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For over a century, gold exploration and extraction has been a continuous activity on the Witwatersrand.
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periods. Meteorological data and source parameters, such as grain size distribution of tailings, combined
with spatial and temporal changes observed, served as input for a dispersion model. Simulated ground level
concentrations of dust, changes observed in tailings surface area, height, residential area and exposed
population for the time series are reported. These results are important for risk assessment and landscape
planning, since tailings are subject to reworking and important for planned new mining within the Gauteng
mega-city region (Witwatersrand). Overall, the outcome of this study provides insight into the nature of the
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