April 2017April 2017ppEnvironmental Update Environmental Update

f SLEMA B df SLEMA B dfor SLEMA Boardfor SLEMA BoardZhong LiuZhong LiuZhong LiuZhong Liu

April 30, 2017April 30, 2017

OutlineOutlineOutlineOutline1.1. Mine UpdateMine Update2.2. Inspection UpdateInspection Update3.3. Regulators’ UpdateRegulators’ Update3.3. Regulators UpdateRegulators Update4.4. Aboriginal UpdateAboriginal Update55 Stakeholders’ UpdateStakeholders’ Update5.5. Stakeholders’ UpdateStakeholders’ Update6.6. SLEMA ReviewsSLEMA Reviews

AcronymsAcronyms AEMPAEMP Aquatic Effects Monitoring ProgramAquatic Effects Monitoring Program AEMP AEMP –– Aquatic Effects Monitoring ProgramAquatic Effects Monitoring Program ARD ARD –– Acid Rock DrainageAcid Rock Drainage DFO DFO –– Fisheries and Oceans CanadaFisheries and Oceans Canada ECCCECCC –– Environment and Climate Change CanadaEnvironment and Climate Change Canada ECCC ECCC Environment and Climate Change CanadaEnvironment and Climate Change Canada ECM ECM –– Extended Care and MaintenanceExtended Care and Maintenance ENR ENR –– Department of Environment and Natural Resources, GNWTDepartment of Environment and Natural Resources, GNWT EQC EQC –– Effluent Quality CriterionEffluent Quality Criterionyy GNWT GNWT –– Government of the Northwest TerritoriesGovernment of the Northwest Territories INAC INAC –– Indigenous and Northern Affairs Canada (formerly Indigenous and Northern Affairs Canada (formerly

Aboriginal Affairs and Northern Development Canada [AANDC]) Aboriginal Affairs and Northern Development Canada [AANDC]) MVEIRBMVEIRB M k i V ll E i t l I t R i B dM k i V ll E i t l I t R i B d MVEIRB MVEIRB –– Mackenzie Valley Environmental Impact Review BoardMackenzie Valley Environmental Impact Review Board MVLWB MVLWB –– Mackenzie Valley Land and Water BoardMackenzie Valley Land and Water Board PK PK –– Processed Processed KimberliteKimberlite SLEMASLEMA –– Snap Lake Environmental Monitoring AgencySnap Lake Environmental Monitoring Agency SLEMA SLEMA –– Snap Lake Environmental Monitoring AgencySnap Lake Environmental Monitoring Agency SNP SNP –– Surveillance Network ProgramSurveillance Network Program SSWQO SSWQO –– SiteSite--Specific Water Quality ObjectiveSpecific Water Quality Objective TDSTDS –– Total Dissolved SolidsTotal Dissolved Solids TDS TDS Total Dissolved SolidsTotal Dissolved Solids WEMP WEMP –– Wildlife Effects Monitoring ProgramWildlife Effects Monitoring Program WTP WTP –– Water Treatment PlantWater Treatment Plant WMP WMP –– Water Management PondWater Management Pond

1.1 Mine Update1.1 Mine Update –– March 2017March 20171.1 Mine Update 1.1 Mine Update March 2017March 2017 The Snap Lake Mine remained in suspended The Snap Lake Mine remained in suspended

operations (Extended Care and Maintenance)operations (Extended Care and Maintenance) Flooding of the underground workings is onFlooding of the underground workings is on--going going

•• 4 647 m4 647 m33 of water withdrawn from Snap Lakeof water withdrawn from Snap Lake•• 4,647 m4,647 m33 of water withdrawn from Snap Lakeof water withdrawn from Snap Lake•• No treated water discharged into Snap LakeNo treated water discharged into Snap Lake

No reportable spillsNo reportable spills Water sampled in 2 monitoring stationsWater sampled in 2 monitoring stations

SNP 02SNP 02--15 (water intake), 0215 (water intake), 02--16i (sewage effluent)16i (sewage effluent)Th di h t th l k f St ti 02Th di h t th l k f St ti 02 There was no discharge to the lake from Station 02There was no discharge to the lake from Station 02--17B after February 917B after February 9

