5.3. Processing 39 5.4. Previous rehabilitation 40 5.5. Current site condition 43 6. Rum Jungle baseline studies 48 6.1. Background to the baseline studies 48 6.2. Radiological studies 48 6.3. Contaminated site soil assessment 51 6.4. Geochemical characterisation of waste 54 6.5. Rainfall–runoff modelling 59 6.6. Main and Intermediate open pit limnology 67 6.7. Hydrogeology 73 6.8. Cover design 75 6.9. Mine trial 77 6.10. Environmental values 78 6.11. Flora and fauna 81 6.12. Data and information deficiencies and knowledge gaps 83 6.13. Knowledge management 84 7. Rehabilitation scenarios 88 7.1. Overview of options for the Conceptual Rehabilitation Plan 88 7.2. Scenario 1—Re-cover waste rock dumps in situ 90 7.3. Scenario 2—Backfill the Intermediate and Main pits then consolidate remaining waste rock into the Main waste rock dump 92 7.4. Scenario 3—Backfill Intermediate and Main pits and consolidate remaining trial rock into Dysons waste rock dump 95 7.5. Scenario 4—Backfill the Main and Intermediate pits and consolidate waste rock in former tailings dam area 98 7.6. Scenario 5—Backfill the Main pit and leave the Intermediate pit as a lake 101 7.7. Multiple Accounts Analysis results and preferred rehabilitation scenario 104 7.8. Context and limitations of the preferred rehabilitation scenario 108 7.9. Ongoing site management and maintenance requirements 109
5.3. Processing 39 5.4. Previous rehabilitation 40 5.5. Current site condition 43 6. Rum Jungle baseline studies 48 6.1. Background to the baseline studies 48 6.2. Radiological studies 48 6.3. Contaminated site soil assessment 51 6.4. Geochemical characterisation of waste 54 6.5. Rainfall–runoff modelling 59 6.6. Main and Intermediate open pit limnology 67 6.7. Hydrogeology 73 6.8. Cover design 75 6.9. Mine 77 6.10. Environmental values 78 6.11. Flora and fauna 81 6.12. Data and information deficiencies and knowledge gaps 83 6.13. Knowledge management 84 7. Rehabilitation scenarios 88 7.1. Overview of options for the Conceptual Rehabilitation Plan 88 7.2. Scenario 1—Re-cover waste rock dumps in situ 90 7.3. Scenario 2—Backfill the Intermediate and Main pits then consolidate remaining waste rock into the Main waste rock dump 92 7.4. Scenario 3—Backfill Intermediate and Main pits and consolidate remaining rock into Dysons waste rock dump 95 7.5. Scenario 4—Backfill the Main and Intermediate pits and consolidate waste rock in former tailings dam area 98 7.6. Scenario 5—Backfill the Main pit and leave the Intermediate pit as a lake 101 7.7. Multiple Accounts Analysis results and preferred rehabilitation scenario 104 7.8. Context and limitations of the preferred rehabilitation scenario 108 7.9. Ongoing site management and maintenance requirements 109 trial trial
Rum_Jungle_Conceptual_Rehabilitation_Plan-a.docx