Boral — Corporate Update (December 2022)
43 slides from Boral's corporate update, Dec 14, 2022
Slide 1: Berrima Colliery – Closure Working Group Meeting #16
Click to edit Master title style Subheader Berrima Colliery – Closure Working Group Meeting #16 14 December 2022 DRAFT – Not for distribution
Slide 2: Agenda
Agenda 1. Welcome and Apologies - Introductions 2. Terms of Reference - Conduct of CWG Members 3. Review of minutes & actions 4. Water Quality Results update - Greg Johnson 5. Water treatment update- Greg Johnson/David Spears 6. Pit top treatment and pipeline REF update– Greg Johnson 7. Resource Reg
Slide 3: Welcome and Apologies
01 Welcome and Apologies
Slide 4: CWG Representatives, Apologies & Guests
CWG Representatives, Apologies & Guests ● Boral - Girish Yadwad (apology), Greg Johnson, David Spears, Kate Woodbridge (apology) ● Resource Regulator - Greg Kininmonth, Peter McMillan ● Environment Protection Authority – Greg Newman (apology), Andrew Couldridge, ● WaterNSW - Ravi Sundaram ● Wingecar
Slide 5: Terms of Reference – Code of Conduct
02 Terms of Reference – Code of Conduct
Slide 6: Terms of Reference – Code of Conduct
Terms of Reference – Code of Conduct 6
Slide 7: Review of minutes and actions
03 Review of minutes and actions
Slide 8: Review of Minutes – suggested amendments
Review of Minutes – suggested amendments 8
Slide 9: Review of minutes - actions
Review of minutes - actions Summary of Meeting Actions: Boral to include water quality testing from behind the bulkheads and report results at the next meeting. Extend a further invitation to Medway representative for the next meeting. Boral to provide a draft of the REF to WaterNSW and the Resource
Slide 10: Water Quality Results Update
04 Water Quality Results Update
Slide 11: Surface Water Monitoring Update
Surface Water Monitoring Update 11
Slide 12: Water Quality Guidelines
Water Quality Guidelines In order to interpret and give context to the water quality monitoring results from the Colliery we are now including details, where applicable, against the Australian Water Quality Guidelines for Freshwater Protection, Australian Water Quality Guidelines – Primary Industry
Slide 13: Adit discharge update – Volume, pH & EC
Adit discharge update – Volume, pH & EC Volume discharged – 1.9 ML per day (av.) pH – recent results more towards a neutral level by dosing EC – slight uptick above 1000uS/cm 13
Slide 14: Adit discharge update – Iron & Manganese
Adit discharge update – Iron & Manganese Iron –has settled back down. Manganese – has continued to trend down 14
Slide 15: Adit discharge update – Nickel and Zinc
Adit discharge update – Nickel and Zinc Nickel – Back to post bulkhead trend. Zinc – Back to post bulkhead trend Commentary – Recent spikes in metals have settled down. Increased lime dosage and aeration is key. Water quality will be easier to manage at the surface once the pit top treatment system
Slide 16: River Quality Update
River Quality Update BCRAL ©
Slide 17: River quality update – pH & EC
River quality update – pH & EC Similar results to last quarter. High stream flows continue. pH – No influence in river at Biloela (6km) EC – No influence in river at Biloela (6km) 17
Slide 18: River quality update – iron & manganese
River quality update – iron & manganese Iron – No influence on river. Manganese – Elevated levels in the stream are likely the result of high stream flow from rain events. 18
Slide 19: River quality update – Nickel and Zinc
River quality update – Nickel and Zinc Nickel – River is below 95% protection down stream. Zinc – Levels below 95% protection down stream. 19
Slide 20: River quality update – Sulphate and commentary
River quality update – Sulphate and commentary Copper – Below stock drinking levels. Other sources influencing. Sulphate –Well below any trigger points. 20
Slide 21: Bulkhead Water Quality Results
Bulkhead Water Quality Results The water behind the bulkheads remains poor. 21
Slide 22: pH and Electrical Conductivity behind bulkheads
pH BHA SHE Electrical Conductivity BH2 1350 BH2 BH4 BH4 BHS BHS BH7 = BH7 = 1250 e. 2 e = s a . = 1150 2 a ° 3 8 ° 5 a . a s a * 1050 a so | FPP FPF PPP Pr Pr PM Pr PP PP FP SP PPP PP PP PPP PP FP FF SF SF SH PF SF oS SM a ‘i ." \\ re” ew” Sh FHKE HF FP_F_F_F_HF_ LF F_F_F_F_ FFF
Slide 23: Nickel and Zinc concentrations
Concentration (mg/L) BHI BH2 BHa BHS BH7 Nickel (Total) Concentration (mg/L) as Zinc (Total) BHI BH2 BH4 BHS BH7
Slide 24: Water Treatment Update
OS Water Treatment Update eee
Slide 25: Water treatment update
Water treatment update • The mine water quality behind the bulkheads remains poor, the underground water treatment system remains in operation to manage the mine water discharge quality. • Volumes of waters discharging has been consistent at 1.9ML • The pH of water was within the licence conditions.
