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Revision 1 – 31-May-2017 Prepared for – Terramin Exploration Pty Ltd – ABN: 66 122 765 708

Bird in Hand Gold Mine

Terramin Exploration Pty Ltd

31-May-2017

Doc No. 60535016-A17E01RP-1

Commercial-in-Confidence


Noise Impact Assessment

AECOM


Bird in Hand Gold Mine – Noise Impact Assessment




Noise Impact Assessment

Client: Terramin Exploration Pty Ltd

ABN: 66 122 765 708

Prepared by

AECOM Australia Pty Ltd

Level 28, 91 King William Street, Adelaide SA 5000, Australia

T +61 8 7223 5400 F +61 8 7223 5499 www.aecom.com

ABN 20 093 846 925

31-May-2017

Job No.: 60535016

AECOM in Australia and New Zealand is certified to ISO9001, ISO14001 AS/NZS4801 and OHSAS18001.

© AECOM Australia Pty Ltd (AECOM). All rights reserved.

AECOM has prepared this document for the sole use of the Client and for a specific purpose, each as expressly stated in the document. No other

party should rely on this document without the prior written consent of AECOM. AECOM undertakes no duty, nor accepts any responsibility, to any

third party who may rely upon or use this document. This document has been prepared based on the Client’s description of its requirements and

AECOM’s experience, having regard to assumptions that AECOM can reasonably be expected to make in accordance with sound professional

principles. AECOM may also have relied upon information provided by the Client and other third parties to prepare this document, some of which

may not have been verified. Subject to the above conditions, this document may be transmitted, reproduced or disseminated only in its entirety.

AECOM





Quality Information

Document Bird in Hand Gold Mine

Ref 60535016

Date 31-May-2017

Prepared by Natalie Redmond

Reviewed by Simon Moore

Revision History

Rev Revision Date Details

Authorised

Name/Position Signature

0 30-May-2017 Initial Issue Simon Moore - Team Leader, Acoustics

Signed

1 31-May-2017 Comments Captured Simon Moore Team Leader - Acoustics

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Table of Contents

Glossary i Executive Summary ii 1.0 Introduction 1

1.1 Project description 1 2.0 Nearest noise-sensitive receivers 3

2.1 Existing noise environment 3 3.0 Noise criteria 7

3.1 Construction noise criteria 7 3.1.1 Construction noise criteria summary 7

3.2 Operational noise criteria 8 3.3 Construction and operation scenario summary 9

4.0 Noise modelling methodology 10 4.1 Inputs to model 10

4.1.1 Terrain 10 4.1.2 Ground absorption 10 4.1.3 Meteorological conditions 10 4.1.4 Noise-sensitive receivers 10 4.1.5 Buildings and features 10 4.1.6 Ventilation fan silencers 11

4.2 Modelled scenarios 11 4.3 Noise sources 11 4.4 Sound power levels 14

5.0 Predicted noise levels 15 5.1 Assessment of annoying characteristics 15 5.2 Mine development 15 5.3 Operation 16

6.0 Conceptual noise mitigation 17 6.1 Acoustic screening 17

6.1.1 Mine development – Raise borer at magazine shaft 17 6.1.2 Mine development – Raise borer at primary ventilation shaft 17 6.1.3 Mine development – Raise borer at underground escape-way raise 18

6.2 Treatment of Impulsive Noise Sources 18 6.2.1 ROM bin and conveyer system 18 6.2.2 Predicted noise levels 18

6.3 Noise mitigation summary 19 7.0 Construction noise 19 8.0 Conclusion 1

Appendix A Source sound power level spectra A

Appendix B Predicted noise levels B

Appendix C Noise contour plots C

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Glossary

‘A’ Weighted Frequency filter designed to adjust the absolute sound pressure levels to correspond to the subjective response of the human ear.

dB(A) ‘A’ Weighted overall sound pressure level measured in decibels.

SPL Sound Pressure Level - The incremental variation of sound pressure above and below atmospheric pressure and expressed in decibels. The human ear responds to pressure fluctuations, resulting in sound being heard.

LAeq Equivalent (energy averaged) noise level measured over a time period. This noise descriptor is commonly used in environmental noise policies and assessments. The time period the measurement is averaged over may be included in the subscripted, i.e. LAeq,15min.

Lpeak The maximum instantaneous noise level to which a person is exposed.

LAmax The maximum A-Weighted noise level recorded over a measurement period.

LAmin The minimum A-Weighted noise level recorded over a measurement period.

LA90 The noise level exceeded 90% of the measurement period. This descriptor is used to represent the background noise level.

ABL Assessment Background Level. The 10th percentile of the LA90 noise levels

recorded over the measurement period.

ADT Articulated Dump Truck

DPTI Department of Planning Transport and Infrastructure

EPA South Australia Environment Protection Authority

IML Integrated Mullock Landform

IT Carrier Integrated Tool Carrier

LV Light Vehicle

MLP Mining Lease Proposal

Noise EPP Environment Protection (Noise) Policy 2007

ROM Run of Mine

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Executive Summary

AECOM has been engaged by Terramin Exploration to assess the effect of construction and operational noise from the proposed Bird in Hand Gold Mine upon neighbouring noise sensitive receivers.

This report outlines the construction and the operational noise assessments that were undertaken and provides conceptual noise mitigation treatments to comply with the applicable noise criteria. These assessments have been prepared in accordance with the Environmental Protection Authority’s (EPA’s) Environment Protection (Noise) Policy 2007 (Noise EPP).

Noise criteria

The EPA provides noise goals for noise sources in order to satisfy the general environmental duty as defined by Section 25 of the South Australian Environment Protection Act 1993. Noise goals are set in accordance with the Noise EPP and are derived based on the land uses principally promoted by the relevant development plan. The equivalent continuous noise level criteria are 52 dB(A) during the day time period and 45 dB(A) during the night time period.

The mine is anticipated to operate on a 24-hour basis, however separate day time and night time scenarios were modelled as not all site operations will occur during the night time period.

Noise predictions

Predictions of noise levels from the project were undertaken using a noise model produced in SoundPLAN version 7.4 environmental noise modelling software. The model takes into account the surrounding existing terrain and the terrain altered by the project during mine development and operation.

Predicted noise levels assume worst case conditions for noise propagation, corresponding to CONCAWE (Conservation of Clean Air and Water in Europe) Meteorological Category 6 at night and Meteorological Category 5 at day, as required by the Noise EPP.

The equivalent continuous noise level (LAeq) has been predicted for four scenarios:

Mine development, during the day time, to comply with the Noise EPP

Mine development, during the night time, to comply with the Noise EPP

Mine operations, during the day time, to comply with the Noise EPP

Mine operations, during the night time, to comply with the Noise EPP

Operational noise emissions – During mine development

The day time and night time mine development scenarios are based on the noise modelling methodology outlined in Section 4.0 and the noise sources listed in Table 6. There were no predicted exceedances of the applicable noise criteria for the night time scenario. For the day time scenario, there was initially predicted to be one noise sensitive receiver where the applicable noise criterion is exceeded. The major noise source responsible for the noise criteria exceedance is the raise borer.