1.2 Snap Lake Mine Care and 1.2 Snap Lake Mine Care and M iM i Q l U dQ l U dMaintenance Maintenance –– Quarterly UpdateQuarterly Update

Submitted on April 3 3017Submitted on April 3 3017 Submitted on April 3, 3017Submitted on April 3, 3017 For March 2017 the Snap Lake Mine remains For March 2017 the Snap Lake Mine remains

in suspended operationsin suspended operationsin suspended operationsin suspended operations•• “De Beers continues to follow the Extended Care “De Beers continues to follow the Extended Care

and Maintenance Plan (ECM) that was approved and Maintenance Plan (ECM) that was approved by the MVLWB on June 22by the MVLWB on June 22, 2016.”, 2016.”

2 Inspection Update2 Inspection Update2. Inspection Update 2. Inspection Update

Inspector Inspector –– Andrew Andrew HowtonHowtonppWater Water LicenceLicence InspectionsInspections

No inspection reports received in April 2016No inspection reports received in April 2016 No inspection reports received in April 2016 No inspection reports received in April 2016

3 Regulators’ Update3 Regulators’ Update –– MVLWB (I)MVLWB (I)3. Regulators Update 3. Regulators Update MVLWB (I) MVLWB (I)

Requested reviewers to submit commentsRequested reviewers to submit commentsRequested reviewers to submit comments Requested reviewers to submit comments on 2016 Water on 2016 Water LicenceLicence Annual Report, on Annual Report, on April 5 2017April 5 2017April 5, 2017April 5, 2017 Comments due on May 3 Comments due on May 3

4 Aboriginal Update4 Aboriginal Update4. Aboriginal Update4. Aboriginal Update

No comments received in April 2017No comments received in April 2017No comments received in April 2017No comments received in April 2017

5 Stakeholders’ Update5 Stakeholders’ Update5. Stakeholders Update5. Stakeholders Update

No comments received in April 2017No comments received in April 2017No comments received in April 2017No comments received in April 2017

6 SLEMA Reviews6 SLEMA Reviews6. SLEMA Reviews6. SLEMA Reviews 2016 Water 2016 Water LicenceLicence Annual Report Annual Report

6.1 2016 Water6.1 2016 Water LicenceLicence Annual ReportAnnual Report6.1 2016 Water 6.1 2016 Water LicenceLicence Annual ReportAnnual Report

Submitted on March 31, 2017Submitted on March 31, 2017 Provided information and data in order to fulfill the Provided information and data in order to fulfill the

annual reporting requirements of Water annual reporting requirements of Water LicenceLicenceMV201L2MV201L2--00040004

Four appendices attachedFour appendices attached•• Appendix I 2016 Snap Lake Mine Surveillance Network Appendix I 2016 Snap Lake Mine Surveillance Network

Program Water Quality DataProgram Water Quality Data•• Appendix II Geochemical Field Inspection Report 2016Appendix II Geochemical Field Inspection Report 2016•• Appendix II Geochemical Field Inspection Report, 2016 Appendix II Geochemical Field Inspection Report, 2016 •• Appendix III Acid/Alkaline Rock Drainage and Appendix III Acid/Alkaline Rock Drainage and

Geochemical Characterization Report, 2016Geochemical Characterization Report, 2016•• Appendix IV Geotechnical Instrumentation Monitoring Appendix IV Geotechnical Instrumentation Monitoring

Program Summary, 2016 Program Summary, 2016

Comments from the Comments from the Environmental Analyst (I)Environmental Analyst (I)

It i id t th t th b i i did tIt i id t th t th b i i did t It is evident that the submission did not It is evident that the submission did not follow the Schedule 1, Part B of the Water follow the Schedule 1, Part B of the Water LiLi MV201L2MV201L2 0004 ( 23 t 25 f0004 ( 23 t 25 fLicenceLicence MV201L2MV201L2--0004 (pages 23 to 25 of 0004 (pages 23 to 25 of 66, current to: September 8, 2016) 66, current to: September 8, 2016) Part of the Table of Contents is out of datePart of the Table of Contents is out of date The following requirements are not fulfilledThe following requirements are not fulfilled

Schedule 1 Part B 1q 1t (geotechnical inspection report)Schedule 1 Part B 1q 1t (geotechnical inspection report) Schedule 1, Part B 1q, 1t (geotechnical inspection report), Schedule 1, Part B 1q, 1t (geotechnical inspection report), dddd, , eeee, ff, , ff, gggg, , hhhh

Information and data related to the aforementioned Information and data related to the aforementioned diti h ld b dd d i t th A l R tditi h ld b dd d i t th A l R tconditions should be added into the Annual Report. conditions should be added into the Annual Report.

