The proposed Rosemont Copper Company (Rosemont) operation will require approximately 3,800 gallons per minute (gpm) (6,132 acre-feet per year (ac-ft/yr)) of process water for mining and processing operations (Stantec Consulting, 2009) and approximately 4 gpm of potable water for showers, drinking, and toilets1. For the life of the facilities, the total requirement is estimated to be 105,000 ac-ft. The Arizona Department of Water Resources (ADWR) has granted Rosemont a Mineral Extraction and Metallurgical Processing Groundwater Withdrawal Permit (ME Permit) to withdraw 6,000 ac-ft/yr from the Santa Cruz River basin, which is located west of the Santa Rita Mountains and west of the proposed mine site. The aquifer is within the Upper Santa Cruz River sub-basin of the Tucson Active Management Area (AMA) groundwater basin (WestLand Resources, 2007).
Stone, C., M. Sieber, and J. Kline. 2011. Review of Alternative Water Sources—Revised. SRK Project Number 183101/2200. Prepared for SWCA Environmental Consultants. Tucson, Arizona: SRK Consulting, Inc. May 13.