Temporary acoustic shielding is proposed to treat the noise emissions from the raise borer, either by erecting temporary fencing or the placement of shipping containers adjacent to the raise borer. The raise borer was modelled excavating at three separate shaft locations. The shielding proposed will result in no receivers exceeding the noise criteria for all three raise borer locations.

Operational noise emissions – During mine operation

The day time and night time operational scenarios are based on the noise modelling methodology outlined in Section 4.0 and the noise sources listed in Table 7. It was identified that an impulsive characteristic penalty will apply to both the day time and night time scenarios due to noise from ore dropping into the surge bin and ore loading into haul trucks. Noise levels during mine operation are

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predicted to exceed the applicable noise criteria during both the day time and night time scenario due to this impulsive noise character penalty.

Acoustic enclosures are proposed around the ore unloading point and ore haul truck loading point to treat the impulsive noise emissions. This treatment will result in no receivers predicted to exceed the applicable noise criteria.

Construction noise emissions

Construction activities will capture the initial works on site including site clearing, road grading, earthworks and construction of surface infrastructure. These works will only be undertaken during the day and the Noise EPP does not provide any specific noise criteria for construction work undertaken between 7.00 am and 7.00 pm, Monday to Saturday. However, it is required that all reasonable and practicable measures are taken to minimise noise and adverse impacts from construction activity.

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1.0 Introduction

AECOM has been engaged by Terramin Exploration to assess the effect of construction and operational noise from the proposed Bird in Hand Mine upon the neighbouring noise sensitive receivers.

This report outlines the construction and operational noise assessment which includes the modelling of the mining during construction and operation. This assessment has been prepared in accordance with the Environmental Protection Authority’s (EPA’s) Environment Protection (Noise) Policy 2007 (Noise EPP).

The scope of work is to undertake an assessment of construction noise and operational noise for each significant stage of the mine operations (mine development and ore extraction). Note that blasting noise and vibration impacts are excluded from this assessment.

This Noise Impact Assessment will be included as a specialist acoustic report as an appendix to Terramin’s Mining Lease Proposal (MLP) for the Bird in Hand Mine.

1.1 Project description

The Bird in Hand Gold Mine is located approximately 3 km east of Woodside, South Australia. The proposed operation will be an underground gold mine. Processing of the ore will take place at Terramin’s existing processing facilities located at the Angas Zinc Mine, Strathalbyn, South Australia.

The location of the proposed mine site is shown in Figure 1.

Pfeiffer Road

Bird In Hand Road

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PROJECT ID

LAST MODIFIEDCREATED BY

60535016NRNR 31 MAY 2017

LEGENDRoadsSite BuildingsSite FeaturesSite Boundary

DATUM GDA 1994, PROJECTION MGA ZONE XX

F1Figure

Terramin Exploration Pty LtdBird in Hand Gold MineNoise Impact Assessment

GENERAL ARRANGEMENT

192 Pfeiffer Road, Woodside,South Australia

Map Document: (G:\GISMEL\AA_GIS_TEMPLATES\ArcGIS\Templates\AECOM\MXD\ENV_A4_Title_RHS_Landscape_v2.mxd)7/12/2009 -- 10:29:07 AM

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2.0 Nearest noise-sensitive receivers

The Noise EPP broadly defines noise sensitive receivers in Section 12 as premises that:

are in separate occupation from the noise source and used for residential or business purposes; or constitute a quiet ambient environment set aside as a park or reserve or for public recreation or enjoyment.

In the rural area surrounding the proposed site, the nearest sensitive receivers are generally residential properties. Sixteen residential properties have been included in this assessment with two additional wineries included as receivers for the day time noise assessment.

The receivers that have been assessed have been identified in Figure 2.

2.1 Existing noise environment

Measurements of existing noise levels in the areas surrounding the proposed site were undertaken over three different monitoring periods: September-October 2014, February-April 2015, and February-March 2016. The purpose for the different monitoring periods was to correspond with the local viticulture activities for periods outside of and during vintage. These measurements have allowed for the characterisation and quantification of the existing noise environment in the area surrounding the proposed Bird in Hand mine facility.

The four noise monitoring locations are shown in Figure 3.

Detailed results were previously reported in the following AECOM reports:

60318670-A15F01RP-2 (Pre-construction Noise Monitoring Report), dated 8 September 2015.

60318670-A16C01RP-0 (Pre-construction Noise Monitoring Report), dated 6 April 2016.

Day time and night time noise monitoring results have been summarised in Table 1 and Table 2.

Day time hours are from 7 am to 10 pm and night time hours are from 10 pm to 7 am, as defined in the Noise EPP.

Table 1 Summary of the median noise logging results, day time, in dB(A)

Location LAeq,15hr Highest LAeq,15min

Lowest LAeq,15min

Median LAeq,15min

Daytime ABL

During Vintage (February-March 2016)

Location 1 46 55 35 44 30

Location 2 47 54 35 46 27

Location 3 48 56 31 46 27

Location 4 47 55 36 46 29

During Vintage (February-April 2015)

Location 1 52 59 39 51 31

Location 2 49 57 34 46 28

Location 3 48 59 33 44 28

Location 4 47 57 32 46 30

Outside of Vintage (September-October 2014)

Location 1 46 52 34 43 31

Location 2 48 57 35 46 30

Location 3 48 58 29 43 29

Location 4 47 53 30 46 27

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Table 2 Summary of the median noise logging results, night-time, in dB(A)

Location LAeq,9hr Highest LAeq,15min

Lowest LAeq,15min

Median LAeq,15min

LAmax Night time

ABL

During Vintage (February-March 2016)

Location 1 38 47 30 35 69 27

Location 2 41 46 30 40 68 25

Location 3 41 51 27 33 78 24

Location 4 41 50 29 37 70 26

During Vintage (February-April 2015)

Location 1 44 53 28 38 73 26

Location 2 38 45 28 35 68 23

Location 3 40 49 28 35 75 25

Location 4 40 49 27 31 69 25

Outside of Vintage (September-October 2014)

Location 1 43 52 29 36 70 28

Location 2 45 56 28 36 76 25

Location 3 39 48 26 33 74 26

Location 4 44 53 24 33 77 22

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PROJECT ID


60535016NRNR 9 MAY 2017

LEGENDNoise-Sensitive Receivers! Residential! Business (Daytime only)

Site FeaturesSite BuildingsSite Boundary

DATUM GDA 1994, PROJECTION MGA ZONE XX Bird in Hand Gold MineNoise Impact Assessment192 Pfeiffer Road, Woodside, South Australia

Data sources:Base Data: (c) 20XX (data source)(additional data)

Map Document: (G:\GISMEL\AA_GIS_TEMPLATES\ArcGIS\Templates\AECOM\MXD\ENV_A3_Title_LOW_Landscape_v2.mxd)7/12/2009 -- 10:12:49 AM

2Figure


LOCATION OF NOISE-SENSITIVERECEIVERS

Location 4

Location 1

Location 2

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PROJECT ID


60535016NRNR 9 MAY 2017

LEGENDNoise Monitoring LocationsSite FeaturesSite BuildingsSite BoundaryDATUM GDA 1994, PROJECTION MGA ZONE XX Bird in Hand Gold Mine

Noise Impact Assessment192 Pfeiffer Road, Woodside, South Australia



3Figure


PRE-CONSTRUCTION NOISEMONITORING LOCATIONS

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3.0 Noise criteria

3.1 Construction noise criteria

The Noise EPP provides specific criteria for construction noise under Part 6—Special noise control provisions, Division 1—Construction noise for which compliance with will satisfy the General Environmental Duty.

