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Aquatic Effects Monitoring Program (AEMP) Design Plan Version 8.1, Proposed Changes, Reasons for Decision, Ekati Diamond Mine (Wek'èezhìı Land and Water Board, July 2025)
10 July 2025Regulatory Filing
The Wek'èezhìı Land and Water Board approved proposed revisions to the Ekati AEMP Design Plan Version 8.1 on July 9, 2025, allowing sediment quality and benthic invertebrate sampling to be conducted in 2025 rather than 2026, and removing the requirement for non-lethal Slimy Sculpin sampling in 2025. The Board also directed that Slimy Sculpin CPUE be reflected in the Aquatic Response Framework variables in the December 2025 submission.
Aquatic Effects Monitoring (AEMP)Aquatics Benthic Invertebrates
Aquatic Effects Monitoring Program (AEMP) Design Plan Version 8.1, Changes, Ekati Diamond Mine (Independent Environmental Monitoring Agency, June 2025)
30 June 2025Letter
The Independent Environmental Monitoring Agency reviews and comments on proposed changes to the Aquatic Effects Monitoring Program (AEMP) Version 8.1, supporting the acceleration of sediment and invertebrate sampling to 2025 and the removal of non-lethal Slimy Sculpin sampling in 2025, given that Low Action Level thresholds have been met.
Aquatics Aquatic Effects Monitoring (AEMP)Benthic Invertebrates
Aquatic Effects Monitoring Program (AEMP) Design Plan Version 8.1, Proposed Changes, Ekati Diamond Mine (Arctic Canadian Diamond Company, June 2025)
6 June 2025Letter
Burgundy Diamond Mines proposes two changes to the Ekati Mine Aquatic Effects Monitoring Program (AEMP) Design Plan Version 8.1 under Water Licence W2022L2-0001: to conduct sediment quality and benthic invertebrate sampling in 17 AEMP lakes in 2025 rather than 2026 to align with MDMER Cycle 2 EEM requirements, and to discontinue non-lethal Slimy Sculpin sampling in 2025 because mine-related effects have now been conclusively demonstrated and sufficient data has been collected.
Aquatics Aquatic Effects Monitoring (AEMP)Benthic Invertebrates
Aquatic Effects Monitoring Program (AEMP) Re-evaluation Report and Point Lake Development AEMP Design Plan, Comments, Ekati Diamond Mine (Independent Environmental Monitoring Agency, February 2023)
28 February 2023Letter
The Independent Environmental Monitoring Agency submits detailed comments on Arctic Canadian Diamond Company's 2022 Aquatic Effects Monitoring Program Re-evaluation Report and Point Lake Development AEMP Design Plan for the Ekati mine, raising concerns about data analysis methodology, fish sampling protocols, benthic invertebrate classification, metal monitoring in food chains, and nutrient-phytoplankton relationships.
Aquatics Aquatic Effects Monitoring (AEMP)Water Quality
Aquatic Effects Monitoring Program (AEMP) Re-evaluation Report, Ekati Diamond Mine (Arctic Canadian Diamond Company, December 2022)
15 December 2022Report
This 2022 Aquatic Effects Monitoring Program (AEMP) Re-evaluation report for the Ekati Diamond Mine presents a comprehensive assessment of aquatic monitoring data collected since 1998, including multivariate analyses integrating physical, chemical, and biological data, and provides 10 recommendations for the 2023-2025 AEMP Design Plan. The report evaluates the effectiveness of the AEMP in detecting environmental changes, compares observed effects against Environmental Assessment predictions, and proposes updates to the Aquatic Response Framework based on four years of implementation experience.
Aquatic Effects Monitoring (AEMP)Aquatics Water Quality
Aquatic Effects Monitoring Program (AEMP) Re-evaluation 2022, Appendices, Ekati Diamond Mine (Arctic Canadian Diamond Company, December 2022)
15 December 2022Report
This document presents the 2022 Aquatic Response Framework (ARF) re-evaluation for the Ekati Diamond Mine, incorporating lessons learned since 2015 implementation and addressing regulatory directives. It proposes six recommendations including adding total iron and removing total vanadium from water quality variables, updating action levels for biological variables to require mine-related effect conclusions, and clarifying response procedures when action level exceedances are not mine-related.
Aquatic Effects Monitoring (AEMP)Aquatics Water Quality Monitoring
Aquatic Effects Monitoring Program (AEMP) 2021 Annual Report, Reasons for Decision, Ekati Diamond Mine (Wek'èezhìı Land and Water Board, July 2022)
19 July 2022Regulatory Filing
The Wek'èezhìi Land and Water Board approved Arctic Canadian Diamond Company's 2021 Aquatic Effects Monitoring Program (AEMP) Annual Report on July 19, 2022, with specific directions for future submissions regarding pH measurements, ammonia sampling methods, sediment sampling procedures, arsenic baseline data, chlorophyll a benchmarks, and Slimy Sculpin population trends.
