Britannia Mine Remediation Project

1. Britannia Mine Remediation Project Britannia Shoreline Public Meeting June 25, 2008 www.britanniamine.ca

2. Why are we here? • Provide a brief overview of where we are at • Engage members of the community about where we are going. • Build on significant stakeholder consultation which contributed to the Overall Remediation Plan

3. Why are we here? • Focus is on the Britannia shoreline and eventually setting resource conservation objectives (RCO).

4. Agenda • Welcome and Introductions • Overview of the Britannia Remediation Project • Summary of Environmental Monitoring • Resource Conservation Objectives • Participation and Feedback • Closing: Questions and Answers

5. What’s the Problem? • Britannia Mine - “the largest point source of metal pollution in North America discharging to a marine environment”until October 2005 • Naturally occurring metal sulphide orebody

6. Environmental Issues • Acid Rock Drainage (ARD) was discharging from the mine (~5million m3/year) - copper, zinc, cadmium, pH~3.5 • Metal-contaminated groundwater: • Alluvial Fan of Britannia Creek • Waste dump leaching • Metal-contaminated surface water (run-off) • All the above impact aquatic life in Howe Sound and local waterways: • Squamish River salmon run

7. 4100 Level Mine Entrance Britannia Creek Mill Building Britannia Creek Alluvial Fan (‘Fan Area’) BC Museum of Mining Highway 99 ‘Concentrate Wharf’

8. 3D Cutaway of Britannia Mine Jane Basin Mineral Creek 2200 Portal Victoria Shaft Britannia Creek 2700 Portal 2700L 4100 L Britannia Beach #10 Shaft 4100 Plug Howe Sound 4100 Portal Mine Levels defined in feet measured downwards from highest elevation in mine

9. Province’s Remedial Concept • Inflow Diversions • Collection/storage of ARD • Treatment of ARD • Deep outfall • Groundwater capture/treatment • Surface water management • Contaminated soil management • Monitoring & Risk Assessment Prevention: Inflow diversion Collection: (Plug installed in 2200 level In 2001 by UBC/CERM3) Management of contaminated waste rock and groundwater Treatment: of mine drainage Use of mine void as storage/ balancing reservoir Plug with control valve Mill Howe Sound New Deep Outfall Management of contaminated groundwater Assessment of contaminated sediments (Environment Canada)

10. Overall Remediation Plan (ORP) • Prepared by Golder on behalf of Ministry of Agriculture and Land (MAL) in 2003; • Input from Crown Land Restoration Branch, technical consultants, BC and Federal regulators and project stakeholders; • Strategy evolved from years of study and assessment since mine closure in 1974

11. ORP Objectives • Reduce discharge of harmful substances (metals) to habitable areas and aquatic communities; • Protect, sustain and promote recovery; • Achieve and maintain acceptable levels of risk to health and safety for humans and other terrestrial organisms; • Implement in a timely and cost effective manner

12. Review of Progress • Immediate Actions • 2200 Plug • Removal of Mill Building Concentrate Pile • Removal of lower settling pond sediment • Removal and stabilisation of sedimentation pond • Removal of mill slope soils* • Ground and storm water interception in Fan Area • Surface water diversions in Jane Basin • First stage of monitoring and assessment * Now a potential action: surface & groundwater control in lieu

13. Review of Progress • Committed Actions • Mine water collection and storage • Mine water treatment plant • New deep water outfall • WTP sludge disposal • Stage 2 of monitoring and assessment

14. Review of Progress • Potential Actions • Additional Fan Area groundwater interception • Additional surface water diversions • Remediate additional mine wastes and portals* • Additional Fan Area surface and storm water management, collection and treatment** • Remediate Fan Area soils*** • Remediate Fan Area inter-tidal zone*** *Some completed/in progress. Review ongoing ** Underway *** Contingent on risk assessment findings

15. Additional ORP Requirements • Environmental remediation is primary focus of the ORP, however additional objectives include: • Mitigation of public health and safety risks • Compliance with Section 10.6 and 10.7 of the BC mine Code

16. ORP Status Summary • Immediate remedial actions have all been implemented (excl. Mill Slopes) • Committed remedial actions have all been implemented • Potential remedial actions • Most implemented • Remainder under review

