MT MORGAN OPEN CUT PIT WATER QUALITY MODELLING stage 2 ● 28
5. CONCLUSION
The geochemical mixing model predicted an overall improvement in OCP water quality following the addition of new tailings slurry from the ReCYN plant, based on a pH of 9.6 and a 0.61:1 volume ratio (tailings to OCP water). Changes in other anion and cation concentrations were minimal. 5.1 LIMITATIONS AND RECOMMENDATION These modelling results were generated using the Geochemist’s Workbench modelling tool, relying on the best available data and several assumptions. Importantly, the modelling did not account for the potential release or absorption of metals and other elements from or into the new tailings during mixing. While the new tailings contain high total concentrations of iron and aluminium, the lack of dissolved-phase (solution fraction) data limits the precision of the predictions. To improve model accuracy, it is recommended that a complete analysis of water-soluble concentrations in the new tailings be undertaken. These inputs would allow for more robust and representative geochemical modelling.
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