Ranger mine monitoring data

Magela Creek monitoring data 2013-2014

The graphs on this web page show the following key chemical indicators for the 2013-2014 wet season plus flow rate of the creek at the compliance point gauging station (MG009). Data for physico-chemical parameters and filterable analyte concentrations from previous wet seasons can be found at Magela Creek grab sample monitoring data 2002 - 2010 and Magela Creek monitoring data 2010-13.

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

Chemical Indicators

Conductivity in Magela Creek

The conductivity limit of 42 µS/cm was ecotoxicologically derived and applies to exposures greater than 72 hours in duration. The Supervising Scientist has developed an interpretive framework for the less than 72 hour pulse exposure EC data produced by the continuous monitoring program. Details can be found on the Ecotoxicological Electrical Conductivity-Magnesium Pulse Framework page.

Magela Creek continuous monitoring data (conductivity) from the 2013-14 wet season

Magela Creek continuous monitoring data (conductivity) from the 2013-14 wet season

Turbidity in Magela Creek

The turbidity guideline of 26 NTU was determined statistically from historical weekly grab sampling data, and applies to water quality measured in grab samples. This guideline may be exceeded occasionally due to natural events but should not be exceeded due to mining activities.

Magela Creek continuous monitoring data (turbidity) from the commencement of the 2013-14 wet season.

Magela Creek continuous monitoring data (turbidity) from the commencement of the 2013-14 wet season.

pH in Magela Creek

The pH guidelines of 5.0-6.9 were determined statistically from historical weekly grab sampling data, and applies to water quality measured in grab samples. This guideline may be exceeded occasionally due to natural events but should not be exceeded due to mining activities.

Magela Creek continuous monitoring data (pH) from the commencement of the 2013-14 wet season.

Magela Creek continuous monitoring data (pH) from the commencement of the 2013-14 wet season.

Uranium in Magela Creek

The uranium limit of 6 µg/L has been derived using local ecotoxicological data in accordance with the Australian Water Quality Guidelines to protect 99% of the species present. The limit must not be exceeded. Please note that the limit is far above the range shown on the charts.

Magela Creek uranium data from the commencement of the 2013-14 wet season. Please note that the uranium Limit of 6 µg/L is off the chart.

Magela Creek uranium data from the commencement of the 2013-14 wet season. Please note that the uranium Limit of 6 µg/L is off the chart.

Manganese in Magela Creek

The manganese guideline 75 µg/L was ecotoxicologically derived and applies to creek flows greater than 5 cumecs. This guideline may be exceeded occasionally due to natural events but should not be exceeded due to mining activities.

Magela Creek manganese data from the commencement of the 2013-14 wet season.

Magela Creek manganese data from the commencement of the 2013-14 wet season.

Magnesium in Magela Creek

The magnesium limit of 3 mg/L was ecotoxicologically derived and applies to exposures greater than 72 hours in duration. The Supervising Scientist has developed an interpretive framework for the less than 72 hour pulse exposure magnesium data produced by the continuous monitoring program. Details can be found on the Ecotoxicology Electrical Conductivity-Magnesium Pulse Framework page.

Magela Creek magnesium data from the commencement of the 2013-14 wet season.

Magela Creek magnesium data from the commencement of the 2013-14 wet season.

Sulfate in Magela Creek

There is no specific guideline for sulfate in Magela Creek. EC is strongly correlated to sulfate. Therefore, the guideline for electrical conductivity is referred to when interpreting sulfate data. For comparison, the drinking water standard with taste as the criterion for sulfate is 250 mg/l.

Magela Creek sulfate data from the commencement of the 2013-14 wet season.

Magela Creek sulfate data from the commencement of the 2013-14 wet season.

Total Ammonia Nitrogen (TAN) in Magela Creek

The interim total ammonia nitrogen guideline of 0.7 mg/L was derived using international ecotoxicological data. In accordance with the Australian Water Quality Guidelines to protect 99% of the species present the Supervising Scientist is developing site specific ecotoxicologically derived trigger values using aquatic species endemic to the Alligator Rivers Region.

Magela Creek total ammonia nitrogen (TAN) data from the commencement of the 2013-14 wet season.

Magela Creek total ammonia nitrogen (TAN) data from the commencement of the 2013-14 wet season.

Radium-226 in Magela Creek

The limit for total 226Ra activity concentration has been defined for human radiological protection purposes. The medians of all 226Ra data collected over the 2011-12 wet season are calculated for both the upstream and the downstream sites. The median of the upstream data is then subtracted from the median of the downstream data. This difference value, called the ‘wet season median difference’, should not exceed 10 mBq/L.

Magela Creek radium data from 2001-02 to 2013-14 wet seasons

Magela Creek radium data from 2001-02 to 2013-14 wet seasons

The data presented below are the investigative samples collected from the upstream and downstream Magela Creek monitoring sites in the period following the Ranger leachate tank failure incident and routine radium composite sample results from January and February 2014.