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Aquatic Effects Monitoring Program (AEMP) Fish Response Plan Version 4.0, Comments, Ekati Diamond Mine (Independent Environmental Monitoring Agency, October 2025)
14 October 2025Letter
The Independent Environmental Monitoring Agency submits comments on Burgundy Diamond Mines' Fish Response Plan v4.0, raising concerns about elevated mercury and selenium levels in fish tissue downstream of mine facilities and recommending additional monitoring, studies, and stakeholder workshops to address potential risks to fish populations and future Indigenous subsistence fishing.
Aquatics Aquatic Effects Monitoring (AEMP)Correspondence
Aquatic Effects Monitoring Program (AEMP) Fish Response Plan, Version 4.0, Ekati Diamond Mine (Arctic Canadian Diamond Company, July 2025)
29 July 2025Report
Burgundy Diamond Mines submits the Aquatic Response Plan for Fish, Version 4.0, to address Action Level exceedances observed in 2024 for catch per unit effort and mercury and selenium concentrations in fish tissues in the Koala and King-Cujo watersheds at the Ekati Diamond Mine. The plan proposes response actions including studies on mercury bioaccumulation sources and methylmercury proportions in large-bodied fish tissues, and continued monitoring of mercury and selenium in water, sediment, and fish tissues.
Aquatic Effects Monitoring (AEMP)Aquatics Fish Habitat
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
Kodiak Lake Mercury Investigation, 2023 Annual Report Update, Ekati Diamond Mine (Arctic Canadian Diamond Company, July 2024)
1 July 2024Report
This report presents a comprehensive investigation of elevated mercury concentrations in large-bodied fish (lake trout and round whitefish) from Kodiak Lake at the Ekati Diamond Mine, including desktop analysis of historical monitoring data (1997–2018) and a 2023 field study of total and methylmercury in water and sediments. Key findings indicate that higher fish mercury concentrations are strongly correlated with wetland influences, elevated primary productivity, and Kodiak Lake's larger drainage area relative to reference lakes, rather than direct mine discharge.
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) Fish Response Plan Version 3.0, Reasons for Decision, Ekati Diamond Mine (Wek'èezhìı Land and Water Board, August 2022)
25 August 2022Regulatory Filing
The Wek'èezhìi Land and Water Board approved Version 3.0 of the Fish Response Plan for Ekati Diamond Mine on August 25, 2022, establishing action levels and response protocols for selenium and mercury in fish tissue, with site-specific human consumption screening values derived from Indigenous community surveys. The Board also directed Arctic Canadian Diamond Company to assess the Operational Water Management Strategy in relation to the updated Koala Watershed Model and to evaluate a retroactive mercury exceedance in Kodiak Lake in 2018.
Aquatics Aquatic Effects Monitoring (AEMP)Regulatory Traditional Knowledge
Aquatic Effects Monitoring Program (AEMP) Fish Response Plan Version 3.0, Comments, Ekati Diamond Mine (Independent Environmental Monitoring Agency, July 2022)
20 July 2022Letter
The Independent Environmental Monitoring Agency provides comments on Arctic Canadian Diamond Company's Response Plan for Fish Version 3.0, addressing concerns about mercury and selenium persistence in fish-bearing lakes, the exceedance of mercury action levels in Kodiak Lake, and the need to incorporate information about which fish organs are consumed by Indigenous communities into contaminant benchmarks.
Correspondence Aquatics Fish Habitat
Aquatic Effects Monitoring Program (AEMP) Fish Response Plan, Version 3.0, Ekati Diamond Mine (Arctic Canadian Diamond Company, May 2022)
24 May 2022Report
Arctic Canadian Diamond Company Ltd. submits Version 3.0 of the Response Plan for Fish to the Wek'èezhìi Land and Water Board, addressing low and medium action level exceedances for selenium and mercury in fish tissues at the Ekati Diamond Mine. The plan describes community engagement on fish consumption rates, evaluation of operational water management strategies, and proposes site-specific screening values for selenium and mercury in large-bodied fish.
