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Water Quality, Water Management and the Ranger Uranium Project: Guidelines, Trends and Issues

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Abstract

This paper explores the regulation of water quality protection downstream from the Ranger Uranium Project in the Alligator Rivers Region, an area of high conservation value which is both World Heritage- and Ramsar-listed. Available historical monitoring data for surface water quality in Magela Creek downstream of Ranger have been compiled and analysed with respect to hydrologic data and the Australian and New Zealand Environment and Conservation Council–Agricultural and Resource Management Council of Australia and New Zealand (ANZECC–ARMCANZ) regulatory guidelines, introduced in late 2000. The paper focuses on the underlying scientific basis for the current approach and examines the complex inter-relationships of minesite water management, hydrology, climate, monitoring design, implementation and interpretation which are used to differentiate between natural variability and potential mine-derived solutes. The research found that the application of the ANZECC–ARMCANZ guidelines has clearly improved the regulation of water quality protection downstream from the Ranger Uranium Project. The scientific basis is more coherent than the previous regulatory regime; however, for U (a key parameter of indigenous Mirarr-Gundjeihmi and public concern), higher downstream concentrations are permitted than those observed through natural variability, leaving open the potential for an influence of mine-derived U loads while still being within regulatory limits. Another improvement that could be made to the current regulatory regime, to provide enhanced protection of the water quality in Magela Creek downstream of Ranger, would be to explicitly link the water quality monitoring regime with hydrologic flow conditions. The paper makes a valuable case study for the application of water quality guidelines, especially for controversial projects such as uranium mining surrounded by a World Heritage- and Ramsar-listed region on indigenous land—a context of clear relevance for many places around the world.

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Acknowledgements

This work has been undertaken independently and represents the views of the authors only. The water quality data were provided by Energy Resources of Australia Ltd and Magela Creek flow data and water quality data by the Office of the Supervising Scientist. Minor additional support was provided by Gundjeihmi Aboriginal Corporation (in-kind only). Reviews of the paper by individuals from within these organisations, other colleagues and the peer reviewers have helped to strengthen the work considerably. It is all very much appreciated.

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Correspondence to Gavin M. Mudd.

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Ferguson, B., Mudd, G.M. Water Quality, Water Management and the Ranger Uranium Project: Guidelines, Trends and Issues. Water Air Soil Pollut 217, 347–363 (2011). https://doi.org/10.1007/s11270-010-0592-9

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