Montgomery & Associates

This technical memorandum was prepared in response to Groundwater Work Group Action Item WR-12 “Pull well records and other information for QV and model the impacts” to provide information to address Draft Environmental Impact Statement (DEIS) comments about potential impacts to Queen Valley, Arizona water supplies from proposed Resolution Copper mining activities.

Evaluation of potential 100-year drawdown impacts from groundwater pumping to supply the proposed RC mine.

This document proposes an approach to monitoring and mitigation of Groundwater Dependent Ecosystems (GDEs) identified through the NEPA process as being dependent on project area regional groundwater and therefore at risk of being impacted by mine dewatering activities.

This technical memorandum was prepared to document preliminary results of fate and transport modeling using additional seepage controls to reduce seepage rates developed for Resolution Copper (RC) tailings storage facility (TSF) alternatives.

This memorandum was written for the United States Forest Service (USFS) to document construction and results of steady-state groundwater flow modeling (Model) representing the additional engineered seepage control measures for the proposed Near West Tailings Storage Facility (TSF) designs (Alternative 2 and Alternative 3).

This technical memorandum was prepared to document a preliminary analysis of allowable seepage from the tailings storage facility (TSF) alternatives currently being considered by Resolution Copper (RC).

This technical memorandum has been issued to correct for tailings seepage rates that were recently modified in the steady-state models for tailing storage facility (TSF) Alternatives 2 and 3 (M&A 2018) per the direction of the United States Forest Service and the groundwater working group.

This memorandum was written to document model construction and results of steady-state groundwater flow modeling (Model) of the proposed Near West Tailings Storage Facility (TSF).

Email from Todd Keay, Montgomery Associates, describing historical mine dewatering operations.

This technical memorandum was prepared to document groundwater transport modeling and results for TSF Alternative 4—Silver King Filtered.