BBA-PLN-1000-1400-0021-B-00 Blast Management …gunnspulpmill.com.au/...1000-1400-0021-B-00_Blast_Management_Plan.pdfBBA-PLN-1000-1400-0021-B-00 Blast Management Plan 1 of 5 BELL BAY

BBA-PLN-1000-1400-0021-B-00 Blast Management Plan 1 of 5

BELL BAY PULP MILL MANAGEMENT PLAN

Revision Date Revision Description Prepared Reviewed Approved

Draft 01 17 March 2008 Initial Draft Orica/JRD

Draft 02 27 March 2008 Final Draft Orica/JRD JD CF

A0 4 April 2008 Submitted for DEPHA approval Orica/JRD JD CF

B0 7 April 2008 Revised following DEPHA comment Orica/JRD JD CF

BBA reference number of this document: BBA-PLN-1000-1400-0021-A-00

Plan: Blast Management Plan Purpose: Blasting activities have the potential to result in damage to property, injury or death to

person(s) and damage to the environment. Blasting activities may produce noise, blast overpressure, vibration and dust emissions which may adversely impact the nearest residential areas. This plan details how blasting activities will be managed at the Pulp Mill Site to ensure compliance with the Pulp Mill Permit conditions. This plan does not cover the management of blasting associated with water supply construction and wastewater pipeline construction and underwater blasting associated with the ocean outfall.

Objectives: The objectives of the Blast Management Plan are to detail management and mitigation measures that ensure that blasting activities; • do not result in air blast overpressure and ground vibration that exceeds permit guidelines; • do not damage property, infrastructure or historical heritage sites; and • do not cause injury or death to person(s).

Project phase(s): Construction x Commissioning Operations

Summary of Blast Management Measures

1. Blasting will be carried out in accordance with this Blast Management Plan, which satisfies the requirements of Pulp Mill Permit.

2. Blasts will be designed to not exceed the permitted overpressure and vibration limits.

3. Modelling has been undertaken to verify that Pulp Mill Permit limits associated with air blast over pressure and vibration will not be exceeded.

4. Monitoring of air blast over pressure and vibration will be undertaken to verify that the effects of blasting activities are within the specified limits.

5. At the cessation of each blasting event the Site Environmental Officer will examine the blasting records. A blast report will be produced for each blast.

6. If the specified limits in relation to air blast over pressure, vibration, noise and dust have been exceeded, further blasting in the area shall not recommence until a review of the blast records and model has been undertaken by a suitably qualified person, and a revised blast procedure has been produced.

Management Plan


APPLICABLE PERMIT CONDITIONS

Schedule Part Section Number Page

Permit condition

LU1 3 2 2NC 4.1 84 of 201 (Seq. 97)

Permit wording Prior to the commencement of blasting activities on the pulp mill site, or by a date specified in writing by the Director, a Blast Management Plan in relation to the pulp mill site must be submitted to the Director for approval.


Permit condition

LU 1 3 2 2NC 4.2 84 of 201 (Seq. 97)

Permit wording The plan must be prepared in accordance with the requirements contained in Appendix A of Australian Standard AS 2187.2-2006, and any guidelines provided by the Director.


Permit condition

LU 1 3 2 2NC 4.3 84 of 201 (Seq. 97)

Permit wording

The plan must include, but is not limited to, details of the following: (a) the proposed blasting regime; (b) results of modelling of vibration and blast overpressure, undertaken by a suitably qualified person; (c) mitigation and management measures for the reduction of impacts from blasting activities; (d) a table containing all of the major commitments made in the plan; (e) an implementation timetable for key aspects of the plan; and (f) a reporting program to regularly advise the Director of the results of the plan.


Permit condition

LU 1 3 2 2NC 4.4 84 of 201 (Seq. 97)

Permit wording Blasting activities must not take place unless the plan has been approved in writing by the Director.


Permit condition

LU 1 3 2 2NC 4.5 85 of 201 (Seq. 98)

Permit wording The approved plan, as amended from time to time with the approval of the Director, must be implemented to the satisfaction of the Director.


APPLICABLE PERMIT CONDITIONS


Permit condition

LU 1 3 2 2NC 4.6 85 of 201 (Seq. 98)

Permit wording The plan must be made publicly available.


Permit condition

LU 1 3 2 2NC 5.1 85 of 201 (Seq. 98)

Permit wording

Blasting in relation to the pulp mill activity and the quarry activity must be carried out in accordance with blasting best practice environmental management principles, and must be carried out such that, when measured at the nearest noise sensitive premises, air blast and ground vibration comply with the following guidelines: (a) for 95% of blasts, air blast over pressure must not exceed 115dB (Lin Peak); (b) air blast over pressure must not exceed 120dB (Lin Peak); (c) for 95% of blasts ground vibration must not exceed 5mm/sec peak particle velocity; and (d) ground vibration must not exceed 10mm/sec peak particle velocity.


Permit condition

LU 1 3 2 2NC 6.1 85 of 201 (Seq. 98)

Permit wording

All measurements of airblast overpressure and peak particle velocity must be carried out in accordance with the methods set down in the document Technical basis for guidelines to minimise annoyance due to blasting overpressure and ground vibration, Australian and New Zealand Environment Council, September 1990.


MANAGEMENT MEASURES

Component Blast Management Plan

LU1 Part 3 Section 2 2NC4.2

2NC4.3 a) to c) 2NC 5.1 2NC 6.1

Refer to the Appendix1: Blast Management Plan – Bell Bay Alliance, produce by Orica Mining Services. Orica have been appointed to provide specialist blast design and management services.

