GALAXY LITHIUM AUSTRALIA LTD ENVIRONMENTAL NOISE … · Galaxy Lithium Australia Limited...
Transcript of GALAXY LITHIUM AUSTRALIA LTD ENVIRONMENTAL NOISE … · Galaxy Lithium Australia Limited...
Rochdale Holdings Pty Ltd A.B.N. 85 009 049 067 trading as:
HERRING STORER ACOUSTICS P.O. Box 219, Como, W.A. 6952 (08) 9367 6200 [email protected]
GALAXY LITHIUM AUSTRALIA LTD
ENVIRONMENTAL NOISE ASSESSMENT
MT CATTLIN OPERATIONS
NIGHT OPERATIONS
SEPTEMBER 2019
OUR REFERENCE: 24632‐3‐19046
Herring Storer Acoustics
DOCUMENT CONTROL PAGE
ENVIRONMENTAL NOISE ASSESSMENT MT CATTLIN OPERATIONS
NIGHT OPERATIONS
Job No: 19046
Document Reference : 24632‐3‐19046
FOR
GALAXY LITHIUM AUSTRALIA LTD
DOCUMENT INFORMATION
Author: P. Drew Checked By: Tim Reynolds
Date of Issue : 10th September 2019
REVISION HISTORY
Revision Description Date Author Checked
1 Draft 2/8/2019 PD TR
2 Report with corrections 26/8/2019 PD ‐
3 Revised fleet 10/9/2019 PD TR
DOCUMENT DISTRIBUTION
Copy No. Revision No. Destination Hard Copy Electronic Copy
1 3 Galaxy Lithium Australia Ltd James Hesford: [email protected] Keith Muller: [email protected]
Herring Storer Acoustics Our Ref: 24632‐3‐19046
CONTENTS
1.0 INTRODUCTION 1
2.0 ACOUSTIC CRITERIA 2
3.0 METHODOLOGY 3
4.0 PREDICTIONS AND ASSESSMENT 4
5.0 CONCLUSION 7
APPENDICES A Sound Power Levels B Noise Contour Plots C Mining Scenarios
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1.0 INTRODUCTION Galaxy Lithium Australia Limited commissioned Herring Storer Acoustics to carry out acoustic modelling of noise emissions for proposed extension of mining operations to the night period. The proposal is to operate a reduced fleet of diggers and haul trucks, with the mitigation of noise emissions towards the Ravensthorpe town site and other southern receptors by acoustic bunds and waste tipping on the northern side of waste dumps during the night period. Mining of the NW Pit has been modelled to include the use of a smaller number of larger capacity CAT 785 Haul Trucks, instead of CAT 777 Haul Trucks operating in the other mining areas. Noise characteristic is to be minimized by use of wheeled dozers in lieu of track machines. Processing and crushing have been included. The operations are intended to comply with the ‘assigned levels’ under the Environmental Protection (Noise) Regulations 1997, with adaptive operational planning to maintain compliance. Commencement date is subject to approvals and change of Licence condition. The proposal is to commence night mining in January 2020. Drilling has not been included in the proposal, due to the potential for existing top‐hammer units to emit noise with tonal characteristic, which may be unacceptable during the night period when background noise levels at receptors can be low. Downhole hammer drills have the potential to resolve this issue, investigations into downhole drilling unit noise emissions are being undertaken. However, no drilling will occur during the night period unless it has been determined through measurement, that the drill noise emissions will be compliant at receptor locations.
Figure 1 – Mt Cattlin minesite and surrounds showing receptor locations
R1
R4
R5
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Highly Noise Sensitive receptors R1, R4 & R5 have been acquired by Galaxy Lithium Australia and the assessment of noise emissions is therefore not required to these locations. The most significant receptors are R6 and R8, located at the northern edge of the Ravensthorpe town‐site. Noise emissions from the proposed TSF Waste Dump has the potential to affect receptors to the south, being receptors R2 & R9. The Mt Cattlin site has a number of ‘highly noise sensitive’ receptors to the SW, S and SE (Ravensthorpe townsite). An aerial view of the site and surrounds shows these.
