Memorandum: Slope Angle for the Planned Rosemont Open-Pit Mine South Wall Tertiary Gravel Slope

This memorandum presents an update to slope angle recommendations for the Tertiary gravels in the south wall of the planned Rosemont open-pit mine (Figure 1) that incorporates a revision to the geologic interpretation, recent hydrogeologic data, a revised pit design, and CNI’s re-interpretation of the rock-mass strength.