Govender, K, van Zyl, A & Bezuidenhout, N 2008, 'Prediction of Seepage Emanating from a Residue Disposal Facility for Various Closure Options', in AB Fourie, M Tibbett, I Weiersbye & P Dye (eds), Mine Closure 2008: Proceedings of the Third International Seminar on Mine Closure
, Australian Centre for Geomechanics, Perth, pp. 475-486, https://doi.org/10.36487/ACG_repo/852_43
A source-term (also referred to as source) characterization study was completed in support of closure design
and engineering for a residue disposal facility (RDF). The RDF contains different process waste streams
from a zinc processing company in South Africa. The objective of the study was to develop a source-term
model that simulates seepage fluxes and loads from the RDF footprint during the operational and closure
phases. The integrated mass transfer model developed provided a mass loading per footprint area and was
used as a source input to the numerical groundwater model. The model was developed to assess the
incremental change of seepage fluxes and loads from the study area during operational and closure phases
for various closure scenarios. The model was supported by detailed specialist flow and geochemical models
which simulated specific processes. The specialist models used were Vadose/W for unsaturated flow
modeling, Darcian equations for saturated flow modeling, and PHREEQC Version 2.7 for modeling of
equilibrium reactions and identification of geochemical solubility controls on seepage quality.
Appello, C.A.J. and Postma, D. (2007) Geochemistry, Groundwater and Pollution, 2nd Edition, Netherlands,
GeoSlope (2004) Vadoze/W Software, Geoslope International Ltd, Calgary, Canada, Software.
Midgley, D.C., Pitman, W.V. and Middleton, B.J. (1994) Surface Water Resources of South Africa 1990, Water
Research Commission Report, 298/2.2/9, www.wrc.org.za.
Morin, K.A. and Hutt, N.M. (1997) Environmental Geochemistry of Minesite Drainage, Canada.
Parkhurst, D.L. and Appello, A.A.J. (1999) PHREEQC geochemical modeling code (Version 2), Software.
Usher, B.H., Cruywagen, L.M., de Necker, E. and Hodgson, F.D.I. (2001) On-site and Laboratory Investigations of
Spoil in Opencast Collieries and the Development of Acid Base Accounting procedures, Water Research
Commission Report, 1055/1/03, www.wrc.org.za.