Appendices 5-13 - Nautilus Cares - Nautilus Minerals

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These elutriate tests were designed to test a range of conditions to which the extracted metallurgical material may be exposed. On review of the data from Phases 1 and 2 Coffey Natural Systems advised Charles Darwin University that Phase 3 would not be required at this stage. This report provides the results of Phases 1 and 2. 1.1 The objectives of this study: • To test the effect of time and temperature on the degree to which contaminants are released to the water column from the ore dewatering process • To determine the chemical composition of the contaminants released. • To make recommendations regarding treatment of the ‘process’ water. It was agreed in discussions with Coffey Natural Systems Pty Ltd that the original third objective: To determine the toxicity of the mined material and impact on benthic organisms, would not be included in this current study. Phase 1 was to investigate the effect that the holding time onboard the vessel may have on the material, particularly with regards to contaminant release Phase 2 was an investigation of the effect of temperature. The material will be mined at approximately 1,600 m where the temperature is approximately 2-3° C. It may take 3 to 6 minutes for the material to travel up the riser pipe where the temperature will be approximately 4°C (i.e., roughly a 1°C increase) before it reaches the surface. At the surface the material will be dewatered, during which time (duration varied and unknown), the temperature will rise. Finally the material is discharged back down the pipe (again 3 to 6 minutes), with the potential for cooling to occur during descent. 2. Methodology <strong>Nautilus</strong> provided a ‘representative’ sample of ore (sample No. A10988), already crushed to 3.35 mm particle size, in vacuum sealed bags, which will exclude oxygen 4
and minimize air oxidation. However it is assumed that some exposure to air has occurred during the processing which would result in some surface oxidation. The ore was exposed to air prior to each set of expriments. 2.1 Phase 1: Effect of Time Experimental conditions: Time series: 0, 5, 10, 15, 30, 60, 180, 420, 720 and 1,440 minutes. • Experiment run in an incubator at 6°C in the dark . • Solids:Seawater ratio of 1:10 (10%), 25g ore in 250 ml 0.45 !m filtered seawater. • All samples were shaken for 5 minutes at 6 o C in the dark at the beginning of the experiment before being placed in the incubator. • After each time period bottles were allowed to settle a further 30 minutes at 6 o C. • 3 replicates were included for 0, 60 and 1,440 minute time periods with single samples for other time intervals. Blanks were included for 0, 60 and 1,440 minute time periods The remaining ore from each time interval was shipped to ALS in Brisbane for geochemical characterisation. 2.2 Phase 2: Effect of Temperature Experimental Conditions: • Samples incubated at 12 and 24 o C for 180 minutes. • Solids:Seawater ratio of 1:10 (10%), 25g ore in 250 ml 0.45 !m filtered seawater. • All samples shaken for 5 minutes at the beginning of the experiment • The bottles were kept in the dark during the course of the experiments. • After the time period bottles were allowed to settle a further 30 minutes at the experimental temperature. • 3 replicates and a blank were included for each temperature. 2.3 Seawater sample preparation: 1. Following the settling period, the supernatant was decanted and centrifuged. 5
Page 1: ./0123/M./T!6 1MP!8T ST!T.M./T 1a$t
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 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 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
Page 159 and 160:
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
Page 185 and 186:
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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