Jabiluka mine monitoring data

Ngarradj (Swift Creek) monitoring data 2001-2009

The graphs on this web page show SSD data for the 2001-05 wet seasons and ERA and SSD data for 2006-09 wet season.

The Supervising Scientist's interpretation of the data in these charts is available at:

Explanatory notes on physical and chemical indicators of water quality

The uranium limit of 6 µg/L recommended by the Supervising Scientist has been derived using local ecotoxicological data. The limit must not be exceeded. Please note that the limit is far above the range shown on the charts, but the scale on the right hand axis shows how the measured concentrations compare to the limit.

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Graph showing uranium levels in Ngarradj Creek 2006-2009

Graph showing uranium levels in Ngarradj Creek 2001-2006

Magnesium in Ngarradj

Due to a natural source of magnesium between the upstream and downstream monitoring points in Ngarradj Creek, the Supervising Scientist has recommended a guideline value of 0.76 mg/L determined statistically and which may be extended occasionally due to natural events.

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Graph showing magnesium levels in Ngarradj Creek 2006-2009

Graph showing magnesium levels in Ngarradj Creek 2001-2006

Sulfate in Ngarradj

The sulfate guideline value of 1.5 mg/L recommended by the Supervising Scientist for Ngarradj Creek is determined statistically and may be exceeded occasionally due to natural events. The guideline should not be exceeded due to mining activities.

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Graph showing sulfate levels in Ngarradj Creek 2006-2009

Graph showing sulfate levels in Ngarradj Creek 2001-2006

pH in Ngarradj

The pH guideline value of 3.92 - 6.0 recommended by the Supervising Scientist is statistically determined. It may be exceeded occasionally due to natural events but should not be exceeded due to mining activities. pH will be interpreted with regard to the values of other key variables.

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Graph showing pH levels in Ngarradj Creek 2006-2009

Graph showing pH levels in Ngarradj Creek 2001-2006

Conductivity in Ngarradj

The conductivity guideline value of 21 µS/cm recommended by the Supervising Scientist is determined statistically and may be exceeded occasionally due to natural events. The guideline should not be exceeded due to mining activities.