Responses to Comments Provided in SWCA Memorandum of Feb 17th, 2012, Request for Professional Opinion of Specific Groundwater Modeling Concerns

SRK reviewed Montgomery & Associates (M&A) and Tetra Tech (TT) groundwater modeling Technical Memoranda and draft and final reports, met at various times with the M&A modeling staff, and provided recommendations to M&A and TT on (1) geologic and hydrogeologic characterization, as such conditions are presently understood to exist at the Rosemont mine site and surrounding areas; (2) model conceptualization; and (3) model development. The reviews, meetings, and rendering of expert opinions and technical recommendations were undertaken at the request of the Coronado National Forest in accordance with specific Scopes of Work issued to SRK over a period of approximately 3 years.