Acid mine drainage analysis for the Reddale Coal Mine, Reefton, New Zealand

Olds, WE; Weber, P.A.; Pizey, MH; Pope, James Gray

doi:10.1080/00288306.2016.1148056

Cited by 8 publications

(4 citation statements)

References 9 publications

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“…6 it can be seen that, samples with high ANC values have low MPA values and vice versa. This affirms the work done by numerous researchers (Schumann et al, 2012;Olds et al, 2016;Assawincharoenkij et al, 2017), indicating that once neutralising minerals are dominant in a sample, little or no acid is produced, since these minerals such as dolomite are able to buffer the acid produced. Similarly, once the MPA values are higher than that of ANC, it implies that the dominant minerals are acid generating hence, acid may be produced upon exposure to favourable oxidising conditions.…”

Section: Net Acid Producing Potential (Napp)supporting

confidence: 89%

Determining Acid and Metalliferous Drainage Potential of Waste Rock on a Mine

Fosu¹,

Owusu²,

Ntsiful³

et al. 2020

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Acid and Metalliferous Drainage (AMD) is recognised as serious environmental problem in the mining industry. This is because environmental issue of AMD poses serious threat to water quality, vegetation cover and social licence of the mining operations. AMD occurs when reactive sulphide bearing materials are exposed to oxidising conditions. It has now become imperative for some mining companies to test sulphide bearing minerals for their AMD potential before major mining excavations are done. This work determines the AMD potential of fifty (50) waste rock samples from a Mine using Acid Base Accounting (ABA) techniques. Mineralogical studies on the sample indicated that the major sulphide mineral assemblages present were pyrite, arsenopyrite and chalcopyrite. Paste pH showed that 20% of the samples had undergone weathering and as such AMD generation had already started. Approximately 22% of the sample had conductivity levels between 1000 to 10,000 µS/cm and this shows a typical AMD chemical characteristic of high salinity. Acid Base Accounting showed that 32% of the samples were acid generating. Exactly 16% were non-acid forming and 52% were uncertain. The analysis showed that the potential for AMD generation exists for the waste rock material and can affect the local environment, specifically water quality if preventive measures are not taken. Keywords: Sulphide, Waste Rock, Acid Base Accounting, Paste pH, Conductivity

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Section: Net Acid Producing Potential (Napp)supporting

confidence: 89%

Determining Acid and Metalliferous Drainage Potential of Waste Rock on a Mine

Fosu¹,

Owusu²,

Ntsiful³

et al. 2020

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“…The pH of groundwater is related to the geological environment in which it is located. For water accumulating in the goaf, the change in pH is a result of water-rock interaction and has an important influence on the changes of the components in the water [33]. O 2 is a common oxidant in groundwater [34], and changes in DO concentration in water in a relatively closed extraction zone system can affect the type and intensity of water-rock interaction and the redox environment of the water body [35].…”

Section: Changes In Hydrochemical Characteristics Of Goaf Watermentioning

confidence: 99%

Mechanism of Changes in Goaf Water Hydrogeochemistry: A Case Study of the Menkeqing Coal Mine

Zhao

Sun

2022

IJERPH

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Goaf water in mining areas is widely found in China’s coal mines. To clarify the hydrogeochemical characteristics of goaf water and the influence mechanism of water–rock interaction and further reveal microbial action on the formation of goaf water quality, the goaf water in the Menkeqing coal mine was taken as the object, and physical modeling was used to simulate the process of the real goaf changing from an oxygen-sufficient environment to an anoxic environment with the rise of groundwater level in this work. The experimental results showed that the water–rock interaction in the goaf was mainly the dissolution–precipitation of minerals in the rocks of the caving zone and fracture zone, cation exchange, and oxidation of pyrite in the coal layer. The primary sources of Na+ and K+ in the goaf water were the dissolution and reverse ion exchange of silicate minerals such as albite and potassium feldspar, while Ca2+ and Mg2+ mainly from the dissolution of minerals such as calcium feldspar, calcite, and chlorite. The oxidation of pyrite in coal was the main reason for the increase in SO42− concentration, the enhancement of reduction, and the decrease in pH and DO (dissolved oxygen) in the goaf water. Relative abundance of sulfate-reducing bacteria (SRB) in goaf (e.g., Desulfosporosinus, Desulfobacterium, etc.) increased gradually, inhibiting the increase in SO42− concentration in goaf water through the devulcanization of SRB. The inverse hydrogeochemical modeling was performed using PHREEQC for two stages of the simulation experiment: 0–30 days and 30–300 days. The simulation results show that the water–rock action in the formation of goaf water mainly occurred in the simulation experiment’s early stage (0–30 days), and the mineral dissolution is dominant throughout the experimental stage. The results of the study provide a theoretical reference for the prediction of highly mineralized water pollution in goaf and its prevention and control.

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“…Active systems were assumed to use conventional lime (Ca(OH) 2 ) based treatment. At Bellvue, Escarpment, Whirlwind, and Herbert, construction costs were assumed to be the same as the known costs of an active system installed at the Reddale coal mine (Olds et al 2016). The AMD characteristics of Reddale are comparable to those of these four sites.…”

Section: Cost Models For Passive and Active Amd Treatment Systemsmentioning

confidence: 99%

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

Eppink¹,

Trumm²,

Weber³

et al. 2020

Mine Water Environ

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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.

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Acid mine drainage analysis for the Reddale Coal Mine, Reefton, New Zealand

Cited by 8 publications

References 9 publications

Determining Acid and Metalliferous Drainage Potential of Waste Rock on a Mine

Determining Acid and Metalliferous Drainage Potential of Waste Rock on a Mine

Mechanism of Changes in Goaf Water Hydrogeochemistry: A Case Study of the Menkeqing Coal Mine

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

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