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821 documents · Page 5 of 42

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Surveillance Network Program (SNP) Summary and Waste Rock Seepage Survey Report, Appendices A-B, Ekati Diamond Mine (Arctic Canadian Diamond Company, December 2021)
31 December 2021Report
This 2021 Surveillance Network Program (SNP) summary and Waste Rock Seepage Survey report documents water quality monitoring and effluent compliance at the Ekati Diamond Mine under Water Licence W2020L2-0004, including monthly sampling results from multiple surveillance stations, seepage quality assessments across waste rock storage areas, and identification of twelve seeps of potential concern requiring adaptive management.
SNP Water Quality Effluent Quality Criteria Regulatory
Interim Closure and Reclamation Plan (ICRP) 2021 Annual Progress Report, Ekati Diamond Mine (Arctic Canadian Diamond Company, December 2021)
23 December 2021Report
Arctic Canadian Diamond Company's 2021 Annual Closure and Reclamation Progress Report documents reclamation research, activities, and monitoring completed at the Ekati Diamond Mine to meet Water Licence W2020L2-0004 reporting requirements. The report details engagement activities, reclamation research findings, completed and planned progressive reclamation activities, and updates on reclamation security held by the Government of the Northwest Territories totaling $282,126,775 as of December 31, 2021.
Closure & Reclamation Closure Plan Revegetation Waste Rock Regulatory
Aquatic Effects Monitoring Program (AEMP) Annual Report 2021, Appendices C-E, Ekati Diamond Mine (Arctic Canadian Diamond Company, December 2021)
23 December 2021Report
The 2021 Aquatic Effects Monitoring Program (AEMP) Annual Report for Ekati Diamond Mine documents monitoring results across three watersheds (Koala, King-Cujo, and Horseshoe) and associated downstream lakes, evaluating physical limnology, water quality, sediment quality, and aquatic biology. The report also includes a 2021 Closure and Reclamation Progress Report detailing reclamation research, engagement activities, and progressive reclamation activities at the mine site.
Aquatic Effects Monitoring (AEMP)Aquatics Water Quality Closure & Reclamation
Waste Rock and Ore Storage Management Plan (WROMP), Version 11.0, Ekati Diamond Mine (Arctic Canadian Diamond Company, June 2021)
29 June 2021Report
Arctic Canadian Diamond Company submitted Waste Rock and Ore Storage Management Plan (WROMP) Version 11.0 to the Wek'èezhìi Land and Water Board addressing regulatory directives and incorporating a new Seepage Response Framework to manage waste rock seepage quality at the Ekati Diamond Mine. The plan details geochemical characterization, storage area designs, monitoring protocols, and adaptive management procedures for multiple kimberlite pipes and waste rock storage areas across the mine site.
Waste Rock Acid Rock Drainage Geochemistry
Aquatic Effects Monitoring Program (AEMP) 2020 Annual Report, Review Letter, Ekati Diamond Mine (Independent Environmental Monitoring Agency, June 2021)
4 June 2021Letter
The Independent Environmental Monitoring Agency reviews Arctic Diamond's 2020 Ekati Aquatic Effects Monitoring Plan Annual Report, noting reduced field activities due to COVID-19 and providing specific comments on mercury in fish tissues, under-ice oxygen depletion in Cujo Lake, and elevated potassium concentrations in Leslie Lake, with two recommendations for further investigation and mitigation.
Aquatic Effects Monitoring (AEMP)Aquatics Water Quality
Seepage Survey Report, Ekati Diamond Mine (Arctic Canadian Diamond Company, April 2021)
1 April 2021Report
This 2020 annual waste rock and seepage survey report for the Ekati Diamond Mine documents geochemical monitoring of waste rock storage areas and seepage quality from multiple mine pits and underground operations. The report identifies five seeps of potential concern based on exceedances of effluent quality criteria and 95th percentile screening thresholds, with detailed adaptive management responses outlined for each.
Waste Rock Acid Rock Drainage Geochemistry
Aquatic Effects Monitoring Program (AEMP) Annual Report 2020, Cover Letter, Ekati Diamond Mine (Arctic Canadian Diamond Company, March 2021)
31 March 2021Report
Arctic Canadian Diamond Company Ltd submits the 2020 Aquatic Effects Monitoring Program (AEMP) Annual Report for the Ekati Diamond Mine to the Wek'èezhìi Land and Water Board, documenting monitoring results during a period of reduced field sampling due to COVID-19 care and maintenance operations. The report identifies Action Level exceedances for four biological variables across multiple lakes and includes updates to water quality benchmarks and a Cujo Lake aeration strategy follow-up.