The appended document and its appendices detail the proposed blasting regime, results of modelling of vibration and blast overpressure, and mitigation and management measures for reduction of impacts from blasting activities.

The plan is in accordance with the requirements contained in Appendix A of Australian Standard AS 2187.2-2006.

Mitigation and management measures are designed to meet the permitted vibration and overpressure limits of:

(a) for 95% of blasts, air blast over pressure must not exceed 115dB (Lin Peak); (b) air blast over pressure must not exceed 120dB (Lin Peak); (c) for 95% of blasts ground vibration must not exceed 5mm/sec peak particle velocity; and

(d) ground vibration must not exceed 10mm/sec peak particle velocity.

Component Summary of commitments, implementation timetable an d reporting program

Activity Installation/Start Frequency Reporting

Air blast over pressure and

vibration monitoring

Establish monitoring points prior to

commencement of blasting.

Monitor each blast‘s overpressure and

vibration at 2 points on or near the mill site in addition to one at the

closest sensitive residence in Rowella.

BBA to submit blast report within 24 hours of each blast to Gunns

and DEPHA

Dust monitoring Refer to the following documents; GNS-MON-1000-1400-0001 Dust web cam GNS-PLN-1000-1400-0001 Dust management plan

Noise monitoring Refer to the following document; BBA-PLN-1000-1400-0007 Noise Management Plan Bulk Earthworks Mill and Wharf

Public complaints due to blasting.

Commencement of blasting As required

Confirmed complaint due to effects of

blasting will trigger immediate incident

report, within 24 hrs, to Gunns and DEPHA

Potential permit breach or

environmental harm

Commencement of blasting

As required, if permitted overpressure or vibration limits are

exceeded.

Incident report to Gunns and DEPHA

LU1 Part 3 Section 2

2NC4.3 d) to f)

Public Notification of Blasting Operations

Advertise blast schedule in local

newspaper at on least two consecutive Saturdays before commencement.

Each new continuous period of blasting

operations. N/A


Appendix 1: Blasting Management Plan – Bell Bay All iance (Orica)

Blasting Management Plan – Bell Bay Alliance

By Kim Henley

Technical Services Manager – Quarrying & Construction

Orica Mining Services

28 February 2008

Page 2 of 19

CONTENTS

Description of Blasting ..................................................... 3 Plant Area Blasting ..........................................................................................................................3 Access Road and Wharf Area Blasting............................................................................................3 Bench Preparation ............................................................................................................................4

Environmental Impacts from Blasting............................. 4 Noise from Drilling..........................................................................................................................4 Dust from Blasting Operations ........................................................................................................5 Airblast and Vibration......................................................................................................................5

Airblast........................................................................................................................................5 Control of Airblast ...................................................................................................................6 Modelling of Airblast...............................................................................................................6

Vibration .....................................................................................................................................7 Controlling Vibration...............................................................................................................8 Modelling Vibration.................................................................................................................8

Flyrock ......................................................................................................................................10

Environmental Monitoring .............................................. 11

Blasting Operations ........................................................ 12 Sleeping of blasts ...........................................................................................................................12 Notifications...................................................................................................................................12 Blast Reporting ..............................................................................................................................13 Notification of Contractors ............................................................................................................13 Site Access .....................................................................................................................................13

Appendices ...................................................................... 14 Appendix 1 - Blast Vibration and Airblast Modelling Results .....................................................14 Appendix 2 - Vibration and Airblast Contour Maps.....................................................................15 Appendix 3 - Australian Standards Suggestions for the content of a Blast Management Plan ....16 Appendix 4 - Typical Blast Report; ..............................................................................................19

Page 3 of 19

Description of Blasting The pulp mill site will require blasting to achieve Final Excavation Level in two main areas; the Main Plant Area, and the Wharf Access Road and dock-side area. In the Main Plant Area, blasting is required down to a maximum depth of 6m, while in the Access Road and dock area, blasting to a depth of up to 16m is likely. Three plans showing the environmental impact of blasting at the site have been prepared as part of this Blast Management Plan, which indicate the area where blasting will occur, at the centre of the concentric circles indicating the modelled airblast and vibration contours.

Plant Area Blasting Blasting in this area will be typified by ‘shallow’ blasting, where the depth of blastholes is not significantly greater than the distance between blastholes. Good control of blasting operations will ensure that this type of blast does not generate flyrock and airblast.

To effectively blast the dolerite rock in the plant area will require blastholes with depths ranging from approximately 3m to a maximum of 5.5 m. Depth of blasting in areas defined as underground service corridors will need to be increased by up to 2 m. Distance between blastholes range between 2.0 m and 2.6 m.

Access Road and Wharf Area Blasting Blasting along the access road will vary from ‘shallow’ blasting to a more typical bench configuration, where the hole depth is several times the distance between the blastholes. In shallow holes, vertical flyrock and airblast are the greater risks. In a bench configuration, horizontal flyrock and airblast are the major risks that need to be controlled effectively.

Hole depths along the access road will vary from 3 m to 13 m, with distance between blastholes varying from 2.0 m to 3.3 m. In the Wharf Area, holes up to 16 m deep will be required.

The major hazards identified from the supplied drawings are the proximity to powerlines, heritage walls and Federal Reserve Areas. Blasting near the river will require control over access by members of the public. The powerlines are approximately 50 m from the access road to the south of the plant area.