ReRe--submission is requestedsubmission is requested

Comments from the Comments from the Environmental Analyst (II)Environmental Analyst (II)

Th f diti i i th T blTh f diti i i th T bl There are a few editing issues in the Table There are a few editing issues in the Table of Contents of Contents A few tables missing in Page iv A few tables missing in Page iv

Tables 10Tables 10--1, 111, 11--1, 121, 12--1, 141, 14--1, etc.1, etc. Figure 11Figure 11--2?2? Figure 11Figure 11--2?2?

6.2 Appendix I 2016 Snap Lake Mine 6.2 Appendix I 2016 Snap Lake Mine SurveillanceSurveillance Network Program WaterNetwork Program WaterSurveillance Surveillance Network Program Water Network Program Water

Quality DataQuality Data SNP data have been analyzed on aSNP data have been analyzed on a SNP data have been analyzed on a SNP data have been analyzed on a

monthly basis, and any findings had been monthly basis, and any findings had been reported in the Environmental Updates inreported in the Environmental Updates inreported in the Environmental Updates in reported in the Environmental Updates in 20162016

6.3 Appendix II Geochemical 6.3 Appendix II Geochemical Field Inspection Report, 2016Field Inspection Report, 2016

Prepared byPrepared by ArktisArktis Solutions for De BeersSolutions for De Beers Prepared by Prepared by ArktisArktis Solutions for De BeersSolutions for De Beers The 2016 site inspection was conducted by The 2016 site inspection was conducted by

staff from ARKTIS Solutions Inc betweenstaff from ARKTIS Solutions Inc betweenstaff from ARKTIS Solutions Inc. between staff from ARKTIS Solutions Inc. between August 30 August 30 and and September 5, 2016September 5, 2016

A visual inspection of the EngineeredA visual inspection of the Engineered A visual inspection of the Engineered A visual inspection of the Engineered Structures designed to contain, withhold, Structures designed to contain, withhold, retain, or divert Water or Waste was retain, or divert Water or Waste was completed, including the North Pile, sumps, completed, including the North Pile, sumps, Water Management Pond (WMP), etc.Water Management Pond (WMP), etc.

Seventeen rock grab samples and ten water Seventeen rock grab samples and ten water grab samples were collectedgrab samples were collected

Aerial View of Starter Cell and Aerial View of Starter Cell and East Cell AreasEast Cell Areas

Aerial View of Mine Site including Aerial View of Mine Site including Process Plant and Water ManagementProcess Plant and Water ManagementProcess Plant and Water Management Process Plant and Water Management

PondPond

Report Conclusion and Report Conclusion and RecommendationsRecommendations

All locations inspected continue to show noAll locations inspected continue to show no All locations inspected continue to show no All locations inspected continue to show no apparent signs of incipient acid generation or apparent signs of incipient acid generation or Acid Rock Drainage based on visual Acid Rock Drainage based on visual ggobservations. Assessment of the geochemical observations. Assessment of the geochemical laboratory analysis for rock and water are laboratory analysis for rock and water are

i d t fi ti thi li ii d t fi ti thi li irequired to confirmation this preliminary required to confirmation this preliminary observation.observation.

S l f t di fl i t h ldS l f t di fl i t h ld Samples of standing or flowing water should Samples of standing or flowing water should continue to be collected from the ten locations continue to be collected from the ten locations identified within the North Pile perimeter ditchesidentified within the North Pile perimeter ditchesidentified within the North Pile perimeter ditches, identified within the North Pile perimeter ditches, quarry, quarry, landfarmlandfarm area and Il6 Ditch as part of the area and Il6 Ditch as part of the spring and fall seepage surveysspring and fall seepage surveys

Comments from the Comments from the Environmental AnalystEnvironmental Analyst

The site photos presented in the AppendixThe site photos presented in the Appendix The site photos presented in the Appendix The site photos presented in the Appendix A are helpful for reviewers to understand A are helpful for reviewers to understand the mine site situationsthe mine site situationsthe mine site situationsthe mine site situations

