Mount Morgan Mine Upper Mundic Gully TSF EA Amendment

Contents (continued)

List of figures Figure 1.1 Mt Morgan mine site key features.................................................. 2 Figure 1.2 Overview of the MSES across the receiving environment............. 4 Figure 2.1 Overtopping and piping failure configurations (US Army Corps of Engineers, 2014)............................................................. 6 Figure 2.2 Combined flood hazard curves (Smith et al . (Smith, Davey & Cox, 2014))..................................................................... 7 Figure 3.1 Proposed breach location for Upper Mundic Gully TSF Stage 1.........................................................................................10 Figure 3.2 Proposed breach location for Upper Mundic Gully TSF Stage 2.........................................................................................10 Figure 4.1 Indicative diagram of assumed failure cone .................................13 Figure 4.2 Embankment configuration of Stage 1..........................................14 Figure 4.3 Failure cone footprint Upper Mundic Gully TSF Stage 2 ...................................................................................................15 Figure 4.4 Comparison of historical dam failure release volumes and estimated released volumes..................................................16 Figure 4.5 Stage 1 failure outflow hydrograph...............................................17 Figure 4.6 Stage 2 failure outflow hydrograph...............................................18 Figure 4.7 Comparison of historical failure peak discharge against dam height....................................................................................19 Figure 6.1 Mine personnel distribution...........................................................26 Figure 6.2 Fatality rate vs. DV for cases with little or no warning time...............................................................................................28 Figure 6.3 Aquatic and terrestrial GDEs near Upper Mundic Gully TSF...............................................................................................34

List of appendices Appendix A Flood inundation maps

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