This risk assessment addresses the major issues of control over blasting operations, plus flyrock, airblast and vibration control. The following table gives an overview of typical blasting configuration;

Page 4 of 19

Main Plant Area Wharf Access Road Wharf Area Blast Description Shallow benches

between 3.5 to 6 m high

Benches up to 13 m high can be considered. However, this will depend on the approach chosen by the civil works contractor, who may choose to split this into 2 smaller benches.

Benches up to 16 m high can be considered. However, this will depend on the approach chosen by the civil works contractor, who may choose to split this into 2 smaller benches.

Hole Diameter 89 mm 89 mm 89 mm Burden x Spacing From 2.4 x 2.4m to

3 x 3m 3.5m x 3.5m 3.5m x 3.5m

Typical Charge per hole

From 11kg to 26kg From 85kg to 100 kg Up to approximately 100 kg when blasting 16 m benches.

Maximum Instantaneous Charge

From 33 to 104 kg, depending on location in the plant area.

Up to 350 kg per delay. Maximum of 102kg

Stemming Material

12 mm screened rock

12 mm screened rock 12 mm screened rock

Initial blast parameters have been produced for each area of the construction site. The parameters listed are for the deepest expected blastholes in each area, which will require highest charge weights and would provide geatest vibration and airblast. All vibration and airblast modelling has been based on this worst case. The blast parameters for each area are shown in Appendix 1.

Bench Preparation Good bench preparation contributes strongly to improved quality of blasting because blasting personnel can move around the site easier and with reduced hazard to their personal safety. Benches should be as flat as possible with easy access for bulk explosive manufacturing trucks.

Environmental Impacts from Blasting

The environmental impacts of blasting operations are; � Noise from drilling � Dust from the blasting operation � Airblast generated by the explosion gases venting to atmosphere � Vibration generated by shockwaves travelling through the rock mass � Flyrock caused by poorly designed or poorly controlled blasting operations.

Noise from Drilling Noise from drilling and the operation of machinery also impact on the environment, but noise from these sources has been addressed as part of the main Noise Confirmation Report. Consequently, this will not be addressed as part of the blast management plan.

Page 5 of 19

Dust from Blasting Operations Dust has also been identified as having an impact on the environment, but this issue has been addressed by the Dust Management Plan, so will not be addressed in this risk assessment.

Airblast and Vibration The following assessment of the impact of vibration and airblast is based on theoretical modelling criteria specified by AS 2187.2 – Use of Explosives. To obtain more accurate predictions of blasting impacts, data will need to be collected from the field. This will require an appropriate experimental design and data collection system to measure the airblast and vibration effects of some scaled blasts in the approximate locations of the production blasts. This data can be collected once excavation operations commence on the site. On completion of the field measurements and data interpretation, this Blast Management Plan will be updated with the results, and any changes to blasting operational parameters implemented. A letter will be issued to the Bell Bay Alliance, summarising any necessary changes to site blasting procedures.

Airblast Permit conditions for the project are;

1. for 95% of blasts, air blast over pressure must not exceed 115dB (Lin Peak); 2. air blast over pressure must not exceed 120dB (Lin Peak);

These limits are the same as applied to quarry blasting operations, which comply with Australian Standard AS2187.2 - Use of Explosives. This standard specifies the following limits on vibration;

Page 6 of 19

Control of Airblast

Airblast from blasting can be controlled by ensuring that the explosives have sufficient confinement within the rock mass, to ensure that the explosives’ energy is completely used before the gases vent to the atmosphere. From a practical perspective, this means that careful control needs to be maintained on;

• The burden on front row blastholes • The amount of stemming used in blastholes to confine the gases in the holes. • The rate of movement of the rock mass during the blast

The prevailing wind direction has a significant effect on airblast, generally increasing the level of airblast downwind of the blast. However, as blasting will not occur when the wind is towards the Rowella residence, as an outcome of the Dust Management Plan, wind will not effect airblast levels at the Rowella residence during blasting at the site. Modelling of Airblast The level of airblast expected to be generated by blasting can be calculated, in the first instance, using the equation specified in Australian Standard AS2187.2. This formula to estimate airblast is:

45.1

3

−

=W

RKP

where:

P = estimate of the air overpressure in Pascals K = constant determined by field measurements R=distance from the blast W = charge weight

This formula has been used to model the expected airblast at the sensitive locations around the site. The following areas of concern that have been identified during the risk assessment process;

o Rowella Residence o Current Gunns Mill o East Tamar Highway o Effect on air operations

Figure 1, Appendix 2 shows the airblast contours modelled during this study surronding the construction site. The 110dB(L) and 120 dB(L) contours are shown, and illustrates the minimal impact airblast is likely to have on the environment of the site.

Page 7 of 19

Point of Interest Distance at

Closest Approach of Blasting (m)

Expected Maximum Instantaneous Charge Weight (kg)

Calculated Airblast (dBL)

Rowella Residence 1300 102 103 Current Gunns Mill 370 104 119 East Tamar Highway 490 33 111 Effect on Aircraft Operations

1300 104 103

NOTE: For this document no apporach has been made to Department of Transport regarding clearance distances for aircraft. This calculation has been done as illustrative of the effect on aircraft operation.

