Figure 4 Map of Olympic Dam showing existing underground mine and outline of the proposed open pit in bold black, the potentiometric contours [top of the ground water surface in aquifer] (labeled by elevation, m, above sea-level) in blue, and the trace of the NE-SW Mashers Fault in yellow (the eastern-most 5 km have been truncated). Black arrows indicate the principal horizontal stress direction (Bunger et al. 2008). (modified from 'Figure 6-6', Appendix K Groundwater and Geochemistry, ODXdEIS)