The Honeymoon Uranium Project in South Australia will use an acid in-situ leach (ISL) mining technique to recover uranium from mineralised sand aquifers in Tertiary paleochannels. The geochemical modeling code REACT has been used to study wastewater arising from the uranium leaching and extraction plant operations. The preferred disposal option for the wastewater is re-injection into local aquifers. Mixing reactions involving this wastewater and natural groundwater have been examined with the model to estimate the potential for adverse mineral precipitation and environmental problems. Total mineral precipitation is estimated to be less than 4X10~(-2)g/L, based on a groundwater:wastewater mixing ratio of 10:1. Due to the saline nature of the groundwaters in the region (ionic strengths range up to 0.4), the modeling has compared the Pit-zer and Debye-Hueckel equations for calculating activity coefficients. Comparable results were obtained from both techniques. These results lend support to the preferred disposal technique.
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