Vibration Permit conditions for the project are;

1. for 95% of blasts ground vibration must not exceed 5mm/sec peak particle velocity; and

2. ground vibration must not exceed 10 mm/sec peak particle velocity. These limits are the same as applied to quarry blasting operations, which comply with Australian Standard AS2187.2 - Use of Explosives. This standard specifies the following limits on vibration;

Page 8 of 19

Controlling Vibration The vibration generated by blasting can be controlled using two main methods;

1. Reduce the charge mass of explosives detonating at any instant 2. Ensure that the blast design and initiation design promote forward movement of the

rock mass. The mass of explosives detonating is controlled by using delay detonators. These provide an effective initiation sequence that delays the detonation of the each charge so that all the charges detonate in a controlled sequence, each separated from the other by a few thousandths of a second. Promoting forward movement of the rock mass ensures that charges that fire towards the back of the blast are not confined by many metres of rock in front of the charge. The amount of rock in front of the charge is calculated to reflect the energy of the charge, and ensures that the explosive energy is used to effectively fragment the rock mass, rather than being wasted by generating excessive ground vibration. Modelling Vibration An initial estimate of vibration can be made assuming an ‘average’ rock response, using the equation for estimating vibration from the USBM and AS 2187.2.

Page 9 of 19

6.1−

=W

RKppV

where:

ppV = estimate of the peak particle velocity K = constant determined by field measurements R=distance from the blast W = charge weight

This formula has been used to model the expected vibration at the sensitive locations around the site. The areas of concern that have been identified during the risk assessment process, and the recommended vibration limits from AS2187.2 at these locations are;

• Rowella residence • Gas Pipeline • Telstra Optic Fibre • Powerstation • Heritage – Rock Walls • Powerlines adjacent to the site • East Tamar Highway • Water pipeline

The location of these points of interest and the modelled vibration levels surrounding the site are shown on Figure 2 and Figure 3 in Appendix 2. The wooden powerpoles and transmission towers adjacent to the access road have a very high tolerance to vibration. A typical vibration limit specified by Transgrid in NSW is 50 mm/s measured at the base of the transmission towers. Measurement by Richards and Moore (Effects of Blasting on Infrastructure, Explo 2007, pp 45-50), showed that even at 140 mm/s, the measured strain at the foundations was less than 47 microstrain, which is very low, and was not affecting the tower foundations. No amplification occurred in the tower structure. For wooden power poles, an input vibration of 63.9 mm/s resulted in vibration at the base of the pole of 52.4 mm/s, and 6 m above ground, vibration was 61.3 mm/s. On the same pole, vibration due to light wind conditions was measured at 25 mm/s.

Page 10 of 19

Point of Interest Distance at

Closest Approach of Blasting (m)

Expected Maximum Instantaneous Charge Weight (kg)

Vibration Limit from Aust. Standard 2187.2 or Pulp Mill Permit (whichever is lower)

Calculated Vibration (mm/s)

Rowella residence 1300 102 10 0.5 Gas Pipeline 391 102 No standard –

Typically 50 mm/s is accepted

3.3

Telstra Optic Fibre 140 38 No standard – Typically 100 mm/s is accepted

7.7

Powerstation 840 102 25 1.0 Heritage – Rock Walls

60 102 No standard – Typically 100 mm/s is accepted

66

Powerlines adjacent to the site


98.1

East Tamar Highway


0.9

Water pipeline 635 104 No standard – Typically 50 mm/s is accepted

1.5

Flyrock

Flyrock from blasting operations has the greatest potential impact on the environment, but affects only a very small area immediately surrounding the blast. The risk assessment process raised the following issues as potential risks;

i) Damage to Infrastructure

(1) Site Offices The proposed location of the site offices is approximately 30 m from the blast zone in the Main Plant Area. To prevent flyrock and possible airblast damage to the offices, it would be appropriate to conduct all blasting operations in this area, prior to the establishment of the site office. It is possible to blast in very close proximity to established buildings, however, this would require the use of blast mats and extra earth cover over the top of the blast, which will increase the blasting costs substantially.

(2) Gunns Offices (Exisiting) The shortest distance to any of Gunns existing offices is over 400m. Orica uses blast design and execution management methods that ensure structures at this distance from blasting operations are not at risk.

Page 11 of 19

(3) Powerlines The shortest distance the powerline adjacent to the site is approximately 30m. Orica uses blast design and execution management methods that produce minimal flyrock from blasting to ensure the powerline will not be at risk.

ii) Federal Reserve Land

The blasting operations that are closest to Federal Reserve Land will occur during excavation of the Access Road cutting, near the wharf area. Blasting will occur approximately 17m from the federal reserve. To ensure that flyrock is not produced in this area, increased stemming will be required, plus good blasting practises that will ensure that the designed stemming lengths are achieved during charging. The required stemming length is specified in Appendix 1.

iii) East Tamar Highway The highway is approximately 490m from the blasting operations at closeest approach. Orica uses blast design and execution management methods that ensure blasting operations do not produce a hazard from flyrock at this distance.

iv) People on the Powerline Easement To ensure that safety of people who may access the powerline easement from time to time, notices on access gates are required, to inform people of the blasting operations, and provide instructions to ensure their safety.

Environmental Monitoring A permanent monitor has been established by BBA at the Rowella residence. Orica will use two additional monitors to measure vibration and airblast of all blasts at the site;

• One monitor will be located at the nearest sensitive site • One monitor will be located between the blast and the Rowella residence on the Northern

side of the river. Access through the Federal Reserve land may be required to establish this monitor.

• The location of both of these monitors will be recorded as part of the blast reporting process.

