Jabiluka Mill Alternative
5.0 Conclusion
This assessment has found that the JMA (amended layout) has significant environmental advantages over the JMA (original concept). The proposal is considered the most environmentally acceptable option for the development of an on-site milling operation subject to resolution of the following two issues.
There are concerns about the chemical stability of the cemented paste tailings and the formation of leachates that could contaminate groundwater. Further investigations are required to establish the suitability of this technology for the treatment and disposal of uranium tailings.
Another concern is the location of the tailings pits in an area where there appear to be fractured and weathered zones associated with the groundwater aquifer. There is the potential that leachates from the tailings can contaminate the groundwater aquifer and in the longer term, Swift Creek. Further investigations are required to establish the suitability of the proposed location for the tailings pits and whether grouting can overcome any leachate problems.
The proponent should further investigate these matters and demonstrate to the supervising authority that the cemented paste technology and location of the tailings pits constitutes Best Practicable Technology for the management of uranium tailings and potential leachate.
This assessment also notes that should the RMA option become viable through the agreement of the Traditional Owners, the RMA is considered overall to have the least environmental impact and be the environmentally preferred option for development of the Jabiluka mine.