2.0 ACOUSTIC CRITERIA The criteria used is in accordance with the Environmental Protection (Noise) Regulations 1997 (as amended). These regulations stipulate maximum allowable external noise levels that can be received at a premises. For noise sensitive premises, the assigned or allowable noise levels are determined by the calculation of an influencing factor. The influencing factor is calculated for the usage of land within the two circles, having radii of 100m and 450m from the premises of concern. The base ‘assigned levels’ are listed in Table 2.1. For commercial and industrial premises the ‘assigned noise’ levels are fixed, as also shown in Table 2.1.
TABLE 2.1 –ASSIGNED OUTDOOR NOISE LEVELS
Type of premises receiving noise Time of day
Assigned level (dB)
LA 10 LA 1 LA max
Noise sensitive premises: highly sensitive area (i.e within 15m of a dwelling)
0700 to 1900 hours Monday to Saturday 45 + IF 55 + IF 65 + IF
0900 to 1900 hours Sunday and public holidays
40 + IF 50 + IF 65 + IF
1900 to 2200 hours all days 40 + IF 50 + IF 55 + IF
2200 hours on any day to 0700 hours Monday to Saturday and 0900 hours Sunday and public holidays
35 + IF 45 + IF 55 + IF
Noise sensitive premises: any area other than highly sensitive area All hours 60 75 80
Commercial premises All hours 60 75 80
Industrial and utility premises other than those in the Kwinana Industrial Area
All hours 65 80 90
Note: The LA10 noise level is the noise that is exceeded for 10% of the time. The LA1 noise level is the noise that is exceeded for 1% of the time. The LAmax noise level is the maximum noise level recorded. IF = Influencing Factor
It is a requirement that noise from the site be free of annoying characteristics (tonality, modulation and impulsiveness) at other premises, defined below as per Regulation 9. Where the above characteristics are present and cannot be practicably removed, the adjustments as listed in Table 2.2 are made to the measured or predicted level at other premises.
TABLE 2.2 – ADJUSTMENTS FOR ANNOYING CHARACTERISTICS WHEN MUSIC IS NOT PRESENT
Where tonality is present Where modulation is present Where impulsiveness is present
+ 5 dB + 5 dB + 10 dB
Note: Where music is present the adjustment is +10 dB, and is +15dB if impulsiveness is present. The adjustments are cumulative to a maximum of 15 dB.
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A summary of the determined ‘influencing factors’ and ‘assigned’ LA10 noise levels are shown in Table 2.3.
TABLE 2.3 – DETERMINED NIGHT‐TIME LA10 ASSIGNED LEVELS
3.0 METHODOLOGY Noise levels were predicted using the acoustic software SoundPlan for worst case wind conditions in accordance with the DWER Draft Guideline on Environmental Noise for Prescribed Premises (May 2016). It is noted that ‘worst case’ wind conditions refer to conditions where there is a temperature inversion in conjunction with light winds in the direction from noise source to receiver, resulting in effective sound propagation receiver locations. The sound power levels used in the acoustic modelling are tabulated in the Appendix A. Sound power levels are based on site measurements at Mt Cattlin. Predicted noise emissions at night have been made for January, June and December 2020. Following the development of the eastern waste dump by December 2020, this waste dump is expected to act as a significant acoustic barrier to noise emissions towards the Ravensthorpe town‐site. Noise emissions to the town‐site will gradually reduce from December 2020, therefore there is no need to predict noise emissions beyond this time period as the worst case situations will have already occurred.
Receptor Influencing Factor
Night‐timeAssigned LevelLA10 dB(A)
Sun/Holiday Assigned Level LA10 dB(A)
WeekdayAssigned LevelLA10 dB(A)
R1 – rural residence to the NNW of the plant near the Newdegate Ravensthorpe Road. Residence acquired by Galaxy.
NA NA NA NA
R2 – demountable accommodation SW of the plant near the South Coast Highway
0 35 40 45
R5 – rural residence north of R1. . Residence acquired by Galaxy.
