ERC has worked Torex Gold Company and several other consultants to develop a stochastic water balance model of the El Limón Guajes Mine Complex (ELG). The site includes three open pits, a deep underground mine, several water storge ponds and a mill capable of processing 13,000 tonnes per day. ERC created a GoldSim model to evaluate the use of water throughout the mine site, including management of runoff, well pumping, and reuse at the mill site. The model also evaluates the future use of water once Torex begins mining ore from the Media Luna underground mine. The model was used for permitting of the and was calibrated with local data to provide the best estimates of potential outcomes.