Rosemont Geochemical Sample Composite Method

This technical memorandum summarizes the method used to composite samples tested for the Rosemont Copper Project geochemical characterization work. Over 200 composite samples of drill core course rejects, representing waste rock material, was tested in conjunction with the Phase 1 and Phase 2 geochemical testing programs. Testing results are summarized in the Baseline Geochemical Characterization (Tetra Tech, 2007a) and the Geochemical Characterization, Addendum 1 (Tetra Tech, 2007b) reports.