Major South African gold-mining companies have recently turned to 3-D seismic surveys for mine planning in Witwatersrand Basin (e.g., Pretorius et al., 1997). We present examples showing that 3-D seismic data provide the gross structure and depth of the prospective stratiform ore horizons (the original objective of such surveys), and that careful analysis of 3-D seismic attributes—backed up with borehole control, direct geologic observations, and synthetic seismograms—can provide important information on small-scale faulting (throws of 10–20 m) and lithologic variations of the ore-zone conglomerates.

The Target gold project (Gray et al., 1994) is immediately north of the Welkom gold field,...

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