No concerns are raisedNo concerns are raised R t d ti t dR t d ti t d Report recommendations are supportedReport recommendations are supported

6.4 Appendix III Acid/Alkaline Rock 6.4 Appendix III Acid/Alkaline Rock Drainage and GeochemicalDrainage and GeochemicalDrainage and Geochemical Drainage and Geochemical

Characterization Report, 2016 Characterization Report, 2016 This report summarizes the acid/alkaline rockThis report summarizes the acid/alkaline rock This report summarizes the acid/alkaline rock This report summarizes the acid/alkaline rock

drainage (ARD) and geochemical conditions observed drainage (ARD) and geochemical conditions observed at the Mine in 2016at the Mine in 2016 Appendix A Selected Photographs from 2016 Site InspectionAppendix A Selected Photographs from 2016 Site Inspection Appendix B Water Quality Results From Several Locations Appendix B Water Quality Results From Several Locations

S l d i S t f th 2016 G h i t E l tiS l d i S t f th 2016 G h i t E l tiSampled in Support of the 2016 Geochemistry EvaluationSampled in Support of the 2016 Geochemistry Evaluation Appendix C Water Quality Results from Selected Appendix C Water Quality Results from Selected

Surveillance Network Program Monitoring StationsSurveillance Network Program Monitoring StationsSurveillance Network Program Monitoring StationsSurveillance Network Program Monitoring Stations Appendix D Results of Geochemical Characterization of Appendix D Results of Geochemical Characterization of

Supplemental Geochemistry SamplesSupplemental Geochemistry Samples Appendix E 2016 Seepage Survey Summary ReportAppendix E 2016 Seepage Survey Summary Report

Snap Lake Mine Site Configuration, Snap Lake Mine Site Configuration, i l di G h i t S l L tii l di G h i t S l L tiincluding Geochemistry Sample Locationsincluding Geochemistry Sample Locations

Snap Lake Mine Site Configuration, Snap Lake Mine Site Configuration, i l di t it i l tii l di t it i l tiincluding water monitoring locationsincluding water monitoring locations

ARD Monitoring ProgramARD Monitoring ProgramARD Monitoring ProgramARD Monitoring Program

The study area consisted of the undergroundThe study area consisted of the underground The study area consisted of the underground The study area consisted of the underground Mine and surface facilities, including the North Mine and surface facilities, including the North Pile, WMP, roadways, pads, and any other Pile, WMP, roadways, pads, and any other y p yy p yareas where rock has been disturbed or areas where rock has been disturbed or depositeddeposited The results of geochemical characterization of PK, The results of geochemical characterization of PK,

metavolcanicmetavolcanic, and granite rock collected in 2016 were , and granite rock collected in 2016 were used to evaluate the conditions at the Mine relative toused to evaluate the conditions at the Mine relative toused to evaluate the conditions at the Mine relative to used to evaluate the conditions at the Mine relative to the existing geochemical datasetthe existing geochemical dataset

The results of water quality analysis were used to The results of water quality analysis were used to l t t d i d ff lit t thl t t d i d ff lit t thevaluate trends in seepage and runoff quality at the evaluate trends in seepage and runoff quality at the

Mine site Mine site

MinewaterMinewater Discharge Rate Discharge Rate through December 31, 2016through December 31, 2016

MinewaterMinewater Discharge (SNP 02Discharge (SNP 02--01)01)MinewaterMinewater Discharge (SNP 02Discharge (SNP 02 01)01)

Water Management Pond Stilling Well Water Management Pond Stilling Well C t ti (SNP 02C t ti (SNP 02 14)14)Concentrations (SNP 02Concentrations (SNP 02--14)14)

North Pile Runoff Water Quality North Pile Runoff Water Quality (SNP 02(SNP 02--02)02)

Water Quality in the Vicinity of the Explosive Water Quality in the Vicinity of the Explosive St F ilit (SNP 02St F ilit (SNP 02 07 d SNP 0207 d SNP 02 09)09)Storage Facility (SNP 02Storage Facility (SNP 02--07 and SNP 0207 and SNP 02--09)09)

