Kensington Gold Project Final Supplemental Environmental Impact ...

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Table 8. Total Whole Rock Metal and Sulfur Geochemistry, M4 Sample M4 CMRI (1998) Settling time estimated 30 minutes A-37 Kensington Gold Project Final SEIS Appendix A CMRI 1998 CMRI C2 CMRI C3 CMRI C4 CMRI C5 (detection CMRI D2 Leach Decant Leach Decant Leach Decant Leach Decant Kensington Mine Parameter limit) DUPLICATES C2 Water Water Water Water Water 1998 Met. lab name CMRI CMRI CMRI CMRI CMRI CMRI Anal. lab name MW/BNL MW/BNL MW/BNL MW/BNL MW/BNL MW/BNL MW/BNL Process recycle recycle recycle recycle recycle Date test 1998 1998 1998 1998 1998 9/18/1998 No. samples 1 1 1 1 1 1 Composite 3.7 ton 3.7 ton 3.7 ton 3.7 ton 3.7 ton grab Aluminum (µg/L) 500 2,700 2,800 3,900 250 1,100 3,200 Arsenic (µg/L) 0.02
A-38 Kensington Gold Project Final SEIS Appendix A Table 8. Total Whole Rock Metal and Sulfur Geochemistry, M4 Sample (continued) M4 CMRI (1998) Settling time estimated 30 minutes CMRI 1998 CMRI C2 CMRI C3 CMRI C4 CMRI C5 (detection CMRI D2 Leach Decant Leach Decant Leach Decant Leach Decant Kensington Mine Parameter limit) DUPLICATES C2 Water Water Water Water Water 1998 WHOLE ROCK TAILS DATA Rescan, 2000 Rescan, 2000 Rescan, 2000 Rescan, 2000 Rescan, 2000 Tails digestion 4 acid 4 acid 4 acid 4 acid 4 acid Tails tot S, % 0.06 0.06 0.06 0.06 0.06 Tails Cu, ppm 27 27 27 27 27 Tails Fe, ppm 31,600 31,600 31,600 31,600 31,600 Tails Pb, ppm 6 6 6 6 6 Tails, Hg ppb 10 10 10 10 10 Tails Mn, ppm 14,000 14,000 14,000 14,000 14,000 Tails Ni, ppm 32 32 32 32 32 Tails Zn, ppm 54 54 54 54 54 Grade measured for each batch by CMRI; whole rock geochemistry for bulk composite low-level metal analyses are not available for adit water. 2. Tailings Flotation and Process/Decant Water Sampling Both sets of flotation tests were conducted using the same metallurgical process, with differences in the recycling of process water and pH adjustment through lime addition. In the 1996 Montgomery Watson tests, two process water chemistry measurements were made for each batch, after 16 hours and 24 hours of settling time. The five analyses of process decant water collected after 24 hours (MW96 C1–C5 24 hr) are summarized in Table 4 for dissolved concentrations and Table 7 for total concentrations. In the 1998 CMRI/Montgomery Watson work, the process (or decant) water was analyzed for the last four of the five cycles (CMRI C2–C5), for both dissolved and total concentrations (Tables 5 and 8). Unlike the results of the initial 1996 process water testing, concentration of solutes increased with each cycle due to the use of recycling in 1998. Water collected from the Kensington Mine workings for use in the flotation process was also analyzed, as shown in Tables 5, 6, and 8. The 1998 test process was somewhat modified by the use of additional lime to achieve higher pH, as a basis for improving recovery. This resulted in higher hardness concentrations. As pH will be adjusted to optimize recovery and maintain minimum ore grades in concentrates shipped to smelter during mine life, hardness should be expected to vary between 200 and 600 mg/L. For this reason, data generated through analysis of M2 and M3 tailings are both relevant for the TSF evaluation. Process or decant water samples were collected after tailings were allowed to settle. Unlike the 1996 Montgomery Watson data, which specifically collected decant water following 16 and 24 hours of settling time, no information on the time allowed for precipitation of solids prior to sampling was provided for the 1998 CMRI samples. Decant water was removed by pumping down to 1 inch above the tailings solid after 30 minutes of settling, but it is unclear when decant water samples were actually collected from this initial split. Comparison of the total suspended solids data, which are higher for the majority of the 1998 samples, suggests that decant water samples were collected by CMRI before full settling occurred. If samples were collected in less than 100 minutes, CMRI data indicate that settling would be incomplete. Total analyses of 1998 samples are therefore somewhat conservative, in that they reflect high concentrations of suspended solids that will not be permitted to occur in discharge. As with the predicted variance
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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-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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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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I-1
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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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Section 2 Agency and Tribal Organiz
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