0 35 40 45
R6 – residence at north‐east of Ravensthorpe townsite
0 35 40 45
R8 – accommodation camp / residences north edge of Ravensthorpe townsite
0 35 40 45
R9 – house (constructed since 2012) SW of plant, west of R2. Influencing factor of 2 due to nearby grain storage facility.
2 37 42 47
R10 – rural residence SW of plant 0 35 40 45
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4.0 PREDICTIONS AND ASSESSMENT
The Galaxy Lithium Mt Cattlin site operates under an Operational Noise Management Plan.
The most significant individual noise generating operation is expected to be tipping and pushing of waste on the southern edge of the waste dump. To minimize the potential for annoyance and noise emission from this operation, it is proposed to utilize a wheel dozer in lieu of a track dozer for pushing at night. In some circumstances a track dozer may be required, for example when pushing on a slope where use of a wheel dozer may not be a safe option. In these situations the use of a track dozer should be deferred until the day period.
The waste dump development east of the existing waste dump is to be developed commencing on the southern side of each bench, so that sections of elevated waste dump provide an acoustic barrier to tipping to the north.
The proposed noise mitigation measures are:
● Use of wheeled dozer on Waste Dumps at night.
● Provision of nominated acoustic barrier bunds to main haul roads with line of sight to the southern receptors.
● No operation of track dozers or top‐hammer drills in the night period, to
avoid generating ‘tonal’ noise emissions due to the relatively low background noise encountered during parts of the night‐time period.
● Waste tipping and spreading to be carried out on the north side of acoustic
barriers, shielding noise emissions to the Ravensthorpe town site and the southern receptors.
● Maintain acoustic bund immediately south of modular crushing circuit at
RL181 to top of bund eastern 2/3 and RL178 to top of bund remaining western 1/3. Stockpile to SW (evident as two stockpiles in Appendix C images) will be joined with to at RL282 as a minimum.
Noise emissions have been predicted for a scenario at January 2020, one scenario in June 2020 and one scenario in December 2020, for ‘allwinds’‐ worst case inversion condition winds from noise source to receiver. Predictions for the summer scenarios have also been made for the summer prevailing south‐easterly wind condition. The prevailing winter wind condition is from the north (NW), therefore the ‘allwinds’ prediction reasonably represents the prevailing winter condition.
TABLE 4.1 – PREDICTED NOISE EMISSIONS DURING NIGHT OPERATION SCENARIOS
Receptor R2 R6 R8 R9 R10 Comment
Night‐time Assigned Level LA10 dB(A) 35 35 35 37 35
Scenario 1: Jan 2020 – Worst Case Winds 33 35 33 34 35 Complies
Scenario 1: Jan 2020 – SE Winds 26 27 25 27 35 Complies
Scenario 2: June 2020 – Worst Case Winds 33 35 33 35 32 Complies
Scenario 3: June 2020 – Worst Case Winds 33 34 32 34 33 Complies
Scenario 3: June 2020 – SE Winds 28 28 27 29 31 Complies
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Appendix B contains the predicted noise contour plots. The relevant spot predicted noise emissions for the key receptors are shown in Table 4.1. The predictions show that noise emissions are capable of complying with the regulation night‐time ‘assigned levels’. Figure 2 (north to the top) shows the nominal topography of the proposed waste dump and partially developed pits as expected at January 2020. Acoustic bunds on southern side of haul roads are not shown in these figures.
Figure 2 – Forecast Nominal Waste Dump and Pit Topography January 2020 Figure 3 shows the nominal topography of the proposed waste dump and partially developed pits as expected at June 2020.
Figure 3 – Forecast Nominal Waste Dump and Pit Topography June 2020
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Figure 4 – Forecast Nominal Waste Dump and Pit Topography December 2020 Once completed, the proposed eastern waste dump will provide an acoustic and visual barrier to mining operations on the northern side. Figure 5 shows the nominal topography of the final stage of the eastern waste dump.
Figure 5 – Forecast Completed Eastern Waste Dump (NW Pit not shown) The mining scenarios and associated acoustic barriers are shown in Appendix C. The acoustic modelling shows that noise emissions from the proposed Night Operations in combination with processing operations is capable of complying with the requirements of the Environmental Protection (Noise) Regulations 1997. Under ‘worst case’ wind conditions towards the Ravensthorpe town‐site, there will be mining phases where noise mitigation is required to achieve compliance. Required measures include use of acoustic barriers to mining and haul routes.
