Appendices 5-13 - Nautilus Cares - Nautilus Minerals

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Zinc sulfide is the most soluble of all these metal sulfides and therefore will undergo exchange reactions with all these metals to enhance Zn mobilization (Batterham, 1999; Tsang and Parry, 2004 and references therein). 3.3 Major cations in seawater elutriates Dissolved Na, K and Mg concentrations remained unchanged from background seawater concentrations throughout the 1,440 minutes of the Phase 1 experiment and the Phase 2 temperature experiments (Tables 5 and 6, respectively). In the time course experiment of Phase1 calcium concentration showed an initial rapid increase in concentration of approximately 60%, paralleling the rapid initial metal release (Table 5). Figure 7 shows an increase in dissolution with increasing temperature which corresponds to the trend of decreasing pH with increasing temperature (Figure 1). This would suggest the presence of a readily soluble Ca mineral phase in the ore (no mineralogy was available for this ore sample). net Ca concentration (mg/L) 350 300 250 200 150 100 50 0 6 Deg 12 Deg 24 Deg Temperature (Deg C) Figure 7: Net Ca concentration in filtered seawater from 180 minute elutriation at 6, 12 and 24 o C. (Note: 6 o C data from Phase 1 experiment). 3.4 Dissolved organic carbon in seawater elutriates Dissolved organic carbon in Phase 1 experiment showed an initial increase in concentration of approximately 30% compared to the blank seawater (Table 3). The organic carbon may act as a ligand to complex some of the dissolved metals, 16
depending on the actual chemical form of the organic carbon. Organic ligands may also promote dissolution via surface complexation of metals such as Cu and Pb (Batterham, 1999). These organic complexes, if relatively inert, would reduce the bioavailability of the dissolved metals. The dissolved metal concentrations reported in this study would include organic complexes. Dissolved organic carbon is not yet available for the Phase 2 experiment as there was an instrument failure. 17
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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 26 and 27: Table 1: pH, redox (Eh), conductivi
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 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)
Page 43 and 44: Appendix 2: Phase 1: Metal concentr
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
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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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