Under the Policy, construction activity with an adverse impact on amenity must not occur on a Sunday or other public holiday, and on any other day except between 7.00am and 7.00pm. The following criteria are applicable at noise-affected premises for determining whether construction activities result in noise with an adverse impact on amenity:

The equivalent source noise level (LAeq,15min) should not exceed 45 dB(A).

The maximum source noise level (LAmax) should not exceed 60 dB(A).

However, if the ambient noise levels at the noise-affected premises exceed the 45 dB(A) equivalent noise criteria or consistently exceed the 60 dB(A) maximum noise criteria, the construction activity does not result in noise with an adverse impact on amenity unless:

Equivalent source noise levels (LAeq,15min) exceed the ambient noise level (LAeq,15min).

Maximum source noise levels (LAmax) consistently exceed the maximum ambient noise level (LAmax) or the frequency of occurrence of the maximum ambient noise level (LAmax).

A particular operation may occur on a Sunday or public holiday between 9.00am and 7.00pm, or may commence before 7.00am on any other day to avoid an unreasonable interruption of vehicle or pedestrian traffic movement or if other grounds exist that the Authority or other administering agency determines to be sufficient.

If a construction activity results in noise with an adverse impact on amenity, all reasonable and practicable measures must be taken to minimise noise resulting from the activity to minimise its impact. This includes (but is not limited to) the following measures to the extent practicable:

Scheduling particularly noisy activities to commence after 9.00am where reasonable and practicable to do so.

Locating noisy equipment (such as masonry saws) or processes so that their impact on neighbouring premises is minimised (whether by maximising the distance to the premises, using structures or elevations to create barriers or otherwise).

Shutting or throttling equipment down whenever it is not in actual use.

Ensuring that noise reduction devices such as mufflers are fitted and operating effectively; and

Ensuring that equipment is not operated if maintenance or repairs would eliminate or significantly reduce a characteristic of noise resulting from its operation that is audible at noise-affected premises.

Operating equipment and handle materials so as to minimise impact noise.

Using off-site or other alternative processes that eliminate or lessen resulting noise.

3.1.1 Construction noise criteria summary

Noise criteria applicable to the construction of the Bird in Hand Mine are summarised in Table 3.

Table 3 Construction noise criteria

Time period Noise level at noise-sensitive receivers

On a Sunday or other public holiday, and on any other day except between 9.00am and 7.00pm

(1) LAeq,15min 45 dB(A), see Note 2.

LAmax 60 dB(A), see Note 2.

Monday – Saturday, 7.00am and 7.00pm. No specific noise limit. Minimise construction noise where possible.

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Notes:

(1) A particular operation may occur on a Sunday or public holiday between 9.00am and 7.00pm, or may commence before

7.00am on any other day to avoid an unreasonable interruption of vehicle or pedestrian traffic movement or if other

grounds exist that the Environment Protection Authority or other administering agency determines to be sufficient.

(2) Construction activity does not result in noise with an adverse impact on amenity if LAeq,15min or LAmax ambient noise levels at

the noise-affected premises exceed the criteria levels, or if the frequency of maximum source noise levels (LAmax)

consistently exceeds frequency of occurrence of the maximum ambient noise level (LAmax).

3.2 Operational noise criteria

The EPA provides noise goals for noise sources in order to satisfy the general environmental duty as defined by Section 25 of the South Australian Environment Protection Act 1993. Noise goals are set in accordance with the Noise EPP and are determined based on the land uses principally promoted by the relevant development plan.

The proposed mining lease and the nearest noise-sensitive receivers are located within the Watershed (Primary Production) Zone with Onkaparinga Valley Policy Area as defined under the Adelaide Hills Council Development Plan.

The Development Plan provides the following objectives for the assessed zone and policy area:

Watershed (Primary Production) Zone:

Objective 1: The maintenance and enhancement of the natural resources of the south Mount Lofty Ranges.

Objective 2: The enhancement of the Mount Lofty Ranges Watershed as a source of high quality water.

Objective 3: The long-term sustainability of rural production in the south Mount Lofty Ranges.

Objective 4: The preservation and restoration of remnant native vegetation in the south Mount Lofty Ranges.

Objective 5: The enhancement of the amenity and landscape of the south Mount Lofty Ranges for the enjoyment of residents and visitors.

Objective 6: The development of a sustainable tourism industry with accommodation, attractions and facilities which relate to and interpret the natural and cultural resources of the south Mount Lofty Ranges, and increase the opportunities for visitors to stay overnight.

Onkaparinga Valley Policy Area:

Objective 1: The retention of the existing rural character by ensuring the continuation of farming and horticultural activities and excluding rural living or other uses which would require division of land into smaller holdings.

The Watershed (Primary Production) Zone makes reference to both Rural Industry and Rural Living land uses but the Onkaparinga Valley Policy Area specifically excludes rural living. Therefore, we are of the opinion that the land use principally promoted by the development plan is Rural Industry only.

Under Section 20 of the Noise EPP, where a development application is being sought under the Development Act 1993 the predicted source noise level for the development should not exceed the relative indicative noise level from Section 5, less 5 dB(A). While this Section does not strictly apply as the Bird in Hand development falls under the Mining Act 1971 it is not specifically excluded from the Noise EPP and therefore we believe the intent of the legislation would be to apply this 5 dB(A) reduction to the noise criteria.

Under the Noise EPP, the noise criteria for mining operations at the mine site are presented in Table 4.

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Table 4 Operational noise criteria

Receiver zone Noise level at noise-sensitive receivers

Day(1)

Night(1)

Watershed (Primary Production) LAeq 52 dB(A) LAeq 45 dB(A)

Note:

1. The Noise EPP classifies Day time as between 7.00 am and 10.00 pm on the same day and Night time as between 10.00

pm on one day and 7.00 am on the following day.

