Kensington Gold Project Final Supplemental Environmental Impact ...

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A-21 Kensington Gold Project Final SEIS Appendix A • Maxim Technologies (2000), Comparison of Particle Size Distributions, Mineral Compositions, and Chemical Compositions between Kensington Mine Tailings and Lynn Canal Sediment. • Knight Piesold (2001), Coeur Alaska Inc. Kensington Project: Slate Creek Lakes Tailings Storage Facility Conceptual Design and Water Balance (Ref. No. 31328/12-2). • Knight Piesold (2002), Coeur Alaska Inc. Kensington Project: Slate Creek Lakes Tailings Storage Facility Report on Water Quality Modeling and Conceptual Closure Plan (Ref. No. VA101-00020/1-1). Efforts to compare and integrate data from the various testing programs raised the question of whether the ore used to generate the tailings for each set of analyses was comparable between tests. The Forest Service also reviewed whether the ore samples were representative of the overall ore body and if the chemistry of tailings generated in different metallurgical studies was consistent between tests. 1. Review of Ore Sampling and Metallurgical Studies Three bulk ore samples have been collected for metallurgical testing over the life of the Kensington project. Four sets of analyses of these samples have been completed, designated M1 through M4 in Figures 1 through 7. The first bulk sample was collected in 1994 and tested by Degerstrom (results shown as M1) to evaluate cyanidation processing. As cyanidation is no longer proposed, those data are not presented here. The second bulk ore sample was a 3.8-ton composite collected by Lakefield Research, known as Composite B. The composite B sample was composed of quartz-carbonate veins and pyritic mineralization excavated from Crosscut II, on the 1,150 elevation, in zones 10, 20, and 41. This composite generated tailings and process water samples that were analyzed first by Degerstrom in 1995 (M2) and later by Montgomery Watson and SRK (M3) in 1996 (Montgomery Watson, 1996; SRK, 1996). The specific whole rock digestion used in the M2 analysis is not known but is obviously a more complete (i.e., four-acid) digestion than the USEPA method 3051 digestion used for the M3 analyses. The gold assay, whole rock metal and sulfur geochemistry of the ore composites, and the tailings are described in Tables 4 and 7 based on the 1996 M3 analyses. The five batches of tailings that were analyzed were generated in separate batches, and process water was not recycled.
d – DRILL INTERCEPT M1 = 1991 Bulk Sample – 1150 LEVEL (Degerstrom, 1994) M2 = 1994 Bulk Sample – 1150 LEVEL (Lakefield, 1995) M3 - 1996 Bulk Sample 10,20,41 (Montgomery Watson, 1996) M4 = 1998 Bulk Sample-zones 10,20,30,41 (CMRI, 1998) Figure 1 A-22 Kensington Gold Project Final SEIS Appendix A After Coeur, 1996, Geologic Character of the Kensington Gold Deposit
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Page 28 and 29: d - DRILL INTERCEPT M1 = 1991 Bulk
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TEC threshold effect concentration
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Figure 1.1 Final Extent of TSF and
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Figure 1.3 Tailings Placement and E
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2.0 PROBLEM FORMULATION FINAL This
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FINAL LSL has a surface area of 8.1
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FINAL A wide variety of benthic mac
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2.3 Conceptual Site Model FINAL Bas
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FINAL subsequent consumption of COP
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Management Goal 3: FINAL ⇒ Protec
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FINAL This assessment endpoint was
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Table 2.2 Summary of Management Goa
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Table 3.1 Comparison of Decant Wate
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FINAL Chapman et al. (2000) reporte
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FINAL Shading of cells in Table 3.2
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FINAL The bioaccumulation potential
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4.0 RISK ANALYSIS FINAL The Risk An
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4.2 Exposure Assessment 4.2.1 Recep
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FINAL ingestion rates and water ing
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4.2.3 Bioaccumulation Factors and E
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FINAL reported NOAEL and LOAEL valu
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4.3.1.2 Operational Water Table 4.6
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FINAL While both Cr +6 and Cr +3 ar
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FINAL 10 8 gallons would be orders
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4.3.4.2 Post-Closure Conditions FIN
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Table 5.1 Summary of Risk Character
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FINAL scenario. Chromium concentrat
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FINAL forage base, primarily throug
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FINAL would have sufficient light p
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Table 5.4 Data Corresponding to Fig
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FINAL Table 5.5 Summary of Risk Cha
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FINAL contain elevated levels of ar
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FINAL It is also important to note
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FINAL volume of water present and t
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FINAL DOE-SRS (Department of Energy
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FINAL Mount, D.R., D.D. Gulley, J.R
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FINAL USFS (U.S. Forest Service). 2
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Attachment A. Dietary NOAEL and LOA
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Table B.1 Safe and Toxic Water Conc
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Table B.2 Safe and Toxic Soil and W
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FINAL Havas, M., and G.E. Likens. 1
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FINAL Tetra Tech, Inc. C-86 Decembe
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Table C.1a Bioaccumulation Factors
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Table C.2 Calculated Aluminum EPC V
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Table C.3a Bioaccumulation Factors
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REFERENCES FINAL Brooks, R.R. 1972.
