NDLI: Potential Hydrological Interaction of a Gold Mine and a Coal Mine in South Africa

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Potential Hydrological Interaction of a Gold Mine and a Coal Mine in South Africa

Content Provider	Springer Nature Link
Author	Vermeulen, P. D. Burger, M. Wyk, A.
Copyright Year	2013
Abstract	In Mpumalanga Province, South Africa, an underground coal mine lies above areas of a gold mine and there are concerns that preferential flow paths might connect the two mines, allowing flow from the coal mine into the gold mine. There is also a risk that subsidence associated with the coal mining will damage existing geohydrological barriers between the shallow Karoo aquifer where the coal mining takes place and the deeper Witwatersrand aquifer where the gold is mined. Damage to these geohydrological barriers could increase groundwater influx from the surface (gold mine slimes dams), as well as from the Karoo aquifer, into the Witwatersrand aquifer. Hydro-chemical sampling was used to determine interaction between the two aquifers. Certain high risk areas for potential interaction were identified after considering factors such as the depth and areas of mining, the location of tailings storage facilities, and preferential pathways.In der Mpumalanga Provinz in Südafrika befindet sich ein untertägiger Kohleabbau über einem Golderzbergwerk. Es gibt Hinweise, dass beide Bergwerke über präferenzielle Fließwege miteinander in Verbindung stehen und dass ein Grundwasserfluss aus dem Kohleabbau in das Golderzbergwerk existiert. Es besteht weiterhin ein Risiko, dass kohlenabbaubedingte Subsidenzbewegungen zu einem hydraulischen Kurzschluss zwischen dem flachen Karoo-Grundwasserleiter, in dem sich das Kohlebergwerk befindet, und dem tieferen Witwatersrand-Grundwasserleiter, in dem Golderze abgebaut werden, führen kann. Eine Verbindung beider Grundwasserleiter kann eine Erhöhung von Oberflächen- und Grundwasserzutritten in die Bergwerke sowohl von der Oberfläche, auf der sich Tailings aus der Golderzgewinnung befinden, als auch aus dem Karoo- in den Witwaterrand- Grundwasserleiter führen. Durch Untersuchungen der Grundwasserbeschaffenheit werden Wechselwirkungen zwischen beiden Grundwasserleitern nachgewiesen. Risikozonen für mögliche Kurzschlüsse werden nach der Analyse von Faktoren wie Tiefenlagen, Flächenbereiche der Bergbaubeeinflussung, Standorte der Tailings und präferentiellen Fließpfaden ausgewiesen.En la provincia de Mpumalanga, Sudáfrica, una mina de carbón subterránea descansa sobre una mina de oro. Existe preocupación de que vías de flujo preferencial podrían conectar ambas minas permitiendo el flujo desde la mina de carbón a la de oro. Hay también un riesgo de que el hundimiento provocado por la explotación de la mina de carbón dañe las barreras geohidrológicas existentes entre el acuífero superficial Karoo donde la explotación de carbón tiene lugar y el más profundo, acuífero Witwatersrand, dónde se realiza la explotación del oro. Los daños a estas barreras geohidrológicas podrían incrementar el flujo de agua desde la superficie hacia las aguas subterráneas (colas de barros de la mina de oro) y desde el acuífero Karoo hacia el acuífero Witwatersrand ubicado por debajo. El muestreo hidroquímico fue usado para determinar la interacción entre ambos acuíferos. Áreas de cierto riesgo de potencial interacción fueron identificadas después de considerar factores tales como la profundidad y las áreas de explotación minera, las facilidades para la ubicación de los depósitos de colas y las vías de paso preferenciales.在南非普马兰加(Mpumalanga)省,煤矿赋存于金矿之上。煤矿与金矿之间的水力联系是倍受关注的安全问题,人们担心煤矿水灌入金矿而引发灾难。煤矿采后沉陷可能破坏浅层Karoo 含水层(煤矿采动破坏带内)与深部Witwatersrand含水层(金矿采动影响范围内)之间的隔水层,而使Witwatersrand含水层接受地表金矿尾矿坝水和浅层Karoo 含水层水大量补给。通过水样测试与分析以确定了两含水层的之间的水力联系。基于开采深度与面积、尾矿堆积位置、优先流导水通道等影响因素的综合分析,划分出两含水层产生水力联系的潜在危险区。
Starting Page	3
Ending Page	14
Page Count	12
File Format	PDF
ISSN	10259112
Journal	Mine Water and the Environment
Volume Number	33
Issue Number	1
e-ISSN	16161068
Language	Chinese
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-08-31
Publisher Institution	International Mine Water Association (IMWA)
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Aquifer Conceptual model Inter-mine flow Groundwater Impact Geology Hydrogeology Sedimentology Energy Economics Ecotoxicology
Content Type	Text
Resource Type	Article
Subject	Water Science and Technology Geotechnical Engineering and Engineering Geology

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