The Noise EPP also states that the measured source noise level must be adjusted by the following amounts if the noise source contains modulation, tonal, impulsive or low-frequency characteristics:

1 characteristic: +5 dB(A)

2 characteristics: +8 dB(A)

3 or 4 characteristics: +10 dB(A).

3.3 Construction and operation scenario summary

For the purposes of this acoustic assessment, the construction phase will capture the initial works including: Site clearing, road grading, earthworks and construction of surface infrastructure. Construction works will only take place during day time hours when no specific noise criteria apply. Noise levels from typical construction plant and equipment is included in Section 7.0.

There will be minimal difference in the plant operating on site during underground mine development in comparison to when ore haulage begins. Therefore, for the purpose of this acoustic assessment we have defined an interim mine development phase, which will be assessed against the operational rather than construction noise criteria. The mine development phase will span from when work begins underground on the main decline hauling waste rock, to when ore haulage begins.

The Bird in Hand Mine has been broken down into three scenarios, which have been listed with their associated noise criteria in Table 5.

Table 5 List of construction and operation scenarios and their associated criteria

Scenario Description Time Period Noise EPP Criteria, Leq, 15min

1. Construction (Site clearing, road grading, surface infrastructure and excavation of box cut)

Day time only No specific criteria

2. Operation (Mine Development) Day time 52 dB(A)

Night time 45 dB(A)

3. Operation (Ore haulage) Day time 52 dB(A)

Night time 45 dB(A)

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4.0 Noise modelling methodology

Prediction of noise levels from the mine during mine development and operation were undertaken using SoundPLAN version 7.4 environmental noise modelling software.

4.1 Inputs to model

The following sections outline the inputs that were included in the acoustic model.

4.1.1 Terrain

The terrain in the model is based on one-metre elevation contour lines of the project area provided by Terramin Exploration and five-metre elevation contour lines for the Onkaparinga Valley sourced from AECOM’s internal database. Elevation contour lines for the project area were provided in the form of the following DXF drawings:

‘20155706_BIH-Construction.dxf’

‘20155706_BIH-Peak Production.dxf’

4.1.2 Ground absorption

All cleared or developed ground onsite has been modelled as 50% acoustically absorptive with the remaining areas and surrounding properties modelled as 80% acoustically absorptive.

4.1.3 Meteorological conditions

Meteorological conditions such as the presence of a temperature inversion or light to moderate winds can have a significant effect on sound propagation.

Temperature inversions (i.e. when the normal temperature profile of the atmosphere is reversed such that the air temperature increases with increasing height above ground) typically occur at night and tend to assist the propagation of noise. Likewise, a light to moderate wind (i.e. 1 to 3 m/s) from the source to the receiver tends to assist the propagation of noise to the receiver, while the impact of noise for any receivers in the opposite direction would be reduced. For higher wind speeds, the wind becomes too turbulent to effectively assist the propagation of noise, and background noise levels tend to increase, masking any increases in noise level due to wind-assisted propagation.

Noise levels were predicted with meteorological Category 5 during the day time and Category 6 during the night time as required by the Noise EPP.

4.1.4 Noise-sensitive receivers

Noise levels at each noise sensitive receiver were predicted outside and at a height of 1.5 metres above ground in accordance with the measurement placement outlined in Section 12 of the Noise EPP.

4.1.5 Buildings and features

Onsite structures included in the model:

Workshop:

- 30.0 m long x 20.0 m wide x 7.0 m high, with 2 x (5.0 m wide x 5.0 m high) roller doors on the north-eastern façade.

- Colorbond or equivalent construction to walls and roof.

- Roller doors have been modelled as open during the day time period and closed during the night time period.

Batching Plant: - 6.0 m long x 10.0 m wide x 6.0 m high.

- Colorbond shed internally lined with 1x13 mm fiberock or equivalent to walls and roof.

- Ceiling internally lined with an exposed foil faced perforated insulation or building blanket (e.g. Fletcher Insulation Pink Noise Stop insulation or similar).

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Raw Water Pump Shed: 1 x raw water pump enclosed in 3.0m long x 3.0 m wide x 2.4 m high shed constructed from Colorbond or equivalent.

Water Processing Plant Pump Shed: 1 x water processing plant pump enclosed in 3.0m long x 3.0 m wide x 2.4 m high shed constructed from Colorbond or equivalent.

Wash-down Pad Pump Shed: 2 x wash-down pad pumps enclosed in 3.0m long x 3.0 m wide x 2.4 m high shed constructed from Colorbond or equivalent.

Administration Office: Three storey demountable with 20.0 m long x 10.0 m wide ground floor office space, and 6.0 m long x 10.0 m wide first and second floor for kitchen, crib and muster space. Each floor was modelled as 2.7 m high.

4.1.6 Ventilation fan silencers

Preliminary model iterations indicated that both the mine development and primary ventilation fans will require acoustic treatment so that the Noise EPP criteria can be met at the nearest noise sensitive receivers. The most cost effective method of treating noise from fans is the installation of silencers directly to the fan. The following levels of treatment have been included in the model for the mine development and primary ventilation fans respectively.

Mine Development Fan The mine development fans were already specified with silencers to reduce the sound power level to 108 dB(A) re 10

-12W. In order to comply with the noise level at the nearest noise sensitive receiver, an

additional 8 dB(A) of noise attenuation is required to the fan discharge to reduce the overall sound power level to not exceed 100 dB(A) re 10

-12W. This could be achieved with an additional 1D-2D

length un-podded silencer fitted to the fan.

Primary Ventilation Fan To achieve compliance with the Noise EPP criteria at the nearest noise sensitive receiver a reduction of at least 20 dB(A) is required. Each primary ventilation fan has been modelled with 1 x 1905CS-1D and 1 x 1905CSP-1D NAP Silentflo Circular Silencers attached directly to the fan discharge. This silencer selection provides an overall noise reduction from the primary ventilation fans of 23 dB(A).

4.2 Modelled scenarios

The Bird in Hand Mine has proposed times of operation spanning twenty-four hours per day, seven days per week. However, both day time and night time scenarios were modelled as not all site operations will occur during the night-time period.

The scenarios that have been modelled are the following:

1. Operation (Mine development) – Day time

2. Operation (Mine development) – Night time

3. Operation (Ore haulage) – Day time

4. Operation (Ore haulage) – Night time

4.3 Noise sources

The location, frequency and timing of noise sources included in the acoustic modelling are based on the following:

Site Layout Drawings ‘20155706_BIH Surface Layout – 2017-04-10.pdf’

Site Operation Report ‘20155706R003A Site Organisation Design Basis Report.pdf’

Scoping Study Report ‘BIH Revised Scoping Study 2016 – excerpts for RA sessions.pdf’

Mine Ventilation Report ‘BIH-001 Mine Ventilation Design (Rev 8 176 Apr 167 Draft)complete.pdf’

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Discussions with Terramin

Under the Noise EPP, noise from the source under consideration is predicted so as to determine its impact over a continuous 15-minute period. Where a noise source is not expected to operate continuously over a 15-minute period, adjustments are applied to account for duration to calculate an effective noise level over the time period.