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5.0 CONCLUSION Galaxy Lithium Australia Limited commissioned Herring Storer Acoustics to carry out acoustic modelling of noise emissions for proposed extension of mining operations to the night period. The proposal is to operate a reduced fleet of diggers and haul trucks, with the mitigation of noise emissions towards the Ravensthorpe town site and other southern receptors by acoustic bunds and waste tipping on the norther side of waste dumps during the night period. Noise characteristic is to be minimized by use of wheeled dozers in lieu of track machines. Mining of the NW Pit has been modelled to include the use of a smaller number of larger capacity CAT 785 Haul Trucks, instead of CAT 777 Haul Trucks operating in the other mining areas. Processing and crushing have been included. The operations are intended to comply with the ‘assigned levels’ under the Environmental Protection (Noise) Regulations 1997, with adaptive operational planning to maintain compliance. Commencement date is subject to approvals and change of Licence condition. The proposal is to commence night mining in January 2020. The proposed noise mitigation measures are:
● Use of wheeled dozer on Waste Dumps at night.
● Provision of nominated acoustic barrier bunds to main haul roads with line of sight to the southern receptors.
● No operation of track dozers or top‐hammer drills in the night period, to
avoid generating ‘tonal’ noise emissions due to the relatively low background noise encountered during parts of the night‐time period.
● Waste tipping and spreading to be carried out on the north side of acoustic
barriers, shielding noise emissions to the Ravensthorpe town site and the southern receptors.
● Maintain acoustic bund immediately south of modular crushing circuit at
RL181 to top of bund eastern 2/3 and RL178 to top of bund remaining western 1/3. Stockpile to SW (evident as two stockpiles in Appendix C images) will be joined with to at RL282 as a minimum.
Noise emissions at night have been predicted for January, June and December 2020. Following the development of the eastern waste dump by December 2020, this waste dump is expected to act as a significant acoustic barrier to noise emissions towards the Ravensthorpe town‐site. Noise emissions to the town‐site will gradually reduce from December 2020, therefore there is no need to predict noise emissions beyond this time period as the worst case situations will have already occurred.
Predictions for the summer scenarios have also been made for the summer prevailing south‐easterly wind condition. The prevailing winter wind condition is from the north (NW), therefore the ‘allwinds’ prediction reasonably represents the prevailing winter condition. The acoustic modelling shows that noise emissions from the proposed Night Operations in combination with processing and crushing operations is capable of complying with the requirements of the Environmental Protection (Noise) Regulations 1997.
APPENDIX A
Acoustic Model Sound Power Levels
Description LWA 31.5 40 50 63 80 100 125 160 200 250 315 400 500 630 800 1k 1.25k 1.6k 2k 2.5k 3.15k 4k 5k 6.3k 8k 10k
