sistemas de tratamiento activo y pasivo de la DMA en discusión: Estudios de casos de las medidas del carbón de Brunner en Nueva Zelandia

不确定条件下主动和被动AMD处理系统的经济运行:新西兰Brunner煤层案例研究

Abstract

Acid mine drainage (AMD) often requires management long after mining operations have ceased. Cost-effective long-term passive treatment systems (PTS) are required for closure of mine sites. However, PTS research seldom defines well-constrained operational and financial parameters to enable confident decision making by mining companies. PTS are generally assumed to be a lower-cost alternative to active systems when used in favorable circumstances, but there is little objective information to define when they are more suitable than active treatment. Instead, general ‘rules-of-thumb’ for flow rates or acid loads are used to determine when PTS are best used. We used well-characterized AMD from multiple historic and active coal mine sites in New Zealand to test these rules-of-thumb from a financial perspective by modelling capital and operational costs over a 100 year timeframe. We present static and uncertainty-based cost assessments of a mussel shell reactor PTS compared to typical active AMD treatment systems at six mine drainage sources from the Brunner Coal Measures. We show that for expected AMD characteristics and duration of treatment, savings on operational costs with PTS can exceed the higher initial capital costs. In addition, the financial advantage of PTS over time may be achieved at flow rates and acidity loads that exceed the industry rules-of-thumb PTS limits. However, in some circumstances, cost projections for high up-front capital costs of purchasing all treatment media for the life span of the PTS is less favorable than discounted treatment media in active treatment systems over time. Understanding financial models of AMD treatment options during mine site design can help reduce the costs of operating and closing mine sites.

Zusammenfassung

Saures Grubenwasser (Acid Mine Drainage, AMD) erfordert eine Behandlung oft noch lange Zeit nach dem Ende des Bergbaus. Dafür sind kosteneffiziente langzeitbeständige passive Behandlungssysteme (Passive Treatment System, PTS) erforderlich. In den Untersuchungen zu PTS werden jedoch nur selten betriebliche und finanzielle Kriterien genannt, die den Bergbauunternehmen eine sichere Entscheidungsfindung ermöglichen. Im Allgemeinen wird davon ausgegangen, dass PTS unter entsprechenden Umständen eine kostengünstige Alternative zu aktiven Wasserbehandlungssystemen darstellen. Aber es gibt nur wenige objektive Informationen, die definieren, wann PTS vorteilhafter sind als eine aktive Wasserbehandlung. Stattdessen werden nur allgemeine Faustregeln für Durchflussraten oder Säurefrachten verwendet, die bestimmen, wann PTS am besten eingesetzt werden können.

Resumen

El drenaje ácido de minas (DAM) a menudo requiere una gestión mucho después de que las operaciones mineras hayan cesado. Para ello, se requieren sistemas de tratamiento pasivo a largo plazo (PTS) rentables para el cierre de las minas. Sin embargo, dentro de la investigación de los PTS usualmente no se definen parámetros operativos y financieros específicos para permitir a las empresas mineras tomar decisiones con certeza. En general, se supone que los PTS son una alternativa de menor costo a los sistemas activos cuando se utilizan en circunstancias favorables, pero hay poca información objetiva para definir cuándo son más adecuados que el tratamiento activo. En cambio, se utilizan “reglas generales” para los caudales o las cargas ácidas para determinar cuándo es mejor utilizar el PTS.

抽象

通常,即使在采矿已经停止很久之后,我们仍需要管理矿井排放的酸性废水(AMD)。矿场闭坑需要建立能够有效控制成本的长期被动处理系统(PTS)。然而,被动处理系统(PTS)很少详细限制系统运行参数与财务参数,让采矿公司做出这个自信决策。虽然人们通常认为被动处理系统(PTS)是在一定环境条件下较主动处理系统更低成本运行的系统,但是几乎没有客观信息能够帮助确定被动处理系统(PTS)在什么情况下才比主动修复系统更合适。相反,人们只是简单地利用流量或酸负荷的经验法判断被动处理系统(PTS)的最佳适用条件。

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Acknowledgements

This research was financed by the Ministry for Business, Innovation and Employment, contract CRLE 1403. We thank Ngati Hako, Ngatiwai, Ngai Tahu, West Coast Regional Council, Waikato Regional Council, Northland Regional Council, Dept. of Conservation, Straterra, Minerals West Coast, Oceana Gold, Newmont, Solid Energy of New Zealand, Francis Mining Group, and Bathurst Resources for their involvement and support of the research programme. More information on the Centre for Minerals Environmental Research (CMER) is available at: http://www.crl.co.nz/cmer/.

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Eppink, F.V., Trumm, D., Weber, P. et al. Economic Performance of Active and Passive AMD Treatment Systems Under Uncertainty: Case Studies from the Brunner Coal Measures in New Zealand. Mine Water Environ (2020). https://doi.org/10.1007/s10230-020-00710-w

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Keywords

  • Passive treatment system
  • Active treatment
  • Cost-effectiveness
  • Closure
  • Geochemistry
  • Mussel shell reactor