Page 12 of 19

Blasting Operations

Sleeping of blasts Occasional delays on the construction site may mean that for operational reasons, a blast might need to be slept overnight and fired the next day. Some reasons for this may include, but not be limited to the following;

• Breakdown of equipment in front of the blast face • Difficulty of access leading to charging delays. • Wind or other meteorological condition that is likely to result in undesirable environmental

outcomes if the blast were to be fired. In these circumstances sleeping of the blast requires a guard to be posted to prevent any unauthorised access to the blast site. The engagement and briefing of a blast guard will follow documented safety procedures. Safety of Operations The safe management and execution of blasting operations is contained wholly in Orica’s Shotfirer Work Instructions, which is a comprehensive document used to control our operations at every site where Orica is responsible for controlling the blasting operation. This document and the associated procedures cover every aspect of the design and control of blasting operations at every level of risk, and has been refined by over 10 years of use in quarrying and construction blasting. Items raised during the Risk Assessment and included in the Shotfirer Work Instructions;

• Clearance distances • Safe Locations for personnel • Operating Procedures – (Orica Shotfirer Work Instructions) • Siren - A centralised siren should be used that is audible across the entire

construction site. • Separation between excavation traffic and blast site – Use of signs and a windrow as

a physical barrier • Explosives TBT to Site Operators • Adequate cover for the shotfirer – A Shotfirer's Bell must be used consisting of a

half culvert pipe.

Notifications Notification of blasting date, time and location are the responsibility of BBA. These notifications will include:

• General Notice via Media • Daily notice to nearby residents • Notification to all employess via Prestart Meeting • Site email • Blasting Sign at site Entrance

Page 13 of 19

Blast Reporting Orica will provide a blast report to BBA on the day of the blast. The report will include all explosives usage and monitoring results. All blasts will be recorded on video, and this will be available to BBA soon after the blast. BBA have undertaken to provide a report to DTAE within 24 hours of the blast. An example of this report has been included as Appendix 4.

Notification of Contractors

To ensure the safety of all contractors accessing the site; i) Signs are required on Gates to notify people accessing the site. ii) People to report to Site Office for Blasting Notification.

Radio Communications i) Orica to be notified of radio channel ii) Specific Radios or channels for Blasting Operations

Site Access All personnel and vehicles accessing the site will comply with site access procedures and induction requirements. Personnel will require;

• Photo ID • Sticker for Helmet • Project Induction

All vehicles accessing the site will need to be issues with a permit by BBA. Vehicles will have to be washed down prior to and after accessing the site. These specific requirements will be notified to Orica by BBA

Page 14 of 19

Appendices Appendix 1 - Blast Vibration and Airblast Modelling Results

Location POI Hazard Distance

(m) MIC (kg)

Predicted Vib

(mm/s)

Predicted Airblast dB(L)

Vib Limit (mm/s)

Airblast Limit

(dB(L)

Min. Front Row

Burden (m)

Stemming (m)

Bench Height

(m) Wharf Area Rock Walls to NW Vibration/Flyrock 60 102.3 66.0 142 100 3.2 2.8 16 Wharf Area Rowella Residence Vibration/Airblast 1300 102.3 0.5 103 10 120 3.2 2.8 16 Wharf Area Gas Pipeline Vibration 391 102.3 3.3 118 50 3.2 2.8 16 Wharf Area Power Station Vibration 840 102.3 1.0 109 1 3.2 2.8 16 Wharf Area Federal Reserve Flyrock 25 100.8 3.2 3 16 Road Cutting Rock Walls to NW & SE Vibration/Flyrock 207 358.3 24.8 131 50 3 2.5 14 Road Cutting Rowella Residence Vibration/Airblast 1300 349.4 1.3 108 10 120 3 2.8 14 Road Cutting Federal Reserve - Ch 140m Flyrock 17 343.4 3 3 14 Main Plant Access Road Powerlines Vibration/Flyrock 30 38.1 90.8 146 100 3.2 2.8 4 Main Plant Access Road Rowella Residence Vibration/Airblast 1900 38.1 0.1 94 10 120 3.2 2.8 4 Main Plant Access Road East Tamar Hwy Vibration/Flyrock 490 33.6 0.9 111 50 120 3.2 3 4 Main Plant Access Road Telstra fibre Optic Cable Vibration 140 38.1 7.7 127 50 3.2 2.8 4 Main Plant Area Federal Reserve Flyrock 120 104.5 3 2.5 5.5 Main Plant Area Rowella Residence Vibration/Airblast 1900 104.5 0.3 98 10 3 2.5 5.5 Main Plant Area Water Pipeline Vibration 635 104.5 1.5 112 50 3 2.5 5.5 Main Plant Area Present Mill Vibration/Airblast 370 104.5 3.7 119 25 120 3 2.5 5.5 Main Plant Area Site Offices Flyrock 60 89.6 3 3 5.5 Main Plant Area Car Park Flyrock 90 89.6 3 3 5.5 Main Plant Area Telstra fibre Optic Cable Vibration 210 89.6 8.0 125 50 3 3 5.5 Main Plant Area Powerlines Vibration/Flyrock 113 89.6 21.6 133 100 3 3 5.5

Orica Explosives Blasting Risk Assessment COPYRIGHT page 15

Appendix 2 - Vibration and Airblast Contour Maps

Figure 1: Airblast Contours

Figure 2: Vibration Contours

Figure 3: Vibration Contours


Appendix 3 - Australian Standards Suggestions for the content of a Blast Management Plan