Table 6 and Table 7 provide details of each noise source, including their assumed operation times during the modelled worst-case (i.e. highest noise level) 15-minute period for the mine development and mine operation (ore haulage) scenarios respectively.

Table 6 Operational noise source details – Mine development

Item/ Activity Details Operation Times

Daytime and Night Time Operation

Ventilation fans Twin 110kW mine development fans located at the tunnel entrance.

Fans will be treated with silencers see Section 4.1.6.

Assumed to be operational continuously during the 15-minute period.

Articulated dump truck (ADT) movements

2 x ADT will travel between the box cut and the top of the IML.

Each ADT will travel at 10 km/hr and remain at the IML for 1 minute allowing for positioning and unloading.

Integrated Tool Carrier (IT) movements

IT will travel between the tunnel and the workshop.

IT will travel at 10 km/hr and idle at the workshop for 5 minutes.

Cement mixing truck movements

Cement truck will travel between the tunnel and the batching plant.

Cement truck will travel at 10 km/hr and idle at batching plant for 5 minutes for loading.

Additional surface plant

2 x light vehicles idling

Air compressor


Structures The following structures with dimensions and construction as specified in Section 4.1.5.

Workshop

Batching Plant

Raw Water Pump Shed

Water Processing Plant Shed

Wash-down Pad Pump Shed


Daytime Operation Only

Raise borer

Raise Borer was modelled excavating at magazine shaft. Noise emissions were also assessed with the raise borer at the primary ventilation shaft and underground escape-way raise. See Note 1.


Drill rig (surface / services / longhole)

Drill rig at laydown area. Assumed to be operational continuously during the 15-minute period.

Delivery truck Delivery truck will travel between site entry and workshop.

Delivery truck will travel at 15 km/hr and idle at workshop/ amenities area for 5 minutes.

Front end loader Front end loader with low sound package located centrally on top of IML.


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13



Forklift at workshop

Water truck at laydown area


Note:

1. Additional modelling was undertaken with the raise borer located at the primary ventilation shaft and the underground

escape-way as discussed in Sections 6.1.2 and 6.1.3 respectively.

Table 7 Operational noise source details – Mine operation


Daytime and Night Time Operation

Ventilation fans Primary ventilation fans:

Primary fans are located approximately 100 metres below the ground and exhaust vertically at 6 metres above the ground from 4000 mm diameter circular shaft.

Primary fans will be treated with silencers see Section 4.1.6.

Magazine ventilation fans:

Magazine fans are located approximately 50 metres below the ground and exhaust vertically at 5 metres above the ground from 1800 mm diameter circular shaft.


Articulated dump truck (ADT) movements

Both ore haulage and waste haulage will occur: Ore haulage:

1 x ADT will travel between the tunnel and the surge bin.

Waste haulage:

1 x ADT will travel between the tunnel and top of the IML.

Each ADT will travel at 10 km/hr.

Each ADT will remain at the unloading point (surge bin / top of IML) for 1 minute allowing for positioning and unloading.

ROM bin and conveyer

Conveyers are push-button or equivalent operation rather than continuous operation with conveyer drives located at the head of each conveyer.

Assumed the following during the 15-minute period:

Ore dropping into surge bin for 15 seconds.

(1)

Conveyer AF2 and CV1 will each operate for 3 minutes.

Integrated tool carrier (IT) movements

IT will travel between the tunnel and the workshop.

IT will travel at 10 km/hr and idle at the workshop for 5 minutes.

Cement mixing truck movements

Cement truck will travel between the tunnel and the batching plant.

Cement truck will travel at 10 km/hr and idle at batching plant for 5 minutes for loading.


2 x light vehicles idling

Air compressor


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14


Structures The following structures with dimensions and construction as specified in Section 4.1.5.

Workshop

Batching Plant

Sheds for Raw Water Pump

Water Processing Plant Shed

Wash-down Pad Pump Shed


Daytime Operation Only

Haul truck movements 2x Haul trucks will each enter site, drive to the loading point and exit site.

Each haul truck will travel at 15 km/hr and idle at the loading point for 2 minutes allowing for loading. One haul truck will idle for an additional 2 minutes waiting for first truck.

Additional conveyer and bin operation

Conveyers are push-button or equivalent operation rather than continuous operation with conveyer drives located at the head of each conveyer.

Assumed the following during the 15-minute period:

Bin 3 and 4 each loading ore into trailers for 10 seconds per trailer.

Conveyer AF3 and CV2 will each operate for 3 minutes.

Delivery truck Delivery truck will travel between site entry and the workshop.

Delivery truck will travel at 15 km/hr and idle at workshop/ amenities area for 5 minutes.

Front end loader Front end loader with low sound package located centrally on top of IML.



Forklift at workshop

Water truck at laydown area


Notes:

1. Based on 12 second raise time for Volvo A40E ADT.

4.4 Sound power levels

Sound power levels used in the acoustic model, prior to the application of any duration adjustments have been provided in Appendix A.

The sound power levels are based on:

AECOM’s internal noise level database, and

Manufacturer’s data for equipment where available.

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15

5.0 Predicted noise levels

Results of noise modelling for the project site have been produced for all the noise sensitive receivers outlined in Section 2.0.

Detailed results have been included in Appendix B and noise contour maps are included in Appendix C.

5.1 Assessment of annoying characteristics

As outlined in Section 3.2, the Noise EPP applies noise character adjustments where the noise source contains modulation, tonal, impulsive or low-frequency characteristics. From the proposed plant and operations on site, we are of the opinion that there is the potential for impulsive, tonality and amplitude modulation characteristics to be associated with the mine site. All characteristics and the potential for them to occur are discussed below.

Impulsive

The impulsive characteristic is likely to be associated with ore dropping into the surge bin, and during the day time loading ore into haul trucks. Without acoustic treatment of these noise sources, impulsive noise may be an annoying characteristic of the mine site during operation.

Tonal

Tonal reversing alarms are a common annoyance issue for the community. It is proposed to use broadband reversing alarms for all mobile plant that are regularly used on site. Therefore, we do not believe that tonality will be an annoying characteristic of the mine site during either mine development or mine operation.

Amplitude Modulation

Given that the smallest distance between the articulated dump truck routes and nearest noise sensitive receiver is 200 metres, the likelihood of a significant time varying signal is low. This situation is further improved by the number of plant and equipment operating on site; therefore the resultant environmental noise level at the receivers is expected to be fairly constant under stable atmospheric conditions. As such, we do not believe that amplitude modulation will be an annoying characteristic of the mine site.

Therefore, based on the above we believe it is appropriate to apply an impulsive noise character penalty for day time and night time mine operation in accordance with the Noise EPP.

