Update of Rosemont ABA Testing

Document ID: geochemical-solutions-aba-testing update-20120709

Acid-Base Accounting (ABA) testing for the Rosemont Copper project was initiated in 2006 and a summary report prepared in 2007 (Tetra Tech, 2007). For that report, 165 waste rock samples were obtained and submitted for ABA analysis (Sobek, et al.,1978). Since the preparation of Tetra Tech (2007) additional samples of Rosemont Copper waste rock have been submitted for ABA analysis. The purpose of the present memo is to provide an update of summary ABA results.