Aquatic Effects Monitoring (AEMP)Aquatics Water Quality
Review of 2020 Open-Water Action Level Exceedances, Potassium, Aquatic Effects Monitoring Program (AEMP), Ekati Diamond Mine (Independent Environmental Monitoring Agency, March 2021)
16 March 2021Letter
The IEMA notifies the Wek'eezhii Land and Water Board of its review of 2020 open-water action level exceedances reported by Arctic Canadian Diamond Company Ltd., expressing concerns about potential chronic effects from continued long-term low potassium exceedances.
Water Quality Aquatic Effects Monitoring (AEMP)Correspondence
Aquatic Effects Monitoring Program (AEMP) 2020 Annual Report, Cujo Lake Dissolved Oxygen Monitoring Memo, Ekati Diamond Mine (Arctic Canadian Diamond Company, March 2021)
11 March 2021Memo
This memorandum reports on 2020 mitigation and monitoring efforts for low under-ice dissolved oxygen (DO) concentrations in Cujo Lake at the Ekati Diamond Mine. An aerator installed in January 2020 failed in February and could not be repaired; monitoring showed DO concentrations fell below the CCME guideline of 6.5 mg/L by late March, with comparative monitoring at White and Alexia lakes suggesting that low under-ice DO may be driven by natural lake morphology rather than mining activities.
Aquatics Aquatic Effects Monitoring (AEMP)Water Quality
Aquatic Effects Monitoring Program (AEMP) 2020 Annual Report, Part 2, Statistical Report, Ekati Diamond Mine (Arctic Canadian Diamond Company, March 2021)
1 March 2021Report
This is Part 2 of the 2020 Aquatic Effects Monitoring Program (AEMP) statistical report for the Ekati Diamond Mine, presenting detailed statistical analyses of water quality, phytoplankton, zooplankton, and benthic data collected from multiple watersheds and lakes. The report employs linear mixed effects regression and Tobit regression models to compare monitored sites with reference sites across multiple years (1998-2020) to detect potential mine-related effects on aquatic ecosystems.
Aquatic Effects Monitoring (AEMP)Aquatics Water Quality
Aquatic Effects Monitoring Program (AEMP) Annual Report 2020, Part 1, Ekati Diamond Mine (Arctic Canadian Diamond Company, March 2021)
1 March 2021Report
The 2020 Aquatic Effects Monitoring Program (AEMP) Annual Report for the Ekati Diamond Mine documents a reduced field sampling program implemented due to COVID-19 care and maintenance operations, evaluating physical limnology, water quality, and aquatic biology across four monitored watersheds and associated downstream lakes. The report presents findings on mine-related changes in environmental parameters, Action Level exceedances, and Response Plans for the Koala, King-Cujo, Pigeon-Fay/Upper Exeter, and Horseshoe watersheds.
Aquatic Effects Monitoring (AEMP)Aquatics Water Quality
Aquatic Effects Monitoring Program (AEMP) 2020 Annual Report, Appendix A Data Report, Ekati Diamond Mine (Arctic Canadian Diamond Company, March 2021)
~2021Report
Approximate date — inferred from filename
This is the 2020 Aquatic Effects Monitoring Program (AEMP) Part 1 Annual Report Appendix A for the Ekati Diamond Mine, providing comprehensive tabular summaries of aquatic monitoring data collected from October 2019 to September 2020 across reference and monitored lakes and streams in five watersheds. The report documents physical limnology, water quality, sediment quality, plankton, benthos, and meteorological data collected under a reduced sampling program due to COVID-19 care and maintenance operations.
Aquatic Effects Monitoring (AEMP)Aquatics Water Quality
Environmental Agreement and Water Licence Annual Report Summary, Ekati Diamond Mine (Arctic Canadian Diamond Company, December 2020)
31 December 2020Report
This 2020 Environmental Agreement and Water Licence Annual Report Summary for the Ekati Diamond Mine documents Arctic Canadian Diamond Company's environmental management and monitoring activities during a year when the mine entered Care and Maintenance due to COVID-19. The report covers water quality monitoring across multiple watersheds, air quality and greenhouse gas emissions, wildlife effects monitoring, waste management, spills reporting, and reclamation research activities.