5.2 Mine development

Modelling indicates that without mitigation there would potentially be a slight exceedance of the applicable noise criteria at one receiver location for the day time model. The amount by which the noise criteria is exceeded is 1 dB(A) and the predicted noise levels at this location were controlled by the raise borer.

During the night time period, noise from the mine development phase will comply with the applicable noise criteria at all of the modelled noise sensitive receivers. The main contributors to the predicted noise levels were noise from the mine development fan and the concrete batching plant.

Table 8 presents the predicted noise level at the most affected receiver for each time period and whether it complies with the Noise EPP noise limits. Results of noise predictions for all receivers during mine development are shown in Table 16 and Table 19 in Appendix B.

Table 8 Mine development highest predicted levels

Time Period Receiver Predicted noise level, LAeq dB(A)

Criteria level, LAeq dB(A)

Complies

Day time R3 53 52 No

Night time R12 45 45 Yes

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16

5.3 Operation

Modelling indicates that without mitigation there would potentially be an exceedance of the applicable noise criteria during the mine operation phase for both day time and night time models. During the day time the main contributors to the predicted noise levels were noise from haul trucks and delivery trucks on site. During the night time the main contributors to the predicted noise levels were noise from articulated dump trucks unloading on the IML, and the primary ventilation shaft. For both the day time and night time operation the +5 dB(A) impulsive noise character penalty contributed to the predicted exceedance of the noise criteria.

Table 9 presents the predicted noise levels at the most affected receiver for each time period and whether it complies with the Noise EPP noise limits. Results of noise predictions for all receivers during mine site operations are shown in Table 20 and Table 21 in Appendix B.

Table 9 Operation highest predicted levels

Time Period Receiver Predicted noise level, LAeq dB(A)

Criteria level, LAeq dB(A)

Complies

Day time R3 56(1)

52 No

Night time R12 49(1)

45 No

Note:

1. +5 dB(A) added to the predicted noise level for impulsive noise characteristics from ore dropping into the surge bin and ore

loading ore into haul trucks.

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17

6.0 Conceptual noise mitigation

Exceedances of the noise criteria are predicted for a small number of receivers surrounding the mine site during mine development. Given this, it is therefore a requirement of the Noise EPP that all reasonable and practicable noise mitigation and/or management measures are investigated.

Mitigation can be implemented in three key areas and preferably in the following order of priority:

Control of noise at the source (including operational management),

Noise shielding within the propagation path, or

Control of noise at the receiver.

We have explored the effect of installing silencers on the ventilation fans, constructing enclosures around noisy plant and discussed the operational changes and other offsite measures that could be adopted to further reduce the received noise levels.

6.1 Acoustic screening

Section 5.0 indicates that during mine development, the raise borer excavating at the magazine shaft is predicted to be the controlling source of noise at the non-compliant receiver.

We understand that it is not feasible to prescribe acoustic treatment directly to the raise borer equipment. Therefore, we recommend that temporary screening be installed while the raise borer is in use. The following sections analyse the required shielding for the raise borer excavating the magazine shaft, the primary ventilation shaft and the escape-way raise.

6.1.1 Mine development – Raise borer at magazine shaft

The mine development scenario was remodelled with a 2.9 m high acoustically solid fence (or one 40 foot shipping container) placed at the western face of the magazine shaft cut-out.

No exceedances of the noise criteria were predicted with the installation of this noise barrier. Table 10 shows the reduced noise levels at the most affected receivers. Results for all predicted receivers are included in Table 16 in Appendix B.

Table 10 Mine development - Raise borer at magazine shaft - with noise barrier

Receiver Predicted noise level,

LAeq dB(A) Criteria level,

LAeq dB(A) Difference, dB(A)

R3 50 52 -2

R12 50 52 -2

R18 48 52 -4

6.1.2 Mine development – Raise borer at primary ventilation shaft

The raise borer will also need to excavate at the primary ventilation shaft. When the raise borer is modelled at the primary ventilation shaft a noise level of 61 dB(A) was predicted at the nearest noise sensitive receiver. Therefore, this scenario was remodelled with a temporary noise barrier constructed from shipping containers (minimum 2 x 40 foot shipping containers high), placed immediately to the east of the primary ventilation shaft.

No exceedances of the noise criteria were predicted with the installation of this noise barrier. Table 11 shows the reduced noise levels at the most affected receivers. Results for all predicted receivers are included in Table 17 in Appendix B.

Table 11 Mine development - Raise borer at primary ventilation shaft - with noise barrier




R3 51 52 -1

R12 51 52 -1

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18




R18 49 52 -3

6.1.3 Mine development – Raise borer at underground escape-way raise

The raise borer will also need to excavate the underground escape-way raise. When the raise borer is modelled at the underground escape way raise a noise level of 60 dB(A) was predicted at the nearest noise sensitive receiver. Therefore, this scenario was remodelled with two temporary noise barriers on either side of the raise borer, one to the north-east and the other to the south-west. Each noise barrier was modelled as constructed from shipping containers (minimum 2 x 40 foot shipping containers high).

No exceedances of the noise criteria were predicted with the installation of these noise barriers. Table 12 shows the reduced noise levels at the most affected receivers. Results for all predicted receivers are included in Table 18 in Appendix B.

Table 12 Mine development - Raise borer at underground escape-way raise - with noise barrier




R12 51 52 -1

R3 49 52 -3

6.2 Treatment of Impulsive Noise Sources

Section 5.0 indicates that during mine operation, noise from unloading ore into the surge bin and ore loading into haul trucks required a +5 dB(A) impulsive noise character adjustment. This impulsive adjustment contributed to an exceedance of the noise criteria during both the day time and night time during operation. Therefore, acoustic enclosures are proposed for the ore unloading point and the haul truck ore loading point to treat these impulsive noise sources.

6.2.1 ROM bin and conveyer system

We recommend that a shed be constructed around the truck unloading point, surge bin, and apron feeder conveyer with an opening for the articulated dump truck. The shed shall have a Colorbond or equivalent construction which is internally lined with an exposed foil faced perforated insulation or building blanket (e.g. Fletcher Insulation Pink Noise Stop insulation or similar).

To reduce impulsive noise from loading ore into haul trucks, we recommend that an open ended shed constructed from Colorbond or equivalent is constructed around the haul truck ore loading area.

6.2.2 Predicted noise levels

The operational day time and night time scenarios were remodelled with the acoustic enclosures detailed above. No exceedance of the noise criteria were predicted with the installation of these acoustic enclosures. Table 13 provides the predicted noise level before and after treatment at the most affected day time and night time receivers. Results for all predicted receivers are included in Table 20 and Table 21 in Appendix B.