17Jan Screen B 105 97 111 96 115 104 107 99 94 93 93 95 95 93 93 94 93 93 94 94 94 94 93 92 92 89 87
17Jan Screen C 105 109 119 96 105 98 97 97 95 96 98 95 96 94 94 94 93 94 94 95 94 93 92 92 93 89 87
17Jan Screen D 105 109 119 96 105 98 97 97 95 96 98 95 96 94 94 94 93 94 94 95 94 93 92 92 93 89 87
17Jan Screen E 96 99 106 92 103 98 93 89 88 90 90 90 85 85 87 93 85 85 84 83 83 82 82 81 82 79 76
17Jan Screen F 106 108 112 105 107 102 101 105 100 106 108 103 97 94 96 96 95 98 95 93 93 92 91 89 87 86 84
17Jan Screen H 96 108 92 101 103 98 94 90 88 86 89 86 87 85 86 86 85 86 87 87 85 84 84 80 79 77 74
Existing Generators 96 105 96 98 99 105 109 102 98 101 96 91 84 87 88 89 85 85 83 83 80 79 78 74 72 68 66
Plant Screen G 106 108 112 105 107 102 101 105 100 106 108 103 97 94 96 96 95 98 95 93 93 92 91 89 87 86 84
Stockpile Bin 96 93 99 89 99 87 85 85 85 89 87 82 80 80 78 78 79 76 76 76 76 78 80 83 86 89 91
17Jan Screen A 96 109 105 85 97 90 97 93 86 87 85 86 86 84 86 86 85 85 83 84 84 83 83 83 85 82 80
Proces Optical Sorter Rolls Crusher
88 76 76 82 82 82 91 86 82 86 85 85 85 82 81 79 80 79 76 70 71 70 70 68 68 68 67
Proces Optical Sorter VSI Crusher
96 84 84 90 90 90 99 94 90 94 93 93 93 90 89 87 88 87 84 78 79 78 78 76 76 76 75
Proces Optical Sorter Fines Screen
105 97 111 96 115 104 107 99 94 93 93 95 95 93 93 94 93 93 94 94 94 94 93 92 92 89 87
18Mar Optio Screen 105 109 119 96 105 98 97 97 95 96 98 95 96 94 94 94 93 94 94 95 94 93 92 92 93 89 87
18Mar Optio Screen 105 109 119 96 105 98 97 97 95 96 98 95 96 94 94 94 93 94 94 95 94 93 92 92 93 89 87
CAT 777D WD4 115 104 107 116 124 110 108 110 105 106 105 106 102 108 111 109 107 105 106 104 101 100 98 94 93 90 88
CAT 785D T1 118 113 108 108 111 108 110 110 105 110 110 107 114 112 106 109 107 106 107 105 105 101 100 97 94 91
CAT Wheel Dozer1 114 91 107 99 108 103 103 105 108 106 103 102 107 103 105 106 106 103 105 103 101 99 97 98 95 93 93
CAT 16H Grader 105 95 97 110 103 98 98 100 94 88
CAT 773 Water Cart 1
116 90 102 101 106 103 98 105 112 118 104 102 105 109 108 106 108 105 106 108 106 102 100 98 96 94 94
Articulated Truck No. 1
106 100 105 102 116 103 111 106 113 110 101 93 92 96 93 100 97 94 95 92 92 88 88 86 83 80 79
CAT 785D T2 115 110 105 105 108 105 107 107 102 107 107 104 111 109 103 106 104 103 104 102 102 98 97 94 91 88
Komatsu PC1250 Excavator 1
115 92 100 97 104 102 105 125 112 112 115 107 101 105 110 108 105 105 102 103 101 98 96 94 91 89 86
CAT 785D 6 115 110 105 105 108 105 107 107 102 107 107 104 111 109 103 106 104 103 104 102 102 98 97 94 91 88
CAT Wheel Dozer 2 114 91 107 99 108 103 103 105 108 106 103 102 107 103 105 106 106 103 105 103 101 99 97 98 95 93 93
Komatsu PC1900 Excavator 1
117 114 117 126 120 114 111 105 100 96
CAT 785D WD5 118 113 108 108 111 108 110 110 105 110 110 107 114 112 106 109 107 106 107 105 105 101 100 97 94 91
CAT 777D 8 115 104 107 116 124 110 108 110 105 106 105 106 102 108 111 109 107 105 106 104 101 100 98 94 93 90 88
CAT 777D 7 115 104 107 116 124 110 108 110 105 106 105 106 102 108 111 109 107 105 106 104 101 100 98 94 93 90 88