A2 BLAST MANAGEMENT PLAN A2.1 Purpose The purpose of the blast management plan is as follows: (a) Detail the objectives for the project or task. (b) Identify risks and hazards associated with the objectives, including control and/or mitigation. (c) Identify site-specific requirements including selection of personnel, training programs and communication systems. (d) Introduce blast as part of the overall task in a planned manner. (e) Control the blast process from design to initiation, evaluation and misfire treatment. (f) Implement a review process to ensure that the objectives are met. (g) Assure compliance with the approval/contract specifications. (h) Assure the safety of the public, site personnel and surrounding properties. Where required, the plan shall be submitted to a regulatory authority for authorization; otherwise the components of the plan shall be submitted to one or more competent persons, within the organization conducting the blast, responsible for such authorization. A2.2 Contents A blast plan, should include, but not be limited to, the following: (a) Location of the proposed blasting. (b) Description of the proposed blasting. (c) Permits/licenses required for the project. (d) Identification and position of the person responsible for the project including project safety and security. (e) Identification and position of person who has given approval to use explosives on the project. (f) Key appointments and responsibilities. (g) Shotfirer’s details. (h) Details of the risk management assessment. (i) Details of adjacent structures or services that influence the blast design.

(j) Details of reports, drawings and records consulted. (k) Layout plan of the blast including drilling pattern and hole depths. (l) Detonation sequence/effective charge mass per delay (MIC)/powder factor. (m) Type of explosive to be used and quantity required. (n) Method of initiation. (o) Type of firing equipment and procedures. (p) Drilling procedures. (q) Explosive loading and charging procedures. (r) Explosive storage and handling procedures. (s) Security procedures for the site and the blast, including explosives. (t) Environmental considerations for airblast overpressure, ground vibration. NOTES: 1 Information on air blast overpressure and ground vibration is given in Appendix J. 2 Information on flyrock and fly is given in Appendix E. (u) Details of communication systems. (v) Warning procedures. (w) Traffic management plan. (x) Proposed dates and times of blasting. (y) Details of the exclusion zone. NOTE: See Appendix L. (z) Method of notification to owners and occupiers of structures, and providers of services adjacent to the blast.


(aa) Influence of weather. (bb) Loading in poor light conditions or reduced visibility. (cc) Cessation of explosive-related activities during electrical storms. (dd) Misfire management system. (ee) Post blast assessment and inspection procedures. (ff) Provision for post-blast comments. (gg) Signature spaces for the plan author, shotfirer and person who approves the plan. A3 BLAST RECORDS Details of the blast should be taken and maintained, including but not limited to the following: (a) Environmental conditions at the time of the blast. (b) Monitoring equipment including type, serial number and location. (c) Details of measurements recorded during the blast. (d) Details of flyrock or fly. (e) Details of incidents and complaints. (f) Comment on the results of the blast. (g) Proposed modification to the blast plan for future shots.

Provision for this information may be made on the blast plan.


Appendix 4 - Typical Blast Report;

26 Mar 2008

Blast Loading Sheet

Stem

(m)

Hole Depth

(m)

Deck 1 Deck 2 Deck 3

Product Kg Product Kg Product Kg

Blast

PFActual Actual Actualm m m Comments

Comment:

Filename

Title:

Location:

Mine: B/A2530-89 (BH-30 SH-126

LAUNCESTON

SURVEY 29/06/07

BL_89_screen.sp2

Matt Gibbins

A2.0A1 Hblk-Wet Stemming Hblk-Wet 10 0.475 9.5 7.2 5.310.52.0A2 Hblk-Wet Stemming Hblk-Wet 10 0.5610 8.5 7.0 5.110.32.0A3 Hblk-Wet Stemming Hblk-Wet 10 0.5710 8.6 7.1 5.210.42.0A4 Stemming Hblk-Wet Stemming 2 0.4497.0 5.3 3.810.5

2.0A5 Hblk-Wet Stemming Hblk-Wet 10 0.5110 8.5 7.0 5.110.32.0A6 Hblk-Wet Stemming Hblk-Wet 10 0.5110 8.5 7.0 5.110.32.0A7 Buster Stemming Hblk-Wet 9 0.535 8.6 7.0 5.310.52.0A8 Hblk-Wet Stemming Hblk-Wet 10 0.4710 8.9 7.3 5.410.72.1A9 Hblk-Wet Stemming Hblk-Wet 10 0.5510 9.0 7.4 5.510.82.0A10 ANFO Stemming ANFO 4 0.419 8.0 6.5 5.310.5

2.0A11 Stemming Hblk-Wet Stemming 2 0.32107.0 5.1 3.610.32.1A12 Hblk-Wet Stemming Hblk-Wet 10 0.5510 9.0 7.4 5.510.82.1A13 Hblk-Wet Stemming Hblk-Wet 10 0.5110 9.0 7.4 5.510.82.5A14 Hblk-Wet Stemming Hblk-Wet 10 0.5110 8.8 7.2 5.310.6

B2.0B1 Hblk-Wet Stemming Hblk-Wet 10 1.3610 8.7 7.1 5.310.62.0B2 Hblk-Wet Stemming Hblk-Wet 10 1.0810 8.5 7.0 5.210.4

2.0B3 Hblk-Wet Stemming Hblk-Wet 10 1.0810 8.7 7.2 5.410.52.0B4 Hblk-Wet Stemming Hblk-Wet 10 1.0710 8.6 7.1 5.210.42.0B5 Hblk-Wet Stemming Hblk-Wet 10 1.0010 8.5 7.0 5.110.32.0B6 Hblk-Wet Stemming Hblk-Wet 10 0.9810 8.6 7.1 5.310.52.0B7 Hblk-Wet Stemming Hblk-Wet 10 1.0410 8.6 7.1 5.310.52.0B8 Hblk-Wet Stemming Hblk-Wet 10 1.0910 8.6 7.1 5.310.5

