MT MORGAN OPEN CUT PIT WATER QUALITY MODELLING stage 2 ● 11
2. SCOPE OF WORKS
Heritage Minerals is proposing new operations at the Mount Morgan mine site that would require a temporarily increased discharge rate during construction and dewatering of the OCP. The proposed activities include the re-processing of historic mine tailings and are expected to essentially result in the dewatering of the OCP. Ultimately, Heritage Minerals’ project would provide a means of improving the ongoing uncontrolled acid rock drainage (ARD) observed to date in the Dee River. Given the ownership of the historical, environmental and heritage legacy at the mine site will remain with the Queensland Government through DoR, it is necessary to identify the potential risks associated with Heritage Minerals’ proposed plans. Hydrobiology were commissioned by Heritage Minerals to undertake a water quality model for mixing of new tailings with OCP water and provide some guidance regarding condition W11 of EA (EPML00433013). W11: The holder of this environment authority must only undertake mining activities that result in no change to or an improvement in water quality reporting to the Mount Morgan Open Cut Pit.
The scope of works for this project was as follows:
1. Develop a quantitative geochemical model for mixing of new tailings with OCP water with 9 scenarios under two variables: Volume ratios of new tailings slurry to OCP water and pH using software ‘The Geochemist’s Workbench’.
2. Compare the model outcome with the laboratory testing results.
www.hydrobiology.com
Heritage Minerals
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