Tim Bayley

To assess the cumulative impact associated with use of groundwater for the Resolution Copper Project, modeling of proposed Resolution Desert Wellfield (DWF) pumping in East Salt River Valley (ESRV) was conducted in 2020 in support of an Environmental Impact Statement (EIS) using what was then ADWR’s current Phoenix AMA groundwater model. Results indicate that without Resolution DWF pumping, but including all other reasonably foreseeable future uses, pumping depths to groundwater beneath the Desert Wellfield at the end of a 100-year predictive period would be approximately 550 feet.

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

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 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 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 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).

This technical memorandum was prepared to document groundwater transport modeling and results for TSF Alternative 5—Peg Leg.

This technical memorandum was prepared to document groundwater transport modeling and results for TSF Alternative 6—Skunk Camp.

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