Boral Ltd.

Boral — Corporate Update (October 2018)

25 slides from Boral's corporate update, Oct 8, 2018

1. Slide 1: Berrima Colliery - Closure Working Group Meeting #2

   Berrima Colliery - Closure Working Group Meeting #2 >Welcome Mittagong RSL 8 October 2018

2. Slide 2: Agenda

   Agenda 1. Welcome and Apologies 2. Review of minutes & actions 3. Terms of Reference 4. Groundwater storage volume 5. Water Quality Trends and Preliminary Macroinvertebrate Comments 6. EPA Presentation – Ecotoxicology Study 7. Bulkhead Seals Explanation 8. EPL/MOP Updates Titlefefefefeffff4g45g4545

3. Slide 3: Welcome - CWG Representatives, Apologies & Guests

   Welcome - CWG Representatives, Apologies & Guests ● Boral - Fabio Colusso, Greg Johnson, David Spears, ● Resource Regulator - Greg Kininmonth, Will Mitry ● Environment Protection Authority - William Dove, Andrew Couldridge ● WaterNSW - Ravi Sundaram ● Wingecarribee Shire Council - Barry Arthur (apol

4. Slide 4: Review of Minutes – suggested amendments

   Review of Minutes – suggested amendments Titlefefefefeffff4g45g4545

5. Slide 5: Review of Actions

   Review of Actions ● CWG Terms of Reference and that it is not the only way Boral will engage with the Community Titlefefefefeffff4g45g4545

6. Slide 6: Terms of Reference

   Terms of Reference Minor change to clarify that the CWG will not be the only way Boral engages with the Community. Titlefefefefeffff4g45g4545

7. Slide 7: Estimated volume of water contained in the workings

   Estimated volume of water contained in the workings 548ML (Based on: Mine ceasing discharge on 1/09/2015 and free draining on 21/03/2016. 203 days X 2.7ML = 548ML) There was also a question in relation to the size of the mine void in total: 5.5 million m2 x 2.2 m (seam height) x 0.4 (% recovery) = T

8. Slide 8: Underground treatment installed in stages Dec 2017 to Jan 2018

   The underground treatment was installed in 3 stages from early December 2017 until mid January 2018 Titlefefefefeffff4g45g4545

9. Slide 9: Site and surrounding environment

   Site and surrounding environment Titlefefefefeffff4g45g4545

10. Slide 10: Discharge Volumes

    Discharge Volumes ● Additional pumping commenced early August 2018 ● Water level has now dropped 800- 900mm ● Sufficient level to install bulkheads ● Additional pumping has ceased and will revert to likely levels of 2.7ML average Titlefefefefeffff4g45g4545

11. Slide 11: Water Quality Trends - pH & EC

    Water Quality Trends - pH & EC Titlefefefefeffff4g45g4545

12. Slide 12: Water Quality Trends - Iron and Manganese

    Water Quality Trends - Iron and Manganese Titlefefefefeffff4g45g4545

13. Slide 13: Water Quality Trends - Nickel and Zinc

    Water Quality Trends - Nickel and Zinc Titlefefefefeffff4g45g4545

14. Slide 14: Water Quality Trends along the treatment path - Iron example

    Water Quality Trends along the treatment path - Iron example ● 400 D12 Sump - Pump pick up location Titlefefefefeffff4g45g4545 ● 400 C8 - After aeration, treatment through lime bed and filtered through goaf ● Adit Discharge - V - Notch sample

15. Slide 15: Macroinvertebrate study update - Preliminary findings

    Macroinvertebrate study update - Preliminary findings Based on (two sampling occasions in Autumn 2018) similar story to what was observed previously (2017), although thorough analysis not been completed at this stage. ● There was a loss of sensitive order mayflies (families Baetidae, Caenidae and Le

16. Slide 16: EPA Presentation – Ecotoxicology Assessment

    EPA Presentation – Ecotoxicology Assessment Titlefefefefeffff4g45g4545

17. Slide 17: Interim Sealing Plan - Location in respect of workings

    Interim Sealing Plan - Location in respect of workings Titlefefefefeffff4g45g4545

18. Slide 18: Bulkhead Seal design - Explained

    Bulkhead Seal design - Explained Titlefefefefeffff4g45g4545

19. Slide 19: Environmental Protection Licence/ Mine Operations Plan Updates

    Environmental Protection Licence/ Mine Operations Plan Updates EPL 608 ● Background - Special Condition R3 was added to the EPL late last year as a means to monitor the performance of the underground treatment trial. The condition requires water quality summary reports to discuss effectiveness of th

20. Slide 20: EPL/MOP Updates - Stage 1 Mine Closure Plan

    Environmental Protection Licence/ Mine Operations Plan Updates MOP - Stage 1 Mine Closure Plan Background - The current approved closure plan dated January 2018 excludes detail on the proposed bulkheads. Post the last CWG Boral provided the Resources Regulator a letter update on the bulkheads as an

21. Slide 21: Communication Plan - Workshop

    Communication Plan - Workshop Pamela Klioufis Titlefefefefeffff4g45g4545

22. Slide 22: Loch Catherine Update

    Loch Catherine Update Titlefefefefeffff4g45g4545

23. Slide 23: General business

    General business Titlefefefefeffff4g45g4545

24. Slide 24: Next meeting date

    Next meeting date Proposing: Monday 11 February 2019 9am – 1pm Location – Berrima Colliery (including a pit top site inspection) Titlefefefefeffff4g45g4545

25. Slide 25: Slide 25

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