Monitoring Water Quality Air Quality
Aquatic Effects Monitoring Program (AEMP) 2020 Annual Report, Appendix B, Historical Water Quality, Ekati Diamond Mine (Arctic Canadian Diamond Company, December 2020)
31 December 2020Report
This is Appendix B of the 2020 Aquatic Effects Monitoring Program (AEMP) Annual Report for Ekati Diamond Mine, presenting historical lake water quality data from 1994 to 2020 for 48 water quality variables across reference lakes and monitored lakes in five watersheds, with graphical trends and detection limits.
Aquatic Effects Monitoring (AEMP)Water Quality Aquatics
Aquatic Effects Monitoring Program (AEMP) 2019 Annual Report, Agency Comments, Ekati Diamond Mine (Independent Environmental Monitoring Agency, December 2020)
2 December 2020Letter
The Independent Environmental Monitoring Agency reviews Dominion Diamond Mines' 2019 Ekati Aquatic Effects Monitoring Plan Annual Report and provides six recommendations addressing concerns about dissolved oxygen in Cujo Lake, elevated selenium levels in fish tissues downstream of mining facilities, and mercury benchmarks in the Fish Response Plan that may not adequately protect Indigenous fish harvesters.
Aquatics Aquatic Effects Monitoring (AEMP)Water Quality
Aquatic Effects Monitoring Program (AEMP) Action Level Exceedance Notification, Open-water 2020, Ekati Diamond Mine (Dominion Diamond, October 2020)
29 October 2020Letter
Dominion Diamond Mines notifies the Wek'èezhìi Land and Water Board of 2020 open-water Aquatic Response Framework Action Level exceedances: potassium at Leslie Lake (low Action Level) and total phosphorus at Cujo Lake (medium Action Level), with response plans submitted or pending.
Water Quality Aquatic Effects Monitoring (AEMP)Aquatics
Water Licence and Environmental Agreement Annual Report 2019, Plain Language Summary, Ekati Diamond Mine (Dominion Diamond, July 2020)
2 July 2020Report
Dominion Diamond Mines' 2019 Environmental Agreement and Water Licence Annual Report Summary documents the Ekati Diamond Mine's environmental management, monitoring, and compliance activities throughout 2019. The report covers mining operations, waste management, water quality, air quality, wildlife monitoring, reclamation efforts, and regulatory compliance across multiple watersheds in the Northwest Territories.
Monitoring Water Quality Air Quality
Aquatic Effects Monitoring Program (AEMP) 2019 Annual Report, Part 1, Evaluation of Effects, Ekati Diamond Mine (Dominion Diamond, June 2020)
1 June 2020Report
This 2019 Aquatic Effects Monitoring Program report evaluates environmental effects on aquatic ecosystems around the Ekati Diamond Mine across multiple watersheds, presenting comprehensive water quality, physical limnology, and biological data collected from lakes and streams with historical trend analysis and statistical evaluation against benchmarks.
Aquatic Effects Monitoring (AEMP)Aquatics Water Quality
Aquatic Effects Monitoring Program (AEMP) 2019 Annual Report, Part 2, Data Report (Volume 1 of 2), Ekati Diamond Mine (Dominion Diamond, June 2020)
1 June 2020Report
This is the 2019 Aquatic Effects Monitoring Program Part 2 Data Report for the Ekati Diamond Mine, documenting comprehensive aquatic environmental monitoring conducted from October 2018 to September 2019 across multiple watersheds and lakes. The report presents detailed field methods, sampling design, and tabular and graphical results for physical limnology, water quality, sediment quality, hydrology, phytoplankton, zooplankton, and benthic invertebrate communities.
Aquatic Effects Monitoring (AEMP)Aquatics Water Quality
Aquatic Effects Monitoring Program (AEMP) 2019 Annual Report, Part 4 Summary Report, Ekati Diamond Mine (Dominion Diamond, June 2020)
1 June 2020Report
The 2019 Aquatic Effects Monitoring Program (AEMP) Summary Report documents the results of aquatic ecosystem monitoring at the Ekati Diamond Mine across four watersheds and associated lakes, evaluating physical limnology, water quality, biological parameters, and hydrological conditions to detect mine-related effects. The report presents data collection methods, climatic and hydrological conditions for 2019, and summaries of evaluation of effects for the Koala, King-Cujo, Pigeon-Fay/Upper Exeter, and Horseshoe watersheds.
Aquatic Effects Monitoring (AEMP)Aquatics Water Quality

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821 documents · Page 5 of 42