Table 13 Mine operation – With acoustic enclosures to treat impulsive noise sources

Receiver Time Period Criteria Level,

dB(A)

Predicted noise level - with treatment of impulsive

noise sources LAeq dB(A)

Complies

R12 Day time 52 51 Yes

R3 Night time 45 44 Yes

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19

6.3 Noise mitigation summary

Conceptual noise mitigation has been recommended for the mine development scenario during the day time. As the noise level was controlled by the raise borer, temporary noise barriers have been recommended for the three locations where the raise borer will be located to excavate shafts.

In addition, noise mitigation has been recommended for the mine operation scenario to reduce noise from impulsive noise sources during the day time and night time. As impulsive noise characteristics were identified from ore dropping into the surge bin and ore loading into haul trucks the recommended treatment was providing acoustic enclosures around these two locations. With the recommended treatment no exceedances of the applicable noise criteria were predicted.

7.0 Construction noise

Typical plant that may be used during construction and the noise levels emitted by each of these are presented in Table 14 (an excerpt of typical construction equipment from DPTI Environmental Instruction EI 21.7

1).

It should be noted that the predicted noise levels are conservative, as they assume that the equipment is operating continually (i.e. no shut-down or idling time), and no shielding provided by structures or topography is incorporated.

1 Management of Noise and Vibration: Construction and Maintenance Activities – Environmental Instruction 21.7

AECOM





1

Table 14 Typical noise levels from construction activities (excerpt of typical plant from DPTI EI 21.7)

Equipment Sound Pressure Level, Leq, 15min dB(A) Sound Pressure Level, Lmax dB(A)

7m 20m 50m 100m 200m 7m 20m 50m 100m 200m

Bobcat (skid-steer loader) 85 76 68 62 56

Bulldozer (large) 92 83 75 69 63 95 86 78 72 66

Bulldozer (small) 90 81 73 67 61 93 84 76 70 64

Compactor 88 79 71 65 59

Compressor (silenced) 76 67 59 53 67

Concrete truck 84 75 67 61 55 85 76 68 62 56

Concrete vibrator 78 69 61 55 49 80 71 63 57 51

Delivery truck 83 74 66 60 54 88 79 71 65 59

Tracked excavator (5t) 77 68 60 54 48

Tracked excavator (45t) 83 74 66 60 54 90 81 73 67 61

Forklift 81 72 64 58 52

Front end loader 88 79 71 65 59 90 81 73 67 61

Generator 78 69 61 55 49 81 72 64 58 52

Grader 85 76 68 62 56 90 81 73 67 61

Hand tools (electric) 77 68

Hand tools (pneumatic) 91 82

Hand-held vibrating compactor 83 74 66 60 54

Jackhammer 96 87 79 73 67

Loader moving with full bucket 76 67 59 53 47 70

Mobile crane 88 79 71 65 59 91 82 74 68 62

Movable lighting 60 60

Road truck 83 74 66 60 54 88 79 71 65 59

Roller 82 73 65 59 53 88 79 71 65 59

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2

Equipment Sound Pressure Level, Leq, 15min dB(A) Sound Pressure Level, Lmax dB(A)

7m 20m 50m 100m 200m 7m 20m 50m 100m 200m

Scraper 85 76 68 62 56 98 89 81 75 69

Vac-truck 92 83 75 69 63

Vibratory roller 84 75 67 61 55 85 76 68 62 56

Water cart 82 73 65 59 53 83 74 66 60 54

Welding equipment 80 71 63 57 51 85 76 68 62 56

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1

8.0 Conclusion

This report has assessed the effect of construction and operational noise from the Bird in Hand mine facility upon the neighbouring residences.

In summary, noise modelling has demonstrated that operations at the mine site are predicted to meet the requirements of the relevant noise criteria with the implementation of the proposed noise mitigation measures.

AECOM





Appendix A

Source sound power level spectra

AECOM





A-1

Appendix A Source sound power level spectra

The equipment selections listed below are indicative only and therefore may not be the exact model used on site. Where equipment selections have not been listed, generic sound power levels have been provided.

Table 15 Noise source sound power levels

Item

Sound Power Level (dB) at Octave Band Centre Frequency (Hz)

63 125 250 500 1k 2k 4k 8k Overall (dB(A))

Magazine Fan (Outlet)(1) 87 89 85 88 83 83 78 93 88

Road Truck (B-double)(2) 113 110 104 105 110 107 101 113

Road Truck Idling 96 88 84 90 89 85 80 93

Delivery Truck 110 107 101 102 107 104 98 110

Delivery Truck Idling 93 85 81 87 86 82 77 90

Front End Loader (CAT 966K with low noise package)

115 114 110 105 102 100 94 108

ADT (Volvo A40E) 107 107 105 98 100 99 93 - 112

IT Carrier (Volvo L120) 108 109 105 102 99 97 92 - 113

Forklift 82 88 91 95 99 97 92 - 103

Water Truck 101 102 96 100 94 95 91 101

Cement Mixer Truck 108 101 99 100 99 101 93 87 105

Cement Mixer Truck Idling

101 91 86 93 93 88 83 96

Toyota LV 103 100

Conveyer Drive 83 86 87 88 89

Conveyer Line Source (per metre)

56 60 63 73 68 65 56 73

Dump into ROM BIN 110 110 107 104 102 99 95 86 107

Air Compressor(3)

79 76

Workshop SPL(4)

67 79 69 72 74 69 69 67 78

Batching Plant 104 109 112 107 104 102 96 110

1 x Pump (50kW)(5)

81 83 85 84 88 85 81 91

2 x Pump (50kW)(6)

84 86 88 87 91 88 84 94

Drill rig (surface / services / longhole)

(7) 102 103 100 100 101 102 102 108

Raise Borer(8)

110 111 109 108 110 111 111 117

Notes:

1. Fantech AP16010DP9/25.

AECOM





A-2

2. It is intended to use a smaller 32 tonne truck and trailer combination, modelling has been undertaken with the larger

B-double as a worst case noise modelling scenario.

3. CompAir L160.

4. Sound Pressure Level not a Sound Power Level.

5. Used for raw water pump and water treatment plant

6. Used for wash-down pad pump

7. Ditch Witch JT60 Directional Drill.

8. Atlas Copco L9 Jumbo Drill. Based on advice by Terramin, these units are typically louder than a raise borer and

therefore this is a conservative modelling approach.

