3.2. Alternatives to the Amendments ............................................................................................... 62
3.2.1. Amendment #1 .......................................................................................................................... 62
3.2.2. Amendment #2 .......................................................................................................................... 63
3.2.3. Amendment #3 .......................................................................................................................... 63
3.3. Standard Criteria Assessment .................................................................................................. 63
4. Upper Mundic Gully TSF Description........................................................................................ 66
4.1. Upper Mundic Gully Location and Catchment Description ....................................................... 66
4.2. Topography and Drainage ........................................................................................................ 71
4.3. Proposed TSF ........................................................................................................................... 76
4.3.1. Basis of Design ......................................................................................................................... 81
4.3.2. Dam Break and Consequence Category Assessment ............................................................. 82
4.3.2.1. Failure mechanisms ................................................................................................................. 83
4.3.2.2. Consequence Category Assessment ....................................................................................... 83
4.3.2.2.1.
ANCOLD Guidelines ......................................................................................................... 83
4.3.2.2.2.
DETSI Guidelines .............................................................................................................. 84
4.3.2.2.3.
Dam Break Consequence Results .................................................................................... 84
4.3.2.2.4.
Consequence Classification ANCOLD.............................................................................. 85
4.3.2.2.5.
Consequence Classification DETSI .................................................................................. 85
4.3.2.2.6.
Environmental Spill/Failure to contain (Overtopping Consequence) ................................ 86
4.3.2.2.7.
Environmental Spill/Failure to contain (Overtopping Consequence) - ANCOLD..............87
4.3.2.2.8.
Environmental Spill/Failure to contain (Overtopping Consequence) – DETSI .................87
4.3.2.2.9.
Failure to contain (Seepage) – Consequence .................................................................. 88
4.3.3. Tailings and Water Management .............................................................................................. 89
4.3.4. Water Balance ........................................................................................................................... 89
4.3.5. Deposition Volumes .................................................................................................................. 94
4.3.6. Decant Pond.............................................................................................................................. 96
4.3.7. Seepage and Tunnel Management........................................................................................... 96
4.3.8. Flood Potential .......................................................................................................................... 97
4.3.9. Clean Water Diversion ............................................................................................................ 100
4.3.10. Potential impacts of future deposition expansion.................................................................... 100
4.3.11. Process Plant Flow Sheet ....................................................................................................... 101
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Wulguru Technical Services Pty Ltd – Supporting Information Report
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