Appendices 5-13 - Nautilus Cares - Nautilus Minerals

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Table of Contents 1. Introduction 3 Objectives of this study 2. Methodology 4 2.1 Phase 1: Effect of time experimental conditions 5 2.2 Phase 2: Effect of temperature experimental conditions 5 2.3 Seawater sample preparation 5 2.4 Analytical methods 6 3. Results and Discussion 7 3.1 Characterisation of the centrifuged seawater 7 3.2 Characterisation of 0.45!m filtered seawater 11 3.3 Major cations in seawater elutriates 16 3.4 Dissolved organic carbon in seawater elutriates 16 3.5 Comparison to ANZECC/ARMCANZ (2000) water quality guidelines 20 4. Conclusions 20 5. References 22 Appendix 1: Phase 1: Metal concentrations in 0.45 !m filtered seawater from 1:10 ore: seawater elutriates at 6 o C. Note: Concentrations have been corrected for the Blanks and are therefore net concentrations for each time period. Appendix 2: Phase 1:Metal concentrations in 0.45 !m filtered seawater (N/C sw 1 and 2) for elutriation experiments and seawater blanks. Appendix 3: Phase 1:Quality control data for seawater metals analyses Appendix 4: Phase 1: Normalised data for dissolved metals released from one gram of ore (ng/g ore) into 250ml seawater Appendix 5: Phase 2: Metal concentrations in 0.45 !m filtered seawater from 1:10 ore: seawater 180 minute elutriation at 12 o C and 24 o C. Appendix 6: Phase 2: Quality control data for seawater metals analyses. Appendix 7: Phase 2: Net metals released and normalised data for dissolved metals released from one gram of ore (ng/g ore) into 250ml seawater at 12 and 24 o C Appendix 8: Metal concentrations in Nautilus ore sample used for Phase 1 and 2 experiments (Analysed by ALS) 2
1. Introduction The initial offshore phase of the Solwara 1 Project, which is located approximately 50km north of Rabaul, in the eastern extent of the Manus Basin – Bismarck Sea, New Ireland Province, Papua New Guinea, involves mining copper-, gold-, zinc- and silver-rich SMS deposits on the ocean floor at approximately 1,600m water depth. A subsea mining tool deployed from a mining support vessel will be used to mine the deposits and a riser and lift system, connected to the mining tool, will transport the ore to the surface vessel. Once on the surface vessel, the ore will be dewatered and transferred to a barge for shipping to an overseas concentrator and smelter. The processed water will be returned to the ocean approximately 25 m above the seafloor. The CSIRO (Simpson et al, 2007) reported on water and sediment characterization in the vicinity of the SMS deposits at the Solwara 1 Prospect. They also reported on the toxicity of the ore dewatering water on aquatic organisms. In conjunction with this work they conducted elutriate tests to determine the potential for release of contaminants from ore in the dewatering plumes. The results of the elutriate tests showed metal release was high for As, Cu, Mn and Zn, but relatively low for Ag, Cd, Ni and Pb. Based on these results Simpson et al (2007) concluded that dilutions greater than 1,000 times may be necessary before concentrations of these metals would be below the 95% protection levels of the ANZECC/ARMCANZ (2000) water quality guidelines. These tests were conducted at room temperature in fully oxygenated seawater and using ore/sediment that may have been oxidized as a result of the storage methods used. Coffey Natural Systems Pty Ltd engaged Charles Darwin University to carry out further elutriate tests based on the brief BE07008 (2008). The Brief was to conduct further elutriate tests for Nautilus Minerals Nugini Limited on an ore sample that would be extracted and subsequently discharged during an at sea ore de-watering process as part of the Solwara 1 project. The elutriate tests were to be conducted in three phases: • Phase 1: Effect of holding time; • Phase 2: Effect of temperature; and • Phase 3: Effect of shaking. 3
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Page 12 and 13: Centre for Environmental Contaminan
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Page 17: Appendix 9 Elutriate Testing Report
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Page 24 and 25: 2. An aliquot(s) of sample after ce
Page 26 and 27: Table 1: pH, redox (Eh), conductivi
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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)
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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