Rosemont Mine (the Mine) and Tetra Tech provided extensive feedback to our previous review comments. One of the most important aspects that were highlighted in the response is that the Mine is planning to do post-closure maintenance. This planned activity removes the concerns we had about the geometry of the landform, sediment control design considerations, pre- and post-mining sediment yield calculations, flow-through drains, and allowance for erosion in the containment areas.
Annandale, G. 2011. Technical Memorandum: Rosemont Copper Project, Final Response on Tetra-Tech Information. Project No. 093-81962. Lakewood, CO: Golder Associates Inc. May 31.