Slide 26: Bulkhead water level update
Bulkhead water level update The underground water level behind the bulkheads has been retained at a reasonably constant height as is indicated in the above graph. With mine water levels behind the bulkheads managed though the underground mine water treatment pumping system. The monitoring the surrou
Slide 27: Pit Top Treatment & Pipeline EPL EIP & Review of Environmental Factors
06 Pit Top Treatment & Pipeline EPL EIP & Review of Environmental Factors
Slide 28: Tip Top Treatment and Pipeline – EPL EIP
Tip Top Treatment and Pipeline – EPL EIP • The NSW EPA finalised the licence variation in December 2021. 28
Slide 29: Review of Environmental Factors – Status
Review of Environmental Factors – Status Rob Byrnes from IEC has now prepared a draft report. 29
Slide 30: Draft REF – Proposed Pipeline Route
Draft REF – Proposed Pipeline Route 30
Slide 31: Draft REF – Project Outline
Draft REF – Project Outline In summary, • Pumping water from the mine to a purpose built passive treatment at the pit top • Treatment system will involve aeration, pH correction and settlement via multi celled ponds. • Treated water can be discharged back into the mine Wingecarribee River via a new
Slide 32: Draft REF – Summary of Impacts
Draft REF – Summary of Impacts The project will results in the following impacts: • Increased traffic along Medway Road during first six months of construction, up to 10 trucks per day, averaging 2. (Dam construction materials/pipework, plant and equipment) • No additional traffic once operational.
Slide 33: Draft REF – Summary of Benefits
Draft REF – Summary of Benefits The project will result in the following benefits: • Reduction of environmental risks as a result of mine closure • Improved water quality within the Wingecarribee due to more consistent and effective water treatment capability • Better reuse of the water resource by
Slide 34: DRAFT REF – Next Steps
DRAFT REF – Next Steps Boral has met with the EPA. Following potential concerns for discharging upstream of the existing adit, Boral is proposing to discharge back into the mine to release via V-notch weir and the existing adit. Boral held a community day on Sat 26 November at Berrima Church hall. T
Slide 35: Resources Regulator Update
07 Resources Regulator Update
Slide 36: Resources Regulator Activity Update
Resources Regluator Activity Update The RR has issued Boral a directive to update the groundwater model and run long term closure scenarios. This modelling exercise and work will run until late April 2023. The outcome should finalise the closure option and the pit top treatment and pipeline proposal
Slide 37: Medway Community Update
08 Medway Community Update
Slide 38: Medway Community update
Medway Community update Welcome Guest – Lance Ward Vice President of the Medway Community Association Open discussion 38
Slide 39: Communications Update
9 Communications Update
Slide 40: Community drop-in session and local issues
• A community drop-in session was held in Berrima on Saturday 26th November to answer questions regarding the proposed pit top treatment and pipeline project from the colliery to the cement works. • We have been approached by a few residents at Medway about illegal dumping of garden waste and other
Slide 41: General Business
10 General Business
Slide 42: Next Meeting
11 Next Meeting Proposed 26 May 2023
Slide 43: Thanks for your participation
Thanks for your participation 43