Nabarlek Pit decommissioning migration of sulphate, nitrate and radium ions in groundwater - preliminary modelling
E-Publications; E-Books; PublicationNT; Report ; 41/1984
Made available via the Publications (Legal Deposit) Act 2004 (NT).
Dept. of Transport and Works
Report ; 41/1984
Check within Publication or with content Publisher.
Technical Report WRD84041 Viewed at 14:07:09 on 29/07/2010 Page 21 of 34. I I I I I I I I I I I I I I I I I I I I I 1. 3. 7. CONCLUSIONS Preliminary modelling suggests that the long term radium distribution around the pit after rehabilitation will be similar to that already established in groundwater as a result of leaching of the original ore body. The arrival time for radium ions at Cooper Creek will be In the order of 5 x 10 5 years after rehabilitation. Estimates of sulphate ion loads discharging into Cooper Creek neglecting dispersion are comparable with loads carried by this creek in a wet season. 1= a groundwater veloci ty of 0.03 m/ day is assumed, groundwater v1ill take approximately 90 years to reach Cooper Creek from the pit and dispersion will substantially reduce dry season ? loads of this ion. However, loading of 504- will still be comparable with some first flush loadings for this ion ~n Cooper Creek. Nltrate ion loads reaching Cooper Creek will only be comparable with first flush loads if dispersion is negligible. Dispersion of this ion in groundwater and uptake by plants are expected to substantially reduce the amount of nitrate ion that reaches Cooper Creek. SA2/11:TJ