Klohn Crippen Berger

Summary of tailings storage facility (TSF) alternatives seepage control levels (description, schematics and estimated seepage rates) and general comparison to estimated seepage rates for other existing typical TSFs in the region.

The seepage estimate appendix (Appendix IV from the Alternative 6 - Skunk Camp DEIS design report) has been amended with the results of the additional seepage control levels and is attached to this letter.

This letter provides the potential range of uncaptured seepage with discussion on uncertainties for the Alternative 4 Silver King Filtered TSF.

During a December 2018 meeting, it was agreed by the participants that a catastrophic failure of any of the alternatives would have unacceptable consequences due to the potential for impacts to life, environment and property.

A number of tailings storage facility (TSF) designs are currently being assessed and will be included in the draft EIS (DEIS). This report presents Alternative 8 - Skunk Camp.

A number of tailings storage facility (TSF) designs are currently being assessed and will be included in the draft EIS (DEIS). This report presents Alternative 6 - Skunk Camp.

A number of tailings storage facility (TSF) designs are currently being assessed and will be included in the draft EIS (DEIS). This report presents Alternative 4 - Silver King Filtered.

A number of tailings storage facility (TSF) designs are currently being assessed and will be included in the draft EIS (DEIS). This report presents Alternative 3B - Near West Modified Proposed Action.

A number of tailings storage facility (TSF) designs are currently being assessed and will be included in the draft EIS (DEIS). This report presents Alternative 3A - Near West Modified Proposed Action.

This report presents available ground investigation data for the proposed Near West Tailings Storage Facility (TSF) site in Pinal County, Arizona, and has been prepared for Resolution Copper Mining (RCM) as part of the baseline geotechnical characterization to support the Environmental Impact Statement (EIS).

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The final EIS and draft Record of Decision (ROD) presently are scheduled to be published in the Federal Register sometime in winter 2020.

Visit Resolution Copper Timeline for more information.

Media & General Info

Point of Contact
John Scaggs
Tonto National Forest
john.scaggs@usda.gov

Apache Leap Special Management Area
Apache Leap SMA website