LYNN LAKE GOLD PROJECT ENVIRONMENTAL IMPACT STATEMENT MAY 2020 Summary of the EIS Gordon Site MacLellan Site Lynn Lake Gold Project Environmental Impact Statement Summary of the EIS Prepared by: Stantec Consulting Ltd. May 25, 2020 LYNN LAKE GOLD PROJECT ENVIRONMENTAL IMPACT STATEMENT SUMMARY OF THE EIS Table of Contents ACRONYMS AND ABBREVIATIONS ........................................................................................ I GLOSSARY .............................................................................................................................. IV 1.0 INTRODUCTION AND ENVIRONMENTAL ASSESSMENT CONTEXT ...................... 1.1 1.1 INTRODUCTION ..........................................................................................................1.1 1.2 REGULATORY SETTING ............................................................................................ 1.1 1.2.1 Federal Regulatory Requirements ............................................................... 1.1 1.2.2 Provincial Regulatory Requirements ........................................................... 1.2 2.0 PROJECT OVERVIEW ................................................................................................2.1 2.1 PROJECT LOCATION ................................................................................................. 2.1 2.2 PROJECT BACKGROUND, OVERVIEW, AND OBJECTIVES .....................................2.1 2.3 PROJECT ACTIVITIES AND COMPONENTS ..............................................................2.3 2.3.1 Gordon Site ................................................................................................. 2.3 2.3.2 MacLellan Site ............................................................................................ 2.6 2.4 PROJECT DEVELOPMENT .......................................................................................2.11 2.4.1 Construction Phase Overview ................................................................... 2.11 2.4.2 Operation Phase Overview ....................................................................... 2.12 2.4.3 Decommissioning/Closure Phase Overview .............................................. 2.12 3.0 ALTERNATE MEANS OF CARRYING OUT THE PROJECT ......................................3.1 4.0 ENGAGEMENT ............................................................................................................4.1 4.1 REGULATORY ENGAGEMENT ...................................................................................4.1 4.2 STAKEHOLDER AND PUBLIC ENGAGEMENT ..........................................................4.2 4.3 ENGAGEMENT WITH INDIGENOUS PEOPLES .........................................................4.4 5.0 SUMMARY OF EFFECTS ASSESSMENT, MITIGATION AND DETERMINATION OF SIGNIFICANCE .......................................................................5.1 5.1 ENVIRONMENTAL SETTING ......................................................................................5.1 5.2 ENVIRONMENTAL ASSESSMENT APPROACH .........................................................5.2 5.3 ASSESSMENT BOUNDARIES.....................................................................................5.4 5.3.1 Spatial Boundaries ...................................................................................... 5.4 5.3.2 Temporal Boundaries .................................................................................. 5.4 5.4 ATMOSPHERIC ENVIRONMENT ................................................................................5.5 5.4.1 Existing Environment .................................................................................. 5.5 5.4.2 Environmental Effects ................................................................................. 5.5 5.5 NOISE AND VIBRATION..............................................................................................5.9 5.5.1 Existing Environment .................................................................................. 5.9 5.5.2 Environmental Effects ............................................................................... 5.10 5.6 GROUNDWATER.......................................................................................................5.12 5.6.1 Existing Environment ................................................................................ 5.12 5.6.2 Environmental Effects ............................................................................... 5.13 LYNN LAKE GOLD PROJECT ENVIRONMENTAL IMPACT STATEMENT SUMMARY OF THE EIS 5.7 SURFACE WATER ....................................................................................................5.16 5.7.1 Existing Environment ................................................................................ 5.16 5.7.2 Environmental Effects ............................................................................... 5.17 5.8 FISH AND FISH HABITAT .......................................................................................... 5.24 5.8.1 Existing Environment ................................................................................ 5.24 5.8.2 Environmental Effects ............................................................................... 5.25 5.9 VEGETATION AND WETLANDS ...............................................................................5.32 5.9.1 Existing Environment ................................................................................ 5.32 5.9.2 Environmental Effects ............................................................................... 5.33 5.10 WILDLIFE AND WILDLIFE HABITAT .........................................................................5.36 5.10.1 Existing Environment ................................................................................ 5.36 5.10.2 Environmental Effects ............................................................................... 5.37 5.11 LABOUR AND ECONOMY .........................................................................................5.43 5.11.1 Existing Environment ................................................................................ 5.43 5.11.2 Environmental Effects ............................................................................... 5.44 5.12 COMMUNITY SERVICES, INFRASTRUCTURE AND WELLBEING .......................... 5.47 5.12.1 Existing Environment ................................................................................ 5.47 5.12.2 Environmental Effects ............................................................................... 5.49 5.13 LAND AND RESOURCE USE ....................................................................................5.53 5.13.1 Existing Environment ................................................................................ 5.53 5.13.2 Environmental Effects ............................................................................... 5.54 5.14 HERITAGE .................................................................................................................5.58 5.14.1 Existing Environment ................................................................................ 5.58 5.14.2 Environmental Effects ............................................................................... 5.58 5.15 CURRENT USE OF LANDS AND RESOURCES FOR TRADITIONAL PURPOSES ...............................................................................................................5.59 5.15.1 Existing Environment ................................................................................ 5.59 5.15.2 Environmental Effects ............................................................................... 5.62 5.16 HUMAN HEALTH .......................................................................................................5.67 5.16.1 Existing Environment ................................................................................ 5.67 5.16.2 Environmental Effects ............................................................................... 5.67 5.17 INDIGENOUS PEOPLES ...........................................................................................5.69 5.17.1 Existing Environment ................................................................................ 5.69 5.17.2 Environmental Effects ............................................................................... 5.70 5.18 SUMMARY OF RESIDUAL EFFEECTS .....................................................................5.74 5.19 CUMULATIVE EFFECTS ...........................................................................................5.75 5.19.1 Atmospheric Environment ......................................................................... 5.75 5.19.2 Noise and Vibration ................................................................................... 5.75 5.19.3 Groundwater ............................................................................................. 5.76 5.19.4 Surface Water ........................................................................................... 5.76 5.19.5 Fish and Fish Habitat ................................................................................ 5.77 5.19.6 Vegetation and Wetlands .......................................................................... 5.77 5.19.7 Wildlife and Wildlife Habitat ....................................................................... 5.78 5.19.8 Labor and Economy .................................................................................. 5.78 5.19.9 Community Services, Infrastructure,