Assessment of Potential for Assessment of Potential for Acidic or Alkaline Drainage (I)Acidic or Alkaline Drainage (I)

KimberliteKimberlite and Processedand Processed KimberliteKimberlite KimberliteKimberlite and Processed and Processed KimberliteKimberlite Classified as nonClassified as non--AG, confirmed by longAG, confirmed by long--term term

kinetic leach testingkinetic leach testingkinetic leach testingkinetic leach testingMetavolcanicMetavolcanic

I lI l t l it l i t i lt i l In general, In general, metavolcanicsmetavolcanics contain low contain low neutralization potentialneutralization potentialThe results of ongoing kinetic testingThe results of ongoing kinetic testing The results of ongoing kinetic testing The results of ongoing kinetic testing indicated that samples of indicated that samples of metavolcanicmetavolcanic rock rock that contained up to 0.29%that contained up to 0.29% sulphidesulphide--sulphursulphurthat contained up to 0.29% that contained up to 0.29% sulphidesulphide sulphursulphurwere not likely to generate aciditywere not likely to generate acidity

Assessment of Potential for Assessment of Potential for Acidic or Alkaline Drainage (II)Acidic or Alkaline Drainage (II)GraniteGraniteGraniteGranite

The main development rock The main development rock lithologylithology at the at the MineMineMineMine

Two classifications have been developed for Two classifications have been developed for granitic rock at the Minegranitic rock at the Minegranitic rock at the Minegranitic rock at the Mine

•• granitic rock not associated with granitic rock not associated with metavolcanicsmetavolcanicsand faulting; andand faulting; and

•• granitic rock associated with granitic rock associated with metavolcanicsmetavolcanics and and faulting or containing elevated faulting or containing elevated sulphidesulphidecontent includingcontent including development rock near thedevelopment rock near thecontent,includingcontent,including development rock near the development rock near the granite granite metavolcanicmetavolcanic interface and granite in interface and granite in dilution rockdilution rock

2016 PK samples had similar geochemical characteristics 2016 PK samples had similar geochemical characteristics to samples collected during the EAR and previous to samples collected during the EAR and previous p g pp g p

geochemical assessmentsgeochemical assessments

The results of The results of metavolcanicmetavolcanic samples analysis collected in samples analysis collected in 2016 do not change the geochemical interpretation of 2016 do not change the geochemical interpretation of

t l it l i di d i th EAR th ARD ddi d i th EAR th ARD dmetavolcanicmetavolcanic discussed in the EAR, or the ARD and discussed in the EAR, or the ARD and Geochemistry PlanGeochemistry Plan

The composition of granite samples collected in The composition of granite samples collected in 2016 falls within the range of composition of other2016 falls within the range of composition of other2016 falls within the range of composition of other 2016 falls within the range of composition of other

samples in the granite datasetsamples in the granite dataset

Report Conclusions and Report Conclusions and Recommendations (I)Recommendations (I)

Geochemical Site InspectionGeochemical Site Inspectionpp No visible signs of incipient acid generation No visible signs of incipient acid generation

were observed in the roads, rock pads or were observed in the roads, rock pads or ppbuilding foundations at the Minebuilding foundations at the Mine

Geochemical Characterization of Mine Geochemical Characterization of Mine Rock and Processed Rock and Processed KimberliteKimberlite The composition of 18 samples collected in The composition of 18 samples collected in p pp p

2016 was within the range of composition of 2016 was within the range of composition of samples in the existing geochemical datasetsamples in the existing geochemical dataset

The geochemical assessment of The geochemical assessment of kimberlitekimberlite, , PK and granite has not changedPK and granite has not changed

Report Conclusions and Report Conclusions and Recommendations (II)Recommendations (II)

It is not expected that theIt is not expected that the metavolcanicmetavolcanic It is not expected that the It is not expected that the metavolcanicmetavolcanicmaterials currently near surface on site will materials currently near surface on site will result in acidic conditions developing in the result in acidic conditions developing in the p gp grunoffrunoff

Based on the current results and existing Based on the current results and existing geochemical dataset, the geochemical criteria geochemical dataset, the geochemical criteria for mine rock management as outlined in De for mine rock management as outlined in De B 2014 id d i t dB 2014 id d i t dBeers 2014 are considered appropriate and Beers 2014 are considered appropriate and no changes to these criteria are proposed at no changes to these criteria are proposed at this timethis timethis timethis time

