At your request, MWH Americas, Inc. (MWH) has reviewed the input and output (I/O) files prepared by Montgomery and Associates (M&A) for the simulations of Rosemont Copper’s mine supply pumping. The scope of the review was to perform an audit of the consistency of the I/O files with what M&A has reported in the following documents:
- Groundwater Flow Modeling Conducted for Simulation of Rosemont Copper’s Proposed Mine Supply Pumping (M&A, April 30, 2009)
- Second Update to ADWR Modeling in Sahuarita/Green Valley Area (M&A, April 27, 2009)
- Addendum to Groundwater Flow Modeling Conducted for Simulation of Rosemont Copper’s Proposed Mine Supply Pumping (M&A, November 11, 2010)
- Additional Discussion of Rosemont Mine Supply Pumping and Analysis of Calibration (M&A, January 6, 2011)
The audit was specific to the verification of the consistency between the modeling files and the documentation referenced above, and it did not evaluate the assumptions and methods used in the model construction. MWH has previously reviewed the methods and assumptions for the model construction, calibration, and simulations. This review is documented in technical memorandums addressed to SWCA Environmental Consultants (SWCA) and dated October 23, 2009; August 9, 2010; and January 18, 2011.