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FINAL Tetra Tech, Inc. C-96 Decembe
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FINAL reported that coho salmon avo
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Table D.2 Literature Values for Sed
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Table D.2b TSS Effects on Salmonid
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Table D.2d TSS Effects on Adult Sal
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Table D.4 Matrix Table for Alevin S
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Table D.2e TSS Effects on Non-Salmo
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Table D.10 Effects of Deposited Sed
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Table D.12 Matrix Table for All Rec
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Specific Examples of Subaqueous Tai
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FINAL community in the tailings are
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FINAL Goldes, S.A. 1983. Histologic
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FINAL Schubel, J.R., A.H. Auld, and
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FINAL Tetra Tech, Inc. C-126 Decemb
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Table E.1 Calculated Doses for Each
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Appendix D Preliminary Reclamation
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D-2 Kensington Gold Project Final S
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2.1 Permanent Closure and Final Rec
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D-10 Kensington Gold Project Final
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Post-Mining Inspection Schedule D-1
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Attachment D-1 Preliminary Reclamat
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D-24
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D-28
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D-30
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Appendix E Best Management Practice
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E-2 Kensington Gold Project Final S
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Kensington Gold Project Final SEIS
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Figures: Figure 1 - General Facilit
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aware that in an emergency, only th
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is to streamline the gathering and
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operating and response procedures t
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Safety and Health Administration (O
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Coeur Alaska has established the fo
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After testing of an employee for re
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employee to ensure that the employe
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A release from either vertical or h
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2.3 Receiving Environment Risk Anal
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• Nearest dwelling, water body, w
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Rapid response caches will be secur
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4. The truck driver, vessel enginee
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Appendix - 2 Initial Spill Report F
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APPENDIX 4 MATERIAL SAFETY DATA SHE
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Unalaska Skagway Haines Sitka Nome
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Purpose and Need for Policy During
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planning goal of Modified Landscape
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Other Standard Operating Procedures
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� Regular inspection of fuel line
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Appendix F Old-Growth Habitat
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F-2 Kensington Gold Project Final S
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F-4 Kensington Gold Project Final S
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Appendix G Ground Water Quality
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,; ‘) ‘. ,/”’ “5k+9B .. 0
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\ r. \\\cc0wz3
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Table G-2. Laboratory Methods, Repo
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Table G-3. Summary of Ground Water
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TabIe G-3. Summary of Ground Water
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Appendix H Migratory Birds: Birds o
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H-2 Kensington Gold Project Final S
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H-4 Kensington Gold Project Final S
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Appendix J Biological Assessment/Bi
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CONTENTS 1. INTRODUCTION 1-1 2. PRO
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Acronyms and Abbreviations µPa mic
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Kensington Gold Project BA/BE Novem
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Background Coeur Alaska Kensington
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Figure 2 3
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Associated monitoring programs woul
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SOP #5: Vessels will operate at low
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Point and Slate Creek Cove transpor
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- reducing the amount of habitat to
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Kensington Gold Project SPILL RESPO
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EMERGENCY RESPONSE FORM - INJURY an
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Kensington Gold Project - Initial S
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Appendix 3 - Contact Information a.
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APPENDIX 5 TYPICAL SOIL EROSION AND
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Appendix K USEPA and State of Alask
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K-2 Kensington Gold Project Final S
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K-4 Kensington Gold Project Final S
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Appendix L: Draft SEIS Comments and
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Section 1 Comment Summary L-1
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Comment Summary The Forest Service
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Ten commenters who supported Altern
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Mailing Location Table L-1 Demograp
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