Report Conclusions and Report Conclusions and Recommendations (III)Recommendations (III)

Mine Water Quantity and QualityMine Water Quantity and QualityMine Water Quantity and QualityMine Water Quantity and Quality MinewaterMinewater inflow rates remained stable and inflow rates remained stable and

TDS loading rates increased throughout 2016TDS loading rates increased throughout 2016TDS loading rates increased throughout 2016 TDS loading rates increased throughout 2016 as expectedas expected

Observed flow rates and water quality at SNPObserved flow rates and water quality at SNP Observed flow rates and water quality at SNP Observed flow rates and water quality at SNP 0202--01 as measured in 2016 are generally 01 as measured in 2016 are generally consistent with the updated water quality consistent with the updated water quality predictions made in 2013predictions made in 2013

Report Conclusions and Report Conclusions and Recommendations (IV)Recommendations (IV)

Site Runoff and SeepageSite Runoff and Seepage Site Runoff and SeepageSite Runoff and Seepage The results of water quality analysis at most SNP The results of water quality analysis at most SNP

monitoring stations, bog and seepage monitoring monitoring stations, bog and seepage monitoring stations was similar to concentration trends observed stations was similar to concentration trends observed during the previous monitoring yearduring the previous monitoring year

Observed water quality at SNP 02Observed water quality at SNP 02--02 (North Pile) was02 (North Pile) was Observed water quality at SNP 02Observed water quality at SNP 02--02 (North Pile) was 02 (North Pile) was similar to water quality predictions made in the 2013 similar to water quality predictions made in the 2013 Base Case Site Water Quality Model, with the Base Case Site Water Quality Model, with the

ti fti f l h tl h t d j i Thd j i Thexception of exception of sulphatesulphate and some major ions. These and some major ions. These values were higher than predictionsvalues were higher than predictions

Report Conclusions and Report Conclusions and Recommendations (V)Recommendations (V)

Bogs in the vicinity of the airstrip are reporting someBogs in the vicinity of the airstrip are reporting some Bogs in the vicinity of the airstrip are reporting some Bogs in the vicinity of the airstrip are reporting some elevated nitrate (0.05 to 16 mg/L) and major ion elevated nitrate (0.05 to 16 mg/L) and major ion concentrations on the southeast side and require concentrations on the southeast side and require ongoing monitoring to evaluate trends or to assess ifongoing monitoring to evaluate trends or to assess ifongoing monitoring to evaluate trends, or to assess if ongoing monitoring to evaluate trends, or to assess if the results are due to evaporation near or at the the results are due to evaporation near or at the sample location and/or runoff from blasting activities sample location and/or runoff from blasting activities at the nearby quarry locationat the nearby quarry location

Comments from the Comments from the Environmental AnalystEnvironmental Analyst

No concerns are raisedNo concerns are raisedNo concerns are raisedNo concerns are raised

6.4.1 Appendix E 2016 Seepage 6.4.1 Appendix E 2016 Seepage S S RS S RSurvey Summary ReportSurvey Summary Report

ARKTIS Solutions Inc. was contracted byARKTIS Solutions Inc. was contracted by ARKTIS Solutions Inc. was contracted by ARKTIS Solutions Inc. was contracted by De Beers to complete the 2016 Seepage De Beers to complete the 2016 Seepage Survey ReportSurvey ReportSurvey ReportSurvey Report

Two seepage surveys were conducted Two seepage surveys were conducted from June 14 to 15 2016 and August 30 tofrom June 14 to 15 2016 and August 30 tofrom June 14 to 15, 2016 and August 30 to from June 14 to 15, 2016 and August 30 to September 3, 2016September 3, 2016

Early summer and fall seepage surveysEarly summer and fall seepage surveys Early summer and fall seepage surveys Early summer and fall seepage surveys involved visually identifying any flow and/or involved visually identifying any flow and/or pondedponded water about the perimeters of thewater about the perimeters of thepondedponded water about the perimeters of the water about the perimeters of the following Waste areas: ore stockpiles, waste following Waste areas: ore stockpiles, waste rock and tailings pilerock and tailings pile

2016 Water Quality Monitoring Locations2016 Water Quality Monitoring Locations2016 Water Quality Monitoring Locations2016 Water Quality Monitoring Locations

