Mount Morgan Mine Upper Mundic Gully TSF EA Amendment

Contents (continued)

List of tables Table 1.1 Summary of the proposed TSF characteristics.............................. 2 Table 2.1 Vulnerability thresholds classification limits of flood hazard curves (Smith, Davey & Cox, 2014)...................................8 Table 3.1 Summary of failure mechanisms assessed................................... 9 Table 3.2 Summary of considered failure scenarios.....................................11 Table 4.1 Historical failure slopes.................................................................12 Table 4.2 Estimated outflow failure discharge for Upper Mundic Gully TSF.....................................................................................15 Table 4.3 Upper Mundic Gully TSF breach parameters...............................16 Table 4.4 Upper Mundic Gully TSF breach hydrographs .............................17 Table 6.1 Consequence Category criteria based on PAR (ANCOLD, 2012)..........................................................................22 Table 6.2 Consequence Category criteria based on PLL (ANCOLD, 2012)..........................................................................23 Table 6.3 Consequence Category criteria DETSI manual.........................23 Table 6.4 PAR estimates (ANCOLD)...........................................................27 Table 6.5 PAR estimates (DETSI)................................................................27 Table 6.6 PLL estimates according to ANCOLD..........................................28 Table 6.7 PLL estimates according to DETSI...............................................29 Table 6.8 Consequence Category Assessment for Upper Mundic Gully TSF.....................................................................................30 Table 6.9 Consequence Category assessment for Upper Mundic Gully TSF DETSI (Dam Break scenario)...................................30 Table 6.10 Consequence Category Assessment for Upper Mundic Gully TSF ANCOLD (environmental spill)...................................32 Table 6.11 Consequence Category Assessment for Upper Mundic Gully TSF DETSI (failure to contain overtopping)....................32 Table 6.12 Consequence Category Assessment for Upper Mundic Gully TSF DETSI (failure to contain seepage).........................34 Table 7.1 Summary results of consequence category assessment..............36

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