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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/3348

Title: Hydrogeological assessment of Acid mine Drainage impacts in the West Rand Basin, Gauteng Province
Authors: Hobbs, PJ
Cobbing, JE
Keywords: Hydrogeological assessment
Acid mine drainage
Gold mines
West Rand basin, Gauteng Province
Groundwater
Mine water
Drainage
Morphology
Geology
Issue Date: Aug-2007
Publisher: CSIR
Citation: Hobbs, P.J. and Cobbing, J.E., 2007. Hydrogeological assessment of Acid mine Drainage impacts in the West Rand Basin, Gauteng Province. Report no.CSIR/NRE/WR/ER/2007/0097/C. CSIR/THRIP. Pretoria. South Africa, pp 109
Abstract: The comparatively short history of acid mine drainage (AMD) in the West Rand Basin (WRB) via mine water decant on the Randfontein Operations property (formerly Randfontein Estates Ltd) of Harmony Gold Mining Company west of Krugersdorp (Figure 1) is reasonably well documented (e.g. JFA, 2006; Coetzee, 2005). Decant first manifested on surface at a position very near borehole BH1 (Figure 1) on 27 August 2002 and later, on 3 September 2002, at the Black Reef Incline (BRI) shaft (Figure 1) some 200 m to the south (Du Toit, 2006). Initial estimates of the decant volume ranged between 7 ML/d in winter and 12.5 ML/d in summer (JFA, 2004). In early-2005, additional decant reported on surface at 18 Winze (Figure 1), an abandoned shaft to the east on the slope above the BRI (Coetzee, 2005). More recent estimates (Coetzee, 2005) put the rate of decant at between 18 and 36 ML/d. The subsequent development of a permanent water body in the Hippo Dam on the Tweelopie Spruit in the southern part of the Krugersdorp Game Reserve (KGR), together with the development of seeps and springs, reflects the more recent surface manifestation of mine void flooding and decant in the area. Prior to this, anecdotal evidence has it that the dam held water for only a few days before drying up, hence its other name of Dry Dam. The ramifications of decant for the subregion are enormous. The greatest focus in this regard is undoubtedly the Cradle of Humankind World Heritage Site (CoHWHS), which includes the home of “Mrs Ples” in the Sterkfontein Cave system. Of no lesser concern, however, are the downstream landowners and agricultural activities that are largely or wholly dependant on groundwater for potable and business use. In order to determine and implement the most appropriate acid mine water drainage management measure(s), it is necessary to first understand the hydrophysical environment that defines and informs the groundwater dynamic in the subregion. This dynamic includes the response of the groundwater regime to both natural and anthropogenic recharge mechanisms. The latter are predominantly mining related as might be associated with defunct underground workings, defunct and operational surface (opencast) workings and tailings dams. The interaction between surface water and groundwater represents another facet of this dynamic and, apart from AMD, also finds relevance in the discharge from two municipal waste water treatment works (WWTW), viz. the Randfontein WWTW to the southwest in the headwaters of the Riet Spruit, and the Percy Stewart WWTW on the Blougat Spruit to the northeast (Figure 1). The study reported herein explores this dynamic and ancillary issues by consolidating and comparing readily available historical data with “new” data sourced in early-2007
Description: CSIR 2007. All rights to the intellectual property and/or contents of this document remain vested in the CSIR. This document is issued for the sole purpose for which it is supplied. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by means electronic, mechanical, photocopying, recording or otherwise without the express written permission of the CSIR. It may also not be lent, resold, hired out or otherwise disposed of by way of trade in any form of binding or cover than that in which it is published
URI: http://hdl.handle.net/10204/3348
Appears in Collections:Water resources and human health
General science, engineering & technology

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