The updated groundwater model was used to predict dewatering rates and drawdown for the 20-year mining period. Starting with conditions at the end of mining, the model was used to predict groundwater level recovery for two scenarios. The first scenario was allowing a pit lake to develop within the pit. The second scenario is to consider conditions if the pit is backfilled with waste rock so that no pit lake will form. Predictions made with the updated groundwater model are then compared with the predictions made by M&A (2009a).
Myers, T. 2010b. Technical Memorandum: Updated Groundwater Modeling Report Proposed Rosemont Open Pit Mining Project. Prepared for Pima County and Pima County Regional Flood Control District. Reno, Nevada. April 21.