Additional Rosemont Response to FS/BLM Comment ES-1 on Tetra Tech Groundwater Model

Rosemont Copper Company (Rosemont) received review comments on both the Montgomery & Associates (M&A) and Tetra Tech groundwater flow models in a letter titled “Groundwater Modeling for the Rosemont Copper Project Environmental Impacts Analysis”, dated April 5, 2011 (Attachment 1). This letter was the follow-up to a meeting held in February 2011 between Rosemont’s groundwater modeling consultants, the United States Forest Service (FS), the Bureau of Land Management (BLM), and their contractors.