GREAT ARTESIAN BASIN WELLFIELDS REPORT 1 JULY 2009 - 30 JUNE 2010 Report No. ODENV 046 Uranium Olympic Dam Olympic Dam BHP Billiton Limited Uranium ABN 99 007 835 761 A member of the BHP Billiton Olympic Dam Corporation Pty Ltd, which is headquartered in Australia Registered Office: Rialto Towers Level 29, 525 Collins St, Melbourne, Victoria 3000, Australia ABN 49 004 028 077 OLYMPIC DAM GREAT ARTESIAN BASIN WELLFIELDS REPORT 1 JULY 2009 - 30 JUNE 2010 The Hon. Paul Holloway MLC Minister for Mineral Resources Development 9th Floor – Terrace Towers 178 North Terrace ADELAIDE SA 5000 EXTERNAL DISTRIBUTION Department of Primary Industries Chief Inspector of Mines 1 CD copy and Resources (SA) Department For Environment And CE Dept for Environment and 1 CD copy Natural Resources (SA) Natural Resources Principle Scientific Officer – 1 CD copy Pastoral Program Environment Protection Authority CE Environment Protection 1 CD copy (SA) Authority EPA Licence Coordinator 1 CD copy Manager Mining & Environment 1 CD copy Group Radiation Protection Branch Department For Water (SA) CE Dept for Water 1 CD copy Senior Hydrogeologist 1 CD copy Great Artesian Basin Coordinating The Chair 1 CD copy Committee South Australian Arid Lands Natural The Chair 1 CD copy Resources Management Board INTERNAL DISTRIBUTION BHP Billiton Adelaide President Uranium 1 CD copy Vice President – External Affairs 1 CD copy Corporate Lawyer 1 CD copy Sustainability Manager 1 CD copy BHP Billiton Olympic Dam Asset President Olympic Dam 1 CD copy General Manager Mine 1 CD copy General Manager Surface 1 CD copy General Manager Services 1 CD copy Head of HSEC 1 CD copy Manager Environment and Radiation 1 CD copy Environmental Section Library 2 hard copies 2 CD copies Records Centre 2 hard copies 1 CD copy 1 JULY 2009 - 30 JUNE 2010 BHP BILLITON OLYMPIC DAM GREAT ARTESIAN BASIN WELLFIELDS REPORT Table of Contents 1 EXECUTIVE SUMMARY..........................................................................6 2 INTRODUCTION ......................................................................................7 2.1 Scope ..................................................................................................................7 2.2 Background .........................................................................................................7 2.3 Legal Criteria .....................................................................................................11 3 MONITORING PROGRAM.....................................................................12 3.1 Monitoring Sites and Schedules........................................................................12 3.2 Parameters and Measurements ........................................................................14 4 ABSTRACTION .....................................................................................16 4.1 Development History .........................................................................................16 4.2 Olympic Dam Abstraction during the Current Review Period............................16 4.3 Pastoral Abstraction ..........................................................................................16 4.4 Total Abstraction................................................................................................17 5 WELLFIELD A AREA AQUIFER RESPONSE ......................................23 5.1 Monitoring Program Requirements....................................................................23 5.2 Wellfield A Sub-Basin........................................................................................23 5.3 North east Sub-Basin ........................................................................................31 5.4 Hermit Hill..........................................................................................................31 5.5 Boundary of Wellfield A Designated Area .........................................................31 6 WELLFIELD B AREA AQUIFER RESPONSE ......................................36 6.1 Monitoring Program Requirements....................................................................36 6.2 Overall Response and Boundary of Wellfield B Designated Area.....................37 6.3 Northern Observation Bores..............................................................................43 6.4 South east Observation Bores...........................................................................43 6.5 Eastern Springs Zone........................................................................................43 6.6 Crows Nest Area ...............................................................................................50 6.7 Key Pastoral Bores............................................................................................50 6.8 Drawdown Impacts on Pastoral Bore Operation ...............................................53 7 GAB SPRING FLOW .............................................................................55 7.1 Monitoring Program Requirements....................................................................55 7.2 Results...............................................................................................................55 8 GROUNDWATER CHEMISTRY ............................................................57 8.1 Monitoring Program Requirements....................................................................57 8.2 Results...............................................................................................................57 9 GAB WATER USE EFFICIENCY...........................................................60 9.1 Monitoring Program Requirements....................................................................60 9.2 Results...............................................................................................................60 EXECUTIVE SUMMARY PAGE 1 BHP BILLITON OLYMPIC DAM 1 JULY 2009 - 30 JUNE 2010 GREAT ARTESIAN BASIN WELLFIELDS REPORT 10 RESOURCE SUSTAINABILITY AND MANAGEMENT ........................ 61 10.1 Historical Perspective ........................................................................................61 10.2 Further Exploration and Development ...............................................................61 10.3 Future Perspective.............................................................................................61 11 WELLFIELDS INVESTIGATIONS AND TECHNICAL WORKS PROGRAM ............................................................................................ 62 11.1 Installation of Four New Monitoring Bores.........................................................63 11.2 Increased Monitoring of Jackboot Bore and the New Monitoring Bores............64 11.3 Undertake a Review of Existing Structural Geology and Seismic Information.........................................................................................................66 11.4 Conduct New Seismic Work (if required)...........................................................67 11.5 Enhance the Existing Hydrogeological Model ...................................................67 11.6 Review the Reference Pressures for all Compliance Monitoring Wells.............67 11.7 Identify alternative monitoring point(s) for Wellfield A and B or recommend new drawdown action triggers for existing monitoring points ............................71 11.8 Develop a proposal for ongoing sustainable management of BHP Billiton’s extractions from the GAB...................................................................................71 11.9 Discussion .........................................................................................................71 11.10 Summary and Conclusions................................................................................72 12 RECOMMENDATIONS.......................................................................... 73 13 REFERENCES ...................................................................................... 74 14 APPENDIX 1: SUMMARY OF MONITORING RECORDS FOR FY10.. 76 15 APPENDIX 2: CALIBRATION CERTIFICATES FOR DRUCK PRESSURE TRANSDUCERS............................................................... 84 16 APPENDIX 3: SUMMARY OF SPRING FLOW DATA FY10 ................ 86 17 APPENDIX 4: HISTORICAL SPRING FLOW RATES .......................... 88 18 APPENDIX 5: SUMMARY OF FIELD CHEMISTRY DATA FY10 ....... 103 19 APPENDIX 6: CONDUCTIVITY TREND DATA .................................. 110 20 APPENDIX 6: TEN YEAR FORWARD SCHEDULE FOR GAB ABSTRACTION................................................................................... 118 21 APPENDIX 7: NOMENCLATURE AND CODING FOR GAB SPRINGS............................................................................................. 119 21.1 Spring Nomenclature and Coding....................................................................119 21.2 Monitored Springs............................................................................................119 22 APPENDIX 8: MINISTER’S PROGRAM OF TECHNICAL WORKS ... 121 PAGE 2 EXECUTIVE SUMMARY 1 JULY 2009 - 30 JUNE 2010 BHP BILLITON OLYMPIC DAM GREAT ARTESIAN BASIN WELLFIELDS REPORT List of Figures Figure 2-1: Wellfield A location map...........................................................................8 Figure 2-2: Wellfield B location map...........................................................................9 Figure 2-3: Monitored spring groups showing hydrogeological domains .................10 Figure 4-1: Historical abstraction from Wellfields A and B – 3 month
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