Appendices 5-13 - Nautilus Cares - Nautilus Minerals

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Table 1: pH, redox (Eh), conductivity and dissolved oxygen of centrifuged seawater from 1:10 ore:seawater elutriation at 6 o C Sample pH Redox mv Conductivity mS/cm Dissolved oxygen % Sea water 8.39 268 48.5 65.3 0 min Blank 8.46 264 49.4 76.9 0 min Dup 1 7.81 237 49.4 76.0 0 min dup 2 7.85 215 50.4 73.6 0 min Dup 3 7.82 210 50.8 70.5 5 min 7.85 216 47.6 70.0 10 min 7.81 207 48.8 64.4 15 min 7.78 215 48.0 64.9 30 min 7.87 216 49.7 71.6 60 min Blank 8.41 212 49.1 70.9 60 min Dup 1 7.86 213 50.3 73.1 60 min Dup 2 7.79 237 47.3 67.9 60 min Dup 3 7.80 223 48.3 68.1 180 min 7.79 214 47.5 78.6 420 min 7.77 237 52.6 63.9 720 min 7.71 227 51.4 70.5 1440 min Blank 8.36 269 49.7 66.2 1440 min Dup 1 7.66 213 52.1 60.1 1440 min Dup 2 7.67 216 52.5 59.4 1440 min Dup 3 7.63 218 52.8 57.9 Sea water 8.32 270 51.7 74.7 pH showed an initial decrease at time zero of approximately 0.6 pH units. The pH did not drop below that value over the first 420 minutes. There was a drop of another 0.1 pH units at 1440 minutes. This decrease in pH is most probably due to the surface oxidation of sulfide. The oxidation of the ore is also reflected in the decrease in redox and dissolved oxygen. Conductivity remained unchanged throughout the 24 hours. 8
Table 2: pH, redox (Eh), conductivity and dissolved oxygen of centrifuged seawater from 1:10 ore:seawater 180 minute elutriation at 12 o C and 24 o C Sample pH Redox mv Conductivity mS/cm Dissolved oxygen % Sea water 8.13 223 50.1 84.9 12 C Blank 8.13 228 49.2 89.4 12C Dup 1 7.39 217 50.3 85.1 12C Dup 2 7.36 241 50.2 79.5 12C Dup 3 7.3 243 50.3 80.7 24C Blank 8.17 240 50.1 55.8 24C Dup 1 7.19 248 50.9 47.3 24C Dup 2 7.11 253 50.5 47.5 24C Dup 3 7.36 242 50.5 50.9 Sea water 8.09 268 49.9 55.4 Table 2 shows that the pH decreased further at the higher temperatures of 12 and 24 o C compared to 6 o C. Figure 1 shows the decrease in pH of the elutriates at 6, 12 and 24 o C after 180 minutes. The 6oC data is from the Phase 1 experiment, but it is the ore sample was used for both experiments and all other conditions were the same. pH decrease 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 6 Deg 12 Deg 24 Deg Temperature Figure 1: Decrease in centrifuged seawater pH from 1:10 ore:seawater 180 minute elutriation at 6 o C, 12 o C and 24 o C. Note 6 o C data from Phase 1 experiment. The decrease in pH with temperature shows the temperature dependence of the oxidation of the sulfide ore under these conditions. The Phase one experiment showed the alkalinity decreased by approximately 12% between 0 and 60 minutes compared to the control seawater which is consistent with the observed decrease in pH (Table 3). There was a further decrease in alkalinity at 9
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Page 4 and 5: Project director David Gwyther Proj
Page 7: Appendix 8 Juvenile Amphipod Whole
Page 10 and 11: 10-day Survival of M. plumulosa Pag
Page 12 and 13: Centre for Environmental Contaminan
Page 14 and 15: Centre for Environmental Contaminan
Page 17: Appendix 9 Elutriate Testing Report
Page 20 and 21: Table of Contents 1. Introduction 3
Page 22 and 23: These elutriate tests were designed
Page 24 and 25: 2. An aliquot(s) of sample after ce
Page 28 and 29: 1440 minutes which is also consiste
Page 30 and 31: Concentration (ppb) 250.0 200.0 150
Page 32 and 33: Concentration (ug/kg ore) (log scal
Page 34 and 35: Zinc sulfide is the most soluble of
Page 36 and 37: Table 5: Major ions in 0.45 !m filt
Page 38 and 39: 3.5 Comparison to ANZECC/ARMCANZ (2
Page 40: 5. References ANZECC/ARMCANZ (2000)
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Page 45 and 46: Appendix 4: Phase 1: Normalised dat
Page 47 and 48: Appendix 6: Phase 2: Quality contro
Page 49: Appendix 8: Metal concentrations in
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MODELLING THE DISPERSION AND SETTLE
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TABLE OF CONTENTS 1 EXECUTIVE SUMMA
Page 161 and 162:
2 MODELLING METHODOLOGY AND DATA 2.
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2.3 The SSFATE Model Sediment dispe
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Earth Mechanics Institute of the Co
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3 RESULTS AND DISCUSSION The calcul
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Table 3.1. Summary of areas covered
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Figure 3.3b. Sediment bottom thickn
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Figure 3.3d. Sediment bottom thickn
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4 REFERENCES Swanson J.C., Isaji T.
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MODELLING THE DISPERSION OF THE RET
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TABLE OF CONTENTS 1 EXECUTIVE SUMMA
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Given the range of tidal and basin
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dispersion is modelled using a rand
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Figure 2.1. Data from the ADCP at 6
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2.5 Outfall Configuration and Assum
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3 RESULTS AND DISCUSSION 3.1 Diluti
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Figure 3.1. Snapshot in time of a
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5.0 km at any time during the disch
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Figure 3.2. The expected (or averag
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Figure 3.4 A zoomed in comparison o
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5 REFERENCES Bear, J. and Verruijt,
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Rusin J., Lunel T. and Davies L., 1
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Prediction of underwater noise asso
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Table of Contents 1 Introduction ..
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1 Introduction This report presents
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2 Methods 2.1! Source modelling Cav
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dB re 1uPa @ 1m 200 195 190 185 180
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Figure 3. Source location for the s
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Depth (m) 0 500 1000 1500 2000 2500
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Figure 7. Plots of predicted receiv
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Figure 9. Zoomed view of plots of p
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Figure 11. Predicted maximum level
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for computing a is given in Fisher
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ecent studies have indicated that c
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sources to close range, and that th
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masking ranges for different marina
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References Fisher, F. H., Simmons,
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Appendix 14 The Potential for Natur
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'leaky' and recent lava flows have
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iii.) Incrementally these 1 m swath
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Appendix 15 Stakeholder Consultatio
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Environmental Impact Statement Solw
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Wewak (22 October 2007) Not recorde
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San Diego (17-18 April 2008) Enviro
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Appendices 5-13 - Nautilus Cares - Nautilus Minerals

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