17. ORP Status Summary • ‘Potential’ remedial actions ongoing/under consideration • 2200 Level Waste Dump Hazardous Waste identified and remedial plan in progress to be implemented this year • 2200 Level Waste Dump drainage improvements – to be implemented this year • Beta Portal discharge diversion (potential diversion back into the mine)

18. Risk Assessment • Screening-level risk assessment was used to identify environmental risk and prepare ORP • A more detailed aquatic and terrestrial monitoring programme and risk assessment was proposed (Tier 2 Assessment)* • The detailed assessment would be used to refine potential risks and select any appropriate additional remedial actions • Current status: defining Resource Conservation Objectives

19. Planning out risk assessment? • Large site • Mine workings that exist across 2 watersheds

20. Why a Risk Assessment Plan? • Large site • Mine workings that exist across 2 watersheds • Ore processing area located along Howe Sound

21. Furry Creek Watershed • Limited surface water sampling • Water chemistry generally good. • Limited remedial work • Recommended that a Problem Formulation/Sampling & Analysis Plan be prepared (first part of a risk assessment)

22. Britannia Creek Watershed • Dominant influence on Britannia Cr water quality is from Jane Creek • Some waste materials removed; planning underway to remove Haz Waste at 2200 level. • Jane Creek drains a naturally mineralized area.

23. Britannia Creek Watershed

24. Britannia Creek Watershed • RA not likely to contribute to near-term remedial actions • Natural mineralization of the area may constrain practicability of remediation to plausible RA endpoints • Near-term: • Investigate sources • Remediation of selected potential sources

25. Fan Area • Monitoring indicates: • Contaminant concentrations in nearshore groundwater are high • Biological assessment and testing – significant adverse localized effects • Risk assessment at present is not seen to play a major role until sources are controlled • Development of Resource Conservation Objectives will aid in defining remedial endpoints at this time and will form a basis for future RA. • How clean is clean enough?

26. Environmental Monitoring FindingsBritannia Shoreline • 3 main program components: • Marine water quality • Nearshore groundwater quality (porewater) • Shoreline ecology

28. Station Locations

29. Marine Surface Water Chemistry - Intertidal

30. Total copper Dissolved copper Marine Surface Water - Subtidal 0.002 mg/L = chronic WQG 0.003 mg/L = maximum WQG

31. Pore Water Chemistry 0.002 mg/L = chronic WQG 0.003 mg/L = maximum WQG

32. Pore Water Toxicity- Mytilus galloprovincialis 2005 2006 (ns)

33. Intertidal Community Structure

34. Intertidal Zone High Mid Low 100 100 100 80 80 80 60 60 60 40 40 40 20 20 20 0 0 0 Clado- phora sp. Clado- phora sp. Entero- morpha sp. Entero- morpha sp. Fucus gardneri Fucus gardneri Mytilus edulis Mytilus edulis Balanus glandula Balanus glandula Intertidal Community Structure 2006 Spring Spring Summer Summer % Coverage (Mean  SD) Fall Fall Reach BB-6 Reach BB-3

35. Intertidal Community Structure Reach BB-3 (Spring 2006) Reach BB-6 (Spring 2006)

36. Caged Bivalve Study

37. Tissue Copper (mg/kg ww) Change in Weight (g; mean  SD) Caged Bivalve Study - 2005

38. Resource Conservation Objectives • How good is good enough? • More often thought of in terms of chemical concentrations • Can also be expressed in ecological terms as a shoreline community condition and/or function

39. How good is good enough? Example: percent cover by mussels and barnacles Community interests and values assist scientists in defining what is “good enough” Resource Conservation Objectives

40. Resource Conservation Objectives • Shoreline Use: • Human use of the shoreline • Ecological use of the shoreline • What is important to you? • Community aspirations should influence resource conservation objectives and remedial measures to attain those

41. Resource Conservation Objectives • In addition to community values, there are regulatory requirements. • Ministry of Environment, Environment Canada, Fisheries and Oceans Canada • Agency consultation will take place, following community consultation (projected for Fall 2008) • Agency input to the project has been ongoing through the TAC • Agency representatives in attendance tonight.

42. Now its your turn… • Questionnaire available here and online: • http://websurvey.golder.com/wsb.dll/lnikl/BritanniaShorelineConsultation.htm • Scientists and engineers working on the project are present this evening to help you • Please review the posters and other materials, ask them questions, formulate your thoughts and tell us what you think!