Oracle Ridge Mine, Aquifer Protection Permit (APP) Amendment,
Pima County, AZ

Matrix New World Engineering (Matrix) developed a hydrogeologic conceptual model and a numerical flow and transport model to determine the Discharge Impact Area (DIA) for the tailings facility for a project for the Oracle Ridge Mine, located in the Santa Catalina Mountains north of Tucson, Arizona. The model was calibrated to historical conditions, including past geochemical changes down-gradient of the existing tailings facility. Groundwater characteristics at the facility were determined including the depth, flow rate, flow direction, quantity of flow and quality of groundwater. More >