Territory Stories

Assessment of the Jabiluka Project : report of the Supervising Scientist to the World Heritage Committee

Details:

Title

Assessment of the Jabiluka Project : report of the Supervising Scientist to the World Heritage Committee

Creator

Johnston, A.; Prendergast, J. B.; Bridgewater, Peter

Collection

E-Publications; E-Books; PublicationNT; Supervising Scientist Report; 138

Date

1999

Location

Alligator Rivers Region

Table of contents

Main report--Appendix 2 of the Main Report. Submission to the Mission of the World Heritage Committee by some Australian Scientists ... --Attachment A. Johnston A. and Needham S. 1999. Protection of the environment near the Ranger uranium mine--Attachment B. Bureau of Meteorology 1999. Hydrometeorological analysis relevant to Jabiluka--Attachment C. Jones, R.N., Hennessy, K.J. and Abbs, D.J. 1999. Climate change analysis relevant to Jabiluka--Attachment D. Chiew, F and Wang, Q.J. 1999. Hydrological anaysis relevant to surface water storage at Jabiluka--Attachment E. Kalf, F. and Dudgeon, C. 1999. Analysis of long term groundwater dispersal of contaminants from proposed Jabiluka mine tailings repositories--Appendix 2 of Attachment E. Simulation of leaching on non-reactive and radionuclide contaminants from proposed Jabiluka silo banks.

Language

English

Subject

Uranium mill tailings - Environmental aspects - Northern Territory - Alligator Rivers Region; Environmental impact analysis - Northern Territory - Jabiluka; Uranium mines and mining - Environmental aspects - Northern Territory - Jabiluka; Jabiluka - Environmental aspects

Publisher name

Environment Australia

Place of publication

Canberra (A.C.T.)

Series

Supervising Scientist Report; 138

Format

1 volume (various pagings) : illustrations, maps

File type

application/pdf

ISBN

642243417

Use

Copyright

Copyright owner

Environment Australia

License

https://www.legislation.gov.au/Details/C2019C00042

Parent handle

https://hdl.handle.net/10070/264982

Citation address

https://hdl.handle.net/10070/462402

Related items

https://hdl.handle.net/10070/462403; https://hdl.handle.net/10070/462400; https://hdl.handle.net/10070/462405; https://hdl.handle.net/10070/462406; https://hdl.handle.net/10070/462408; https://hdl.handle.net/10070/462409; https://hdl.handle.net/10070/462411

Page content

84 between the runs, 255 random selections were used subsequently for simplicity. The parameters varied for the Monte Carlo calculations were the dispersivity, aquifer porosity, Darcy velocity and retardation. The range used for each parameter is listed in table 6.3.2. Table 6.3.2 Parameter ranges used in the Monte Carlo analysis Parameter Range Longitudinal Dispersivity L 1 m to 10 m Transverse Dispersivity T 0.1 m to 1m Vertical Dispersivity V 0.01 to 0.1 m Darcy Velocity vD 5 x 10 -5 m/day to 5 x 10-6 m/day (East) 5 x 10-4 m/day to 5 x 10-5 m/day (West) Effective Porosity Pa 0.005 to 0.10 In the lower permeability aquifer to the east of Jabiluka, the concentrations of non-reactive solutes reduce to negligible levels 200 m from the mine. For example, the median sulphate concentration profile relative to the source concentration immediately downstream from the silos is given in figure 6.3.5. This solute profile was obtained for a 200 year run with a tailings permeability of 10-9m/s and an aquifer conductivity of 0.01 m/d. If the tailings concentration of sulphate, which is the most mobile of the solutes considered, is 20,000 mg/L (table 6.3.1), the three-dimensional solute transport model shows that the concentration reduces to 2000 mg/L immediately downstream of the silo (Kalf & Dudgeon 1999). The data in figure 6.3.5 show that the median sulphate concentration reduces to 20 mg/L at a distance 100 m downstream. Given the large additional dilutions through the surficial aquifer before the contaminant can reach Swift Creek, then additional dilution in the creek itself, Kalf and Dudgeon (1999) conclude that there is negligible potential for contamination of surface streams to the east. Figure 6.3.5 Variation of the median concentrations of SO4, U and Ra with distance east of the tailings silos at Jabiluka. Concentrations are expressed as ratios to the source concentration immediately downstream of the silos. The SO4 concentrations were calculated 200 years after placement. The U and Ra concentrations were calculated 1000 years after placement. Distance from Tailings Repository (m) 0 50 100 150 C on ce nt ra tio n R el at iv e to S ou rc e 0.0 0.2 0.4 0.6 0.8 1.0 SO4 200 years U 1000 years Ra 1000 years


Aboriginal and Torres Strait Islander people are advised that this website may contain the names, voices and images of people who have died, as well as other culturally sensitive content. Please be aware that some collection items may use outdated phrases or words which reflect the attitude of the creator at the time, and are now considered offensive.

We use temporary cookies on this site to provide functionality.
By continuing to use this site without changing your settings, you consent to our use of cookies.