2.0B9 Hblk-Wet Stemming Hblk-Wet 10 0.9210 8.6 7.1 5.310.52.0B10 Hblk-Wet Stemming Hblk-Wet 10 0.9410 8.7 7.2 5.410.52.0B11 Hblk-Wet Stemming Hblk-Wet 10 0.9710 8.7 7.1 5.310.62.0B12 Hblk-Wet Stemming Hblk-Wet 10 0.8810 8.8 7.2 5.310.62.0B13 Hblk-Wet Stemming Hblk-Wet 10 0.8110 8.7 7.2 5.310.5

C2.0C1 Hblk-Wet Stemming Hblk-Wet 10 0.4210 8.7 7.2 5.310.5

2.0C2 Hblk-Wet Stemming Hblk-Wet 10 0.8410 8.5 7.0 5.210.42.0C3 Hblk-Wet Stemming Hblk-Wet 10 0.9010 8.6 7.1 5.210.42.0C4 Hblk-Wet Stemming Hblk-Wet 10 0.8710 8.5 7.0 5.210.42.0C5 Hblk-Wet Stemming Hblk-Wet 10 0.8410 8.5 7.0 5.210.42.0C6 Hblk-Wet Stemming Hblk-Wet 10 0.8610 8.5 7.0 5.110.32.0C7 Hblk-Wet Stemming Hblk-Wet 10 0.9310 8.7 7.2 5.410.5

2.0C8 Hblk-Wet Stemming Hblk-Wet 10 0.9410 8.5 7.0 5.210.32.0C9 Hblk-Wet Stemming Hblk-Wet 10 0.9810 8.5 7.0 5.210.42.0C10 Hblk-Wet Stemming Hblk-Wet 10 1.0110 8.5 7.0 5.210.42.0C11 Hblk-Wet Stemming Hblk-Wet 10 0.9610 8.7 7.2 5.310.52.0C12 Hblk-Wet Stemming Hblk-Wet 10 0.8410 8.6 7.1 5.310.42.0C13 Hblk-Wet Stemming Hblk-Wet 10 0.8010 8.7 7.2 5.410.5

J2.0J1 Hblk-Wet Stemming ANFO 8 0.358 6.8 5.2 3.08.22.0J2 Hblk-Wet Stemming ANFO 9 0.335 7.2 5.6 3.08.12.0J3 Hblk-Wet Stemming ANFO 8 0.378 6.8 5.2 3.08.22.2J4 Hblk-Wet Stemming ANFO 10 0.4310 6.8 5.0 2.28.62.0J5 Hblk-Wet Stemming ANFO 10 0.4210 6.5 4.8 2.08.32.2J6 Hblk-Wet Stemming ANFO 10 0.3610 6.7 5.0 2.28.5

2.2J7 Hblk-Wet Stemming ANFO 10 0.4310 6.7 5.0 2.28.52.2J8 Hblk-Wet Stemming ANFO 10 0.5010 6.7 5.0 2.28.52.0J9 Hblk-Wet Stemming ANFO 9 0.5210 6.0 4.4 2.07.9

K

BLoadQS1.rpt 1

26 Mar 2008

Blast Loading Sheet

Stem

(m)

Hole Depth

(m)

Deck 1 Deck 2 Deck 3

Product Kg Product Kg Product Kg

Blast

PFActual Actual Actualm m m Comments

Comment:

Filename

Title:

Location:

Mine: B/A2530-89 (BH-30 SH-126

LAUNCESTON

SURVEY 29/06/07

BL_89_screen.sp2

Matt Gibbins

2.0K1 Hblk-Wet Stemming ANFO 9 0.8410 6.0 4.4 2.07.92.3K2 Hblk-Wet Stemming ANFO 8 0.7810 6.0 4.4 2.37.93.2K3 Hblk-Wet Stemming ANFO 5 0.9010 6.3 4.7 3.28.22.3K4 Hblk-Wet Stemming ANFO 9 1.0510 6.3 4.7 2.38.2

2.0K5 Hblk-Wet Stemming ANFO 10 0.7710 6.3 4.7 2.08.22.0K6 Hblk-Wet Stemming ANFO 10 0.7510 6.3 4.7 2.08.22.1K7 Hblk-Wet Stemming ANFO 10 0.7110 6.4 4.8 2.18.22.2K8 Hblk-Wet Stemming ANFO 10 0.7810 6.7 4.9 2.28.62.4K9 Stemming Stemming Stemming 2 0.006.3 4.7 2.48.1

L2.0L1 Hblk-Wet Stemming ANFO 10 0.7410 6.4 4.8 2.08.2

2.0L2 Hblk-Wet Stemming ANFO 10 0.7810 6.3 4.7 2.08.12.0L3 Hblk-Wet Stemming ANFO 10 0.6610 6.2 4.6 2.08.12.2L4 Hblk-Wet Stemming ANFO 10 0.6010 6.6 5.0 2.28.52.3L5 Hblk-Wet Stemming ANFO 10 0.6710 6.7 5.1 2.38.52.5L6 Hblk-Wet Stemming ANFO 10 0.6310 7.0 5.2 2.58.92.5L7 Hblk-Wet Stemming Hblk-Wet 7 0.667 7.7 6.2 4.99.0