Aquatic Effects Monitoring (AEMP)Water Quality Aquatics Benthic Invertebrates
Aquatic Effects Monitoring Program (AEMP) 2021 Annual Report, Review and Comments, Ekati Diamond Mine (Independent Environmental Monitoring Agency, May 2022)
30 May 2022Letter
The Independent Environmental Monitoring Agency reviews Arctic Diamond's 2021 Ekati Aquatic Effects Monitoring Program Annual Report, identifying concerns about persistent potassium action level exceedances in Leslie Lake, elevated selenium in fish tissues near the Long Lake Containment Facility discharge, and recommending expanded integration of traditional knowledge into monitoring programs.
Aquatic Effects Monitoring (AEMP)Aquatics Water Quality
Aquatic Effects Monitoring Program (AEMP) Part 1 Annual Report, Appendix A, 2021 Data Report, Ekati Diamond Mine (Arctic Canadian Diamond Company, March 2022)
1 March 2022Report
This is the 2021 Aquatic Effects Monitoring Program (AEMP) Part 1 Annual Report, Appendix A: 2021 Data Report for the Ekati Diamond Mine. It provides comprehensive tabular summaries and data from monitoring conducted October 2020 to September 2021 across multiple lakes, streams, and watersheds, including hydrology, water quality, sediment quality, plankton, benthos, and small-bodied fish monitoring, with associated quality assurance/quality control results and meteorological data.
Aquatic Effects Monitoring (AEMP)Aquatics Water Quality
Aquatic Effects Monitoring Program (AEMP) Part 2 Statistical Report, Ekati Diamond Mine (Arctic Canadian Diamond Company, March 2022)
1 March 2022Report
This is the 2021 Aquatic Effects Monitoring Program (AEMP) Part 2 Statistical Report for the Ekati Diamond Mine, presenting statistical analysis methods and results for water quality, sediment quality, phytoplankton, zooplankton, benthos, and fish populations across three watersheds (Koala, King-Cujo, and Horseshoe) and associated lakes. The report details regression modelling approaches, hypothesis testing procedures, and comprehensive results comparing monitored sites to reference sites to detect potential mine-related environmental effects.
Aquatic Effects Monitoring (AEMP)Aquatics Water Quality
Aquatic Effects Monitoring Program (AEMP) Annual Report 2021, Part 1, Ekati Diamond Mine (Arctic Canadian Diamond Company, March 2022)
1 March 2022Report
The 2021 Aquatic Effects Monitoring Program (AEMP) Annual Report for the Ekati Diamond Mine documents the results of comprehensive aquatic ecosystem monitoring across three watersheds (Koala, King-Cujo, and Horseshoe) and associated downstream lakes. The report evaluates mine-related effects on physical limnology, water quality, sediment quality, and aquatic biology, identifying multiple mine-related changes in water chemistry and plankton communities downstream of discharge facilities, with several Action Level exceedances requiring response plans.
Aquatic Effects Monitoring (AEMP)Aquatics Water Quality Benthic Invertebrates
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
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) 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
Aquatic Effects Monitoring Program (AEMP) 2019 Annual Report, Part 2, Data Report (Volume 2 of 2), Ekati Diamond Mine (Dominion Diamond, June 2020)
1 June 2020Report
This is the 2019 Aquatic Effects Monitoring Program (AEMP) Part 2 Data Report for the Ekati Diamond Mine, documenting comprehensive environmental sampling and monitoring across multiple lakes, streams, and watersheds in the Northwest Territories. The report details field methods, data analysis, and results for meteorology, hydrology, physical limnology, water quality, and sediment quality monitoring conducted throughout 2019.
Aquatics Aquatic Effects Monitoring (AEMP)Water Quality
Aquatic Effects Monitoring Program (AEMP) 2019 Annual Report, Part 3 Statistical Report, Ekati Diamond Mine (Dominion Diamond, June 2020)
1 June 2020Report
This is the 2019 Aquatic Effects Monitoring Program Part 3 Statistical Report for the Ekati Diamond Mine, presenting comprehensive statistical analyses of water quality, phytoplankton, zooplankton, and benthos data collected from multiple watersheds and lakes. The report details regression modelling methods, hypothesis testing procedures, and results comparing monitored sites to reference sites across the Koala, King-Cujo, Pigeon-Fay, Upper Exeter, and Horseshoe watersheds.
Aquatic Effects Monitoring (AEMP)Aquatics Water Quality

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125 documents · Page 1 of 7