20 March 2017 REPORT ON Analysis of Environmental Effects from the Diavik Diamond Mine on Wildlife in the Lac de Gras Region Submitted to: Diavik Diamond Mines (2012) Inc. PO Box 2498 300 - 5201 50th Avenue Yellowknife, NT X1A 2P8, Canada Attention: Mr. David Wells Golder Reference Number: 1648005-1582-R-Rev0-19000 Diavik PO Number: D03598 Work Plan Number: WP525 Rev0 REPORT Distribution: 1 Electronic Copy - Diavik Diamond Mines (2012) Inc. 1 Hard Copy - Golder Associates Ltd. ANALYSIS OF ENVIRONMENTAL EFFECTS FROM THE DIAVIK DIAMOND MINE ON WILDLIFE IN THE LAC DE GRAS REGION Table of Contents 1.0 INTRODUCTION .................................................................................................................................................... 1 1.1 Background .............................................................................................................................................. 1 1.2 Assumptions and Modelling Approach ...................................................................................................... 2 2.0 CARIBOU .............................................................................................................................................................. 4 2.1 Introduction ............................................................................................................................................... 4 2.1.1 Caribou Density .................................................................................................................................. 4 2.1.2 Methods .............................................................................................................................................. 5 2.1.3 Results ................................................................................................................................................ 6 2.1.4 Satellite- and GPS-collared Caribou ................................................................................................... 9 2.1.5 Methods .............................................................................................................................................. 9 2.1.6 Results ................................................................................................................................................ 9 2.2 Conclusions ............................................................................................................................................ 11 3.0 MINE ACTIVITY INDICES ................................................................................................................................... 12 3.1 Introduction ............................................................................................................................................. 12 3.2 Methods .................................................................................................................................................. 12 3.3 Results .................................................................................................................................................... 12 3.4 Conclusions ............................................................................................................................................ 14 4.0 WOLVERINE ....................................................................................................................................................... 15 4.1 Introduction ............................................................................................................................................. 15 4.2 Methods .................................................................................................................................................. 16 4.3 Results .................................................................................................................................................... 22 4.4 Conclusions ............................................................................................................................................ 29 5.0 CLOSURE ............................................................................................................................................................ 30 REFERENCES .............................................................................................................................................................. 31 20 March 2017 Golder Reference No. 1648005-1582-R-Rev0-19000 i ANALYSIS OF ENVIRONMENTAL EFFECTS FROM THE DIAVIK DIAMOND MINE ON WILDLIFE IN THE LAC DE GRAS REGION TABLES Table 2.1-1: Aerial Caribou Survey Frequencies and Study Areas for the EKATI and Diavik Areas, 1998 to 2009 ........ 5 Table 2.1-2: Number of Satellite- and GPS-Collared Bathurst Caribou Cows that Traveled West or East of Lac de Gras during the Northern and Southern Migration, 1996 to 2016 ................................................................. 10 Table 4.2-1: Survey Periods for Wolverine Snow Tracks, 2003 to 2013 ....................................................................... 19 Table 4.3-1: Summary of Wolverine Track Density Indices and Weather, 2003 to 2013 .............................................. 23 Table 4.3-2: Models for the Probability of Wolverine Track Occurrence from Mixed-Model Logistic Regression Analysis ........................................................................................................................................................ 27 Table 4.3-3: Logistic Regression Coefficients () of Variables in the Top Candidate Model of Wolverine Snow Track Occurrence (Top Candidate Model = Year [continuous] + Transect Length + Snow) .................................. 28 FIGURES Figure 2.1-1: Relationship between the Nearest Distance to the Mine (km) and Density of Caribou per km2 ................. 6 Figure 2.1-2: Mean Caribou Density in the Study Area, 1998 to 2001 ............................................................................ 7 Figure 2.1-3: Mean Caribou Density in the Study Area, 2009 to 2012 ............................................................................ 8 Figure 3.3-1: Correlation between Monthly Number of Full-Time Equivalents (FTEs) and Monthly Number of Flights . 13 Figure 3.3-2: Correlation between Monthly Number of Full-Time Equivalents (FTEs) and Monthly Number of Blasts .. 13 Figure 3.3-3: Correlation between Monthly Number of Full-Time Equivalents (FTEs) and Monthly Number of Blasts .. 14 Figure 4.2-1: Location of Wolverine Snow Track Transects, 2003 to 2006 ................................................................... 17 Figure 4.2-2: Location of Wolverine Snow Track Transects, 2008 to 2016 ................................................................... 18 Figure 4.2-3: The Distribution of Distances Moved by Radio-marked Wolverine in the North Slave Region during a One to Five Day Interval in March to April, 1996 to 1999 ............................................................................. 20 Figure 4.2-4: Third-order Polynomial Fit to Calving-ground Estimates of Bathurst Herd Size, 1986 to 2015 ................ 22 Figure 43-1: Correlation between Interpolated Annual Estimates of Bathurst Caribou Herd Size and Wolverine Track Density Index in the Diavik Regional Study Area ......................................................................................... 24 Figure 4.3-2: Correlation between Interpolated Annual Estimates of Bathurst Caribou Herd Size and Probability of Wolverine Track Occurrence in the Diavik Regional Study Area .................................................................. 24 Figure 4.3-3: Correlation between Number of Workers at Diavik Mine and Wolverine Track Density Index in the Diavik Regional Study Area .................................................................................................................................... 25 Figure 4.3-4: Correlation between Number of Workers at Diavik Mine and Probability of Wolverine Track Occurrence in the Diavik Regional Study Area ................................................................................................................ 25 Figure 4.3-5: Correlation between Tons of Waste Rock and Wolverine Track Density Index in the Diavik Regional Study Area ................................................................................................................................................... 26 Figure 4.3-6: Correlation between Tons of Waste Rock and Probability of Wolverine Track Occurrence in the Diavik Regional Study Area .................................................................................................................................... 26 Figure 4.3-7: Probability Predictions (± 95% CI) of Wolverine Snow Track Occurrence from the Top Ranked Model .. 28 20 March 2017 Golder Reference No. 1648005-1582-R-Rev0-19000 ii ANALYSIS OF ENVIRONMENTAL EFFECTS FROM THE DIAVIK DIAMOND MINE ON WILDLIFE IN THE LAC DE GRAS REGION APPENDICES APPENDIX A Average Number of Employees per Month at the Diavik Diamond Mine (2000 to 2016) APPENDIX B Average Number of Flights per Month at the Diavik Diamond Mine (2003 to 2016) APPENDIX C Average Number of Blasts per Month at the Diavik Diamond Mine (2007 to 2013, 2015, and 2016) APPENDIX D Total Waste Rock Hauled (×1000 tonnes) per Month at the Diavik Diamond Mine (2003 to 2016) 20 March 2017 Golder Reference No. 1648005-1582-R-Rev0-19000 iii ANALYSIS OF ENVIRONMENTAL EFFECTS FROM THE DIAVIK DIAMOND MINE ON WILDLIFE