Klohn Crippen Berger

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.

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.

This report summarizes the results of the geotechnical and hydrogeological site investigations undertaken in 2018 and 2019 to further the current understanding and/or confirm foundation and seepage conditions for the site.

The objective of this letter is to address WR-23 and describe and quantify (where possible) the embedded and adaptive contingencies incorporated into the Skunk Camp TSF design and to demonstrate the design robustness to the above uncertainties.

This letter report presents the results of the 2010 geotechnical testing program on scavenger and cleaner tailings. The results are also compared with the previous test programs in 2007 and 2009.

Summary of the Skunk Camp Tailings Storage Facility hypothetical 'dry' slumping extent analysis.

This report presents the plan of operations level design of a Tailings Storage Facility (TSF) at the Near West site.

Previous Site Selection Study

The objective of this plan is to support the site-wide reclamation plan (Tetra Tech 2020) by providing the strategy and design for implementing closure measures for the Skunk Camp TSF.

This letter report describes the static geochemical testing carried out on cleaner and scavenger tailing slurries. The static testing program is designed to provide data on the short term geochemical behavior of the tailings solid phase as well as an indication of the quality of associated process waters.

Skunk Camp Tailings Storage Facility (TSF) Final Environmental Impact Statement (FEIS) seepage management plan and supporting assessment for input into the regional groundwater model.