Main Findings of the 2016 Main Findings of the 2016 Seepage SurveysSeepage Surveys

Nearly all monitoring locations had at least oneNearly all monitoring locations had at least one Nearly all monitoring locations had at least one Nearly all monitoring locations had at least one measurement that was elevated compared to the Water measurement that was elevated compared to the Water Licence’sLicence’s treated effluent quality criteria. The monitoring treated effluent quality criteria. The monitoring locations except for bogs and some SNP stations arelocations except for bogs and some SNP stations arelocations, except for bogs and some SNP stations, are locations, except for bogs and some SNP stations, are within a catchment at the mine that directs the water to within a catchment at the mine that directs the water to the water management pond for treatment tothe water management pond for treatment to

ensure Water ensure Water LicenceLicence effluent quality criteria at the effluent quality criteria at the controlled discharge to Snap Lake is achievedcontrolled discharge to Snap Lake is achieved

Elevated concentrations of TSS and aluminum at theElevated concentrations of TSS and aluminum at the Elevated concentrations of TSS and aluminum at the Elevated concentrations of TSS and aluminum at the reference bog near the emulsion plant suggest some reference bog near the emulsion plant suggest some parameters for site water are also likely within the range parameters for site water are also likely within the range of natural environmental variabilityof natural environmental variability

Comments from the Comments from the Environmental AnalystEnvironmental Analyst

No concerns are raisedNo concerns are raisedNo concerns are raisedNo concerns are raised Monitoring results at the bogs Monitoring results at the bogs downgradientdowngradient

of the North Pile and WMP indicate that thereof the North Pile and WMP indicate that thereof the North Pile and WMP indicate that there of the North Pile and WMP indicate that there were no abnormally elevated measurements. were no abnormally elevated measurements. It is a good sign, but continual seepage It is a good sign, but continual seepage g g , p gg g , p gsurveys are required to identify potential spillssurveys are required to identify potential spills

6.5 Appendix IV Geotechnical 6.5 Appendix IV Geotechnical Instrumentation Monitoring ProgramInstrumentation Monitoring ProgramInstrumentation Monitoring Program Instrumentation Monitoring Program

Summary, 2016 (I)Summary, 2016 (I) Prepared byPrepared by ArktisArktis Solutions for De BeersSolutions for De Beers Prepared by Prepared by ArktisArktis Solutions for De BeersSolutions for De Beers

Results from the monitoring of Results from the monitoring of thermistorsthermistors, , piezometerspiezometers, and survey prisms installed on the Site , and survey prisms installed on the Site were presented in this reportwere presented in this report

Monitoring data from 1999 to 2016Monitoring data from 1999 to 2016

Report Conclusions and Report Conclusions and R d tiR d tiRecommendationsRecommendations

In general, the geotechnical conditions and trends at theIn general, the geotechnical conditions and trends at the In general, the geotechnical conditions and trends at the In general, the geotechnical conditions and trends at the North Pile and Water Management Pond are consistent North Pile and Water Management Pond are consistent with previous years, and no notable changes were with previous years, and no notable changes were observed throughout 2016 with the possible exceptionobserved throughout 2016 with the possible exceptionobserved throughout 2016, with the possible exception observed throughout 2016, with the possible exception of a potential decrease in the active layer thickness of a potential decrease in the active layer thickness along the shoreline of Snap Lake and a potential along the shoreline of Snap Lake and a potential decrease in water levels adjacent to Dam 1decrease in water levels adjacent to Dam 1

Some Some thermistorsthermistors, , piezometerspiezometers, and survey prisms in the , and survey prisms in the North Pile and WMP have become damagedNorth Pile and WMP have become damagedNorth Pile and WMP have become damaged. North Pile and WMP have become damaged. Replacement or repair is recommendedReplacement or repair is recommended

It is recommended that the geotechnical information It is recommended that the geotechnical information presented in this report be used to inform annual presented in this report be used to inform annual geotechnical inspection of the Minegeotechnical inspection of the Mine

Comments from the Comments from the Environmental AnalystEnvironmental Analyst

No concerns are raisedNo concerns are raisedNo concerns are raisedNo concerns are raised Report recommendations are supportedReport recommendations are supported