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|A waste management area of a copper zinc mine which is expected to be generating acid exceeding 1000 years is used as a research facility to develop a passive treatment approach to decommissioning the site. One of the processes proposed to be implemented in a lake with a one million cubic metre volume is biological polishing. To determine the expected performance of the process, model is constructed from experimental data collected in the lake. The model results and the field data represent a weak fit, but the discrepancies are useful indicators of key factors affecting the process, such as iron cycling.|