CAT 777D 9 115 104 107 116 124 110 108 110 105 106 105 106 102 108 111 109 107 105 106 104 101 100 98 94 93 90 88
CAT 777D T10 115 104 107 116 124 110 108 110 105 106 105 106 102 108 111 109 107 105 106 104 101 100 98 94 93 90 88
E482 Rapid Primary Screen
108 91 93 93 97 97 100 99 97 99 101 98 96 98 101 100 99 100 97 97 95 95 92 88 86 84 81
18Feb Rapid Screen E394
98 52 53 59 62 69 73 77 78 76 88 89 89 86 89 88 88 89 88 88 86 86 85 84 82 81 78
18Feb Rapid Screen E328
98 51 53 59 64 68 75 77 79 83 84 89 92 88 88 90 87 88 88 86 86 85 84 81 79 79 75
Description LWA 31.5 40 50 63 80 100 125 160 200 250 315 400 500 630 800 1k 1.25k 1.6k 2k 2.5k 3.15k 4k 5k 6.3k 8k 10k
Rapid Jaw Crusher 115 61 75 80 93 98 98 96 99 101 99 99 100 104 108 108 104 106 104 105 103 104 104 103 95 93 88
18Feb Rapid Cone E250
105 54 57 66 70 75 86 85 85 91 93 95 97 95 96 96 97 97 95 93 92 91 90 88 87 86 84
18Feb Rapid Cone E481
105 55 58 68 68 72 81 88 86 88 90 93 94 94 96 98 97 98 95 94 93 93 89 87 85 83 80
18Feb Rapid Office Generator
88 41 47 49 64 54 58 63 71 74 75 76 79 77 81 84 75 75 75 77 77 74 73 68 67 65 62
18Feb Rapid Gen 517
102 57 57 70 75 72 82 91 89 96 96 89 89 93 93 95 94 94 91 91 90 88 87 83 78 75 71
18Feb Rapid Gen E305
95 50 54 59 61 71 78 78 81 86 83 84 87 88 87 87 86 86 85 84 82 82 79 77 74 71 68
18Feb Rapid Gen E298
103 52 58 73 62 69 73 75 82 92 85 85 91 90 91 92 94 94 93 94 92 92 89 86 81 78 74
Rapid Crusher Loader
106 95 103 93 102 95 102 95 100 100 104 102 101 93 94 95 97 97 96 97 93 92 92 87 86 82 78
Optio Sorter (South of ROM) Unit 1
112 91 98 92 93 94 95 98 95 99 100 101 96 95 95 95 94 92 92 93 94 98 102 102 102 103 104
Optio Sorter (South of ROM) Unit 2
112 91 98 92 93 94 95 98 95 99 100 101 96 95 95 95 94 92 92 93 94 98 102 102 102 103 104
18Mar Optio Screen Rapid 1
106 108 112 105 107 102 101 105 100 106 108 103 97 94 96 96 95 98 95 93 93 92 91 89 87 86 84
18Mar Optio Screen Rapid 2
106 108 112 105 107 102 101 105 100 106 108 103 97 94 96 96 95 98 95 93 93 92 91 89 87 86 84
APPENDIX B
11 Processing and Mining – January 2020 – Scenario 1 ‐ Worst Case Winds 13 Processing and Mining – January 2020 – Scenario 1 – SE Summer Prevailing Winds 15 Processing and Mining – June 2020 – Scenario 2 – Worst Case Winds 17 Processing and Mining – Dec 2020 – Scenario 3 – Worst Case Winds 19 Processing and Mining – Dec 2020 – Scenario 3 – SE Summer Prevailing Winds
Summer Prevailing Wind
Summer Prevailing Wind
APPENDIX C
MINING SCENARIOS Scenario 1 January 2020 Scenario 2 June 2020 Scenario 3 December 2020
Galaxy Resources Limited
meeting a lithium future
Sequence of Mining & Dumping – January 2020
290mRL
2SW PitIn-pit tails
260mRL
WD2 NW 250mRL
220mRL
SE Pit
NE Pit
NW PitPart 1255mRL
1F backfill205mRL
225mRL
Galaxy Resources Limited
meeting a lithium future
Sequence of Mining & Dumping - June 2020
290mRL
2SW PitIn-pit tails
200mRL
205mRL
Stage 1Fcomplete
200mRL
SE Pit
NE Pit
NW PitPart 2 SE_W Pit
250mRL
260mRL
NW PitPart 1
270mRL
260mRL
260mRL
Galaxy Resources Limited
meeting a lithium future
Sequence of Mining & Dumping - December 2020
290mRL
2SW PitIn-pit tails
190mRL
WD2 NW Dump260mRL
Backfill210mRL
SE Pitcomplete
NE PitNW PitPart 2
NW PitPart 1
220mRL
270mRL
250mRL
260mRL