2.5L8 Hblk-Wet Stemming Hblk-Wet 7 0.657 8.1 6.6 5.39.32.3L9 Hblk-Wet Stemming Hblk-Wet 9 0.609 8.5 7.0 5.310.22.0L10 Hblk-Wet Stemming Hblk-Wet 8 1.499 7.9 6.4 4.99.5

X8.1X1 Hblk-Wet 0.2210 8.19.9

240.32 1,427.81 5.34Blast Total

Powergel Buster 55 (EB55) DcpHandibulk Wet (BHBW)ANFO 0.8 (BANF)

0.71Computer calculated average PF1.702.10

Design burdenDesign spacingAve bench height 8.91

Cup Cnt Gasser Temp T. Cup A. Cup

BLoadQS1.rpt 2

26 Mar 2008 BLAST USAGE REPORT

Comment:

Filename

Title:

Location:

Mine: B/A2530-89 (BH-30 SH-126

LAUNCESTON

SURVEY 29/06/07

BL_89_screen.sp2

Matt Gibbins

USAGE

Bulk Explosives (kg)

240ANFO 0.8 (BANF)1,428Handibulk Wet (BHBW)

SUBTOTAL : 1,668

Primers (units)

177Anzomex H (PH)SUBTOTAL : 177

Down Hole Delays (units)

17Exel MS 6.1m,#12 40039Exel MS 7.3m,#12 40011Exel MS 9m,#12 40067Exel MS 12m,#12.5 42543Exel MS 15m,#13 450

SUBTOTAL : 177

Surface Delays (units)

1Exel Connectadet 9m 9ms44Exel Connectadet 4.9m 17ms2Exel Connectadet 4.9m 25ms21Exel Connectadet 4.9m 100ms2Exel Connectadet 6.1m 100ms

SUBTOTAL : 70

Sundry (units)

StemmingSUBTOTAL :

Drilling (m)

665Standard Drill, 76(m)SUBTOTAL : 665

Packaged (units)

6Powergel Buster 55 (EB55) DcpldSUBTOTAL : 6

Key Statistics

No. of Blastholes

Blasthole Length

Avg. Hole Depth (m)

Excavated Volume (inc PS) (bcm)

Avg. Bench Ht. (m)

PF (kg/m*3)

Burden (m)

Spacing (m)

69665

9.6

2,685

8.9

2.02.1

0.65

1UsageCQ.RPT

26 Mar 2008 Design, Evaluation and Usage Report

Mine B/A2530-89 (BH-30 SH-126)

Title

Blast Date

Blast TypeBlast Time

Author

Location

Rock TypeMatt Gibbins

LAUNCESTONSURVEY 29/06/07

Order no.Shotfirer

Blast Geometry

Blastholes Diameter (mm)

No. Blastholes

Bench Height (m)Burden (m)

Spacing (m)

Stemming (m)

Subdrill (m)

Blast Volume (BCM)Powder Factor (Kg/m^3)

8.9

2,577

76

0.62.0

1.70

2.10

Design Actual

Comments

Environmental Readings

Cloud Cover %

Wind (m/s)

M.I.C. (kg)

Direction

Fragmentation (visual only)

Max Dim (m) % Pass

(< 1m)(1 - 2m)(>2m)

DESIGN

Explosives and Accessories

PRODUCT ACTUAL COMMENTS

69

Dist (m)AB (dBL)PPV (mm/s)Location

Bulk Explosives (kg)

ANFO 0.8 (BANF) 240Handibulk Wet (BHBW) 1,428

Down Hole Delays (units)

Exel MS 6.1m,#12 400 17Exel MS 7.3m,#12 400 39Exel MS 9m,#12 400 11Exel MS 12m,#12.5 425 67Exel MS 15m,#13 450 43

Drilling (m)

Standard Drill, 76(m) 665Packaged (units)

Powergel Buster 55 (EB55) Dcpld 6Primers (units)

Anzomex H (PH) 177Sundry (units)

Stemming 0Surface Delays (units)

Exel Connectadet 4.9m 17ms 44Exel Connectadet 4.9m 25ms 2Exel Connectadet 4.9m 100ms 21Exel Connectadet 6.1m 100ms 2Exel Connectadet 9m 9ms 1

ProfileThrow (m)Rockpile Height (m)Power TroughWidth (m)Depth (m)

Sketch (for additional space use reverse side)

Overbreak: side (m)

Do primers, downline and Connectadet total reconcile against each other?

YES

NO IF NO, COMMENT ABOVE & CONTACT SUPERVISOR

0.00back (m) 0.00

Comments

ProfileFragm.

Overbreak

A1A2

A3A4A5

A6A7A8A9

A10A11

A12A13

B1B2B3B4B5B6B7B8B9B10B11B12B13

A14

J1J2

J3J4

J5J6J7

K1K2K3K4K5K6

L1L2L3L4L5L6L7

J8

J9K7

K8K9

L8

L9L10

C1C2C3C4C5C6C7C8C9C10C11C12

X1

C13

0

Blast Summary Data Burden: 1.7 (m) Spacing: 2.1 (m) Subdrill: 0.6 (m) Stemming: 2.0 (m) 1st row burden: 2.4 (m) Hole dia.: 76.00 (mm) Number holes: 69 Hole angle: 5.0 (deg) Total drilled: 665.3 (m)

Documents

BBA-PLN-1000-1400-0021-B-00 Blast Management …gunnspulpmill.com.au/...1000-1400-0021-B-00_Blast_Management_Plan.pdfBBA-PLN-1000-1400-0021-B-00 Blast Management Plan 1 of 5 BELL BAY