AECOM





Appendix B

Predicted noise levels

AECOM





B-1

Appendix B Predicted noise levels

Mine development – day time – raise borer at magazine shaft

Table 16 Mine Development - day time – raise borer at magazine shaft - modelling results

Receiver Criteria level,

LAeq dB(A)

No acoustic screening With acoustic screening

Predicted noise level, LAeqdB(A)

Exceedance, dB(A)


Exceedance, dB(A)

R1 52 42 - 42 -

R2 52 47 - 46 -

R3 52 53 +1 50 -

R4 52 46 - 46 -

R5 52 44 - 44 -

R6 52 36 - 37 -

R7 52 34 - 34 -

R8 52 43 - 44 -

R9 52 44 - 44 -

R10 52 34 - 34 -

R11 52 31 - 31 -

R12 52 50 - 50 -

R13 52 38 - 38 -

R14 52 39 - 39 -

R15 52 37 - 37 -

R16 52 35 - 36 -

R17(1) 52 48 - 46 -

R18(1) 52 48 - 48 -

Note:

1. Daytime receiver only.

AECOM





B-2

Mine development – day time – raise borer at primary ventilation shaft

Table 17 Mine Development - day time – raise borer at primary ventilation shaft - modelling results


LAeq dB(A)



Exceedance, dB(A)


Exceedance, dB(A)

R1 52 43 - 44 -

R2 52 46 - 48 -

R3 52 50 - 51 -

R4 52 41 - 41 -

R5 52 43 - 43 -

R6 52 35 - 35 -

R7 52 34 - 34 -

R8 52 45 - 40 -

R9 52 46 - 41 -

R10 52 33 - 30 -

R11 52 38 - 32 -

R12 52 61 +9 50 -

R13 52 39 - 39 -

R14 52 40 - 40 -

R15 52 43 - 43 -

R16 52 42 - 42 -

R17(1) 52 47 - 49 -

R18(1) 52 49 - 49 -

Note:


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B-3

Mine development – day time – raise borer at underground escape way raise

Table 18 Mine Development - day time – raise borer at underground escape way raise - modelling results


LAeq dB(A)



Exceedance, dB(A)


Exceedance, dB(A)

R1 52 42 - 42 -

R2 52 46 - 45 -

R3 52 49 - 49 -

R4 52 44 - 44 -

R5 52 42 - 42 -

R6 52 38 - 38 -

R7 52 39 - 39 -

R8 52 44 - 43 -

R9 52 46 - 45 -

R10 52 35 - 30 -

R11 52 49 - 34 -

R12 52 60 +8 51 -

R13 52 55 +3 46 -

R14 52 50 - 45 -

R15 52 44 - 42 -

R16 52 42 - 40 -

R17(1) 52 46 - 46 -

R18(1) 52 47 - 47 -

Note:


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B-4

Mine development – night time

Table 19 Mine Development – night time - modelling results

Receiver Criteria level, LAeq

dB(A) Predicted noise level,

LAeqdB(A) Exceedance, dB(A)

R1 45 36 -

R2 45 39 -

R3 45 43 -

R4 45 34 -

R5 45 35 -

R6 45 27 -

R7 45 26 -

R8 45 37 -

R9 45 38 -

R10 45 28 -

R11 45 29 -

R12 45 45 -

R13 45 33 -

R14 45 35 -

R15 45 33 -

R16 45 31 -

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B-5

Mine operation – day time

Table 20 Operation- day time - modelling results


LAeq dB(A)

With no acoustic treatment With acoustic enclosures to

treat impulsive noise sources

Predicted noise level, LAeq dB(A)

Exceedance, dB(A)

Predicted noise level, LAeq dB(A)

Exceedance, dB(A)

R1 52 46(2)

- 41 -

R2 52 50(2)

- 45 -

R3 52 56(2)

+4 51 -

R4 52 51(2)

- 45 -

R5 52 47(2)

- 42 -

R6 52 46(2)

- 41 -

R7 52 42(2)

- 37 -

R8 52 46(2)

- 41 -

R9 52 47(2)

- 42 -

R10 52 39(2)

- 33 -

R11 52 45(2)

- 40 -

R12 52 56(2)

+4 51 -

R13 52 48(2)

- 43 -

R14 52 50(2)

- 45 -

R15 52 47(2)

- 42 -

R16 52 44(2)

- 39 -

R17(1) 52 51

(2) - 46 -

R18(1) 52 51

(2) - 46 -

Note:


2. +5 dB(A) penalty for impulsive noise characteristic from ore unloading into surge bin and ore loading into haul truck.

AECOM





B-6

Mine operation – night time

Table 21 Operation - night time - modelling results


LAeq dB(A)

With no acoustic treatment With acoustic enclosures to

treat impulsive noise sources


Exceedance, dB(A)


Exceedance, dB(A)

R1 45 40(1)

- 35 -

R2 45 43(1)

- 38 -

R3 45 47(1)

+2 41 -

R4 45 40(1)

- 35 -

R5 45 39(1)

- 34 -

R6 45 33(1)

- 28 -

R7 45 32(1)

- 27 -

R8 45 41(1)

- 36 -

R9 45 42(1)

- 37 -

R10 45 32(1)

- 26 -

R11 45 37(1)

- 31 -

R12 45 49(1)

+4 44 -

R13 45 40(1)

- 35 -

R14 45 42(1)

- 36 -

R15 45 40(1)

- 34 -

R16 45 40(1)

- 32 -

Note: 1. +5 dB(A) penalty for impulsive noise characteristic from ore unloading into surge bin.

AECOM





Appendix C

Noise contour plots

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www.aecom.com

PROJECT ID


60535016NRNR 17 MAY 2017

LEGEND! Noise sensitive receivers!. Raised Borer


Predicted Noise Levels, Leq, 15min

52-55 dB(A)55-58 dB(A)58-61 dB(A)

61-64 dB(A)64-67 dB(A)67-70 dB(A)>70 dB(A)




4Figure


DAYTIME MINE DEVELOPMENT NOISECONTOUR MAP - WITH MITIGATION TOCOMPLY WITH NOISE EPP

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PROJECT ID


60535016NRNR 17 MAY 2017

LEGEND! Noise sensitive receivers


Predicted Noise Levels,Leq, 15 min

45-48 dB(A)48-51 dB(A)

51-54 dB(A)54-57 dB(A)57-60 dB(A)>60 dB(A)




5Figure


NIGHT TIME MINE DEVELOPMENT NOISECONTOUR MAP - WITH MITIGATION TOCOMPLY WITH NOISE EPP

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PROJECT ID


60535016NRNR 30 MAY 2017

LEGEND! Noise sensitive receivers!. Ventilation Shafts


Predicted Noise Levels,Leq, 15min

52-55 dB(A)55-58 dB(A)58-61 dB(A)

61-64 dB(A)64-67 dB(A)67-70 dB(A)>70 dB(A)




6Figure


DAYTIME OPERATIONAL NOISECONTOUR MAP - WITH MITIGATION TOCOMPLY WITH NOISE EPP

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PROJECT ID


60535016NRNR 30 MAY 2017

LEGEND! Night-time receivers!. Ventilation Shafts


Predicted Noise Levels, Leq, 15min

45-48 dB(A)48-51 dB(A)

51-54 dB(A)54-57 dB(A)57-60 dB(A)>60 dB(A)




7Figure


NIGHT-TIME OPERATIONAL NOISECONTOUR MAP - WITH MITIGATION TOCOMPLY WITH NOISE EPP

bird in hand gold mine - terramin.com.au · raise borer was modelled excavating at three separate...

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