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Riverine Breach And Subsequent Decant Of An Acidic Pit Lake: Evaluating The Effects Of Riverine Flow-Through On Lake Stratification And Chemistry, Clinton Mccullough, Naresh Radhakrishnan, Mark Lund, Michelle Newport, Elmien Ballot, Digby Short
Riverine Breach And Subsequent Decant Of An Acidic Pit Lake: Evaluating The Effects Of Riverine Flow-Through On Lake Stratification And Chemistry, Clinton Mccullough, Naresh Radhakrishnan, Mark Lund, Michelle Newport, Elmien Ballot, Digby Short
Research outputs 2012
Breach and subsequent decant of an acidic brackish pit lake in the Collie Coal region in south-western Australia occurred during flooding of a pre-mining diverted eutrophic river. Inflowing fresher river water with high alkalinity and nutrient concentrations settled over more saline and acidic pit lake water. This created a halocline with better mixoliminion water quality and monimolimnion water quality typical of the pre-breach lake. Flow-through may represent the best long-term mine closure option for this and other pit lakes in the state and internationally where pit lake water quality degrades over time when excised from regional water systems.
Pit Lakes As Evaporative 'Terminal' Sinks: An Approach To Best Available Practice Mine Closure, Clinton Mccullough, Genevieve Marchant, Jorg Unseld, Michael Robinson, Benjamin O'Grady
Pit Lakes As Evaporative 'Terminal' Sinks: An Approach To Best Available Practice Mine Closure, Clinton Mccullough, Genevieve Marchant, Jorg Unseld, Michael Robinson, Benjamin O'Grady
Research outputs 2012
Pit lakes may form when open cut mining operations extend below groundwater level and then fill at cessation of mining and associated dewatering operations by ground and surface water influx. Pit lake hydrogeology may function as an evaporative “sink” when pit lake water evaporation rates exceed influx rates. Although not ideal closure, management of local surface and groundwaters contaminated by Acid and Metalliferous Drainage (AMD) through entrainment toward an evaporative terminal pit lake may provide a best-case scenario for protection of regional water resources required by typical mine closure time scales of hundreds to thousands of years. We present two …