Resolution Copper Project and Land Exchange Environmental Impact Statement

BGC Engineering

Review of Skunk Camp TSF Reclamation Plan

The purpose of this memorandum is to summarize the available information supporting this approach, some considerations in managing pyrite tailings, the available guidance and best practice, other examples of subaqueous tailings disposal, and to generally comment on the applicability for this Project.

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Subaqueous Disposal of Pyrite Tailings

The objectives of this memorandum are to summarize the information provided by RCM and reviewed by BGC and the Workgroup, describe key considerations, as well as available guidance and best practice in the industry for subaqueous disposal of reactive tailings, comment on the applicability of subaqueous disposal in an arid environment.

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Review of Numerical Groundwater Model Construction and Approach (Mining and Subsidence Area)

This report summarizes the Groundwater Modeling Workgroup evaluation of the model construction and approach for the groundwater model used to evaluate future groundwater conditions at and surrounding the proposed Resolution Copper panel cave mine.

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Geologic Data and Subsidence Modeling Evaluation Report

A Geology and Subsidence Workgroup (Workgroup) was convened as part of the Resolution Copper Project Environmental Impact Statement (EIS) team. The purpose of the Workgroup was to review Resolution Copper Mining’s (RCM) procedures, data, and geologic and geotechnical baseline documents.

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Subsidence Uncertainties at the Proposed Resolution Panel Cave, Response to Malach Consulting LLC

This memorandum is intended to provide BGC’s third party evaluation and expert opinion on each of the issues raised by Malach, through a review of Malach’s report and cited references and based on data and reports from RCM and their consultants, and discussions within the Workgroup.

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Skunk Camp Model Review

The scope of this memo includes a critical evaluation of the setup, calibration, application and predictions of the M&A (2020a) Skunk Camp TSF groundwater flow and transport model, including the related inputs from the KCB (2020) seepage model.

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Review of Desert Wellfield Subsidence Analysis

Background information on subsidence in Arizona, followed by a summary of the potential volumes of water to be withdrawn by Resolution Copper at the Desert Wellfield and current and historic water levels at the Desert Wellfield. Potential subsidence is estimated from the proposed water withdrawal based on observed subsidence in the Hawk Rock Area, which is located northwest of the Desert Wellfield.

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Review of ADWR Salt River Valley Groundwater Model Application for Resolution's Desert Wellfield - Final

This technical memorandum summarizes and evaluates Montgomery & Associates’ (M&A’s) use of the ADWR Salt River Valley model for pumping from the Desert Wellfield.

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Evaluation of Skunk Camp Site - Specific Seismic Hazard Analyses

This memorandum provides a summary of relevant state regulations and guidelines for assessing seismic hazard and estimating design ground motions as well as a summary assessment and any review comments pertaining to the objectives listed above.

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