Aquatics Aquatic Effects Monitoring (AEMP)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) Re-Evaluation Plan, Comments, Ekati Diamond Mine (Independent Environmental Monitoring Agency, March 2020)
12 March 2020Letter
The Independent Environmental Monitoring Agency provides detailed comments on Dominion Diamond Mines' Ekati Aquatic Effects Monitoring Plan (AEMP) Re-Evaluation Plan, recommending continued monitoring of harvestable fish species, increased sampling frequency for contaminants, improved sediment sampling methods, inclusion of sediment-based benchmarks in the Aquatic Response Framework, and retention of dustfall and meteorological data in AEMP reporting.
Aquatics Aquatic Effects Monitoring (AEMP)Fish Habitat
Interim Closure and Reclamation Plan (ICRP) Version 3.0, Decision Letter and Reasons for Decision, Ekati Diamond Mine (Wek'èezhìı Land and Water Board, February 2020)
19 February 2020Regulatory Filing
The Wek'èezhìi Land and Water Board's decision letter and detailed reasons approving Dominion Diamond Mines' Interim Closure and Reclamation Plan Version 3.0 for the Ekati Diamond Mine, with conditions requiring revisions, additional engagement, a workshop by November 2020, and adjustments to security deposits and reclamation planning timelines.
Closure & Reclamation Regulatory Water Licence Fish Habitat
Aquatic Effects Monitoring Program (AEMP) 2020–2022 Design Plan, Version 7.0, Appendix B, Ekati Diamond Mine (Dominion Diamond, December 2019)
15 December 2019Report
This document presents the proposed 2020 to 2022 Aquatic Effects Monitoring Program (AEMP) Design Plan Version 7.0 for the Ekati Diamond Mine, which consolidates monitoring across four geographic areas and incorporates the Aquatic Response Framework. The plan outlines comprehensive monitoring protocols for physical, chemical, and biological parameters in lakes and streams to detect mine-related effects on the aquatic environment.
Aquatic Effects Monitoring (AEMP)Aquatics Water Quality
Aquatic Effects Monitoring Program (AEMP) 2019 Re-evaluation, Part 1, Ekati Diamond Mine (Dominion Diamond, December 2019)
13 December 2019Report
This is the 2019 Aquatic Effects Monitoring Program (AEMP) Re-evaluation for the Ekati Diamond Mine, submitted by Dominion Diamond Mines ULC to the Wek'èezhìi Land and Water Board. The report presents multivariate analyses of 21 years of AEMP data, evaluates the effectiveness of current monitoring protocols, proposes 26 recommendations for the 2020-2022 AEMP Design Plan, and includes a re-evaluation of the Aquatic Response Framework to incorporate lessons learned and address Board directives.
Aquatic Effects Monitoring (AEMP)Aquatics Water Quality
Aquatic Effects Monitoring Program (AEMP) 2019 Re-evaluation, Appendix C, Statistical Results Part 2, Ekati Diamond Mine (Dominion Diamond, December 2019)
1 December 2019Report
This document is Appendix C (Part 2 of 2) of the 2019 Aquatic Effects Monitoring Program (AEMP) Re-evaluation for Ekati Diamond Mine, containing statistical results including principal components analysis of fish biology variables (age, length, weight, condition, growth) for lake trout, round whitefish, and slimy sculpin across multiple monitoring sites and years, as well as fish tissue metal concentrations and data availability assessments.
Aquatics Aquatic Effects Monitoring (AEMP)Monitoring
Aquatic Effects Monitoring Program (AEMP) 2019 Response Framework Re-evaluation, Appendix A, Response Framework Re-evaluation, Ekati Diamond Mine (Dominion Diamond, December 2019)
1 December 2019Report
This 2019 Aquatic Response Framework Re-evaluation for the Ekati Diamond Mine provides a comprehensive assessment of water quality, sediment quality, and biological monitoring variables, incorporating four years of implementation experience and Board directives. The document recommends updates to ARF benchmarks, removal of total manganese from water quality variables, revised reporting procedures for total phosphorus action level exceedances, and detailed analysis of sediment quality and selenium relationships to inform potential new action levels.
Aquatics Aquatic Effects Monitoring (AEMP)Water Quality Fish Habitat
Aquatic Effects Monitoring Program (AEMP) Fish Response Plan, Version 1.2, Reasons for Decision, Ekati Diamond Mine (Wek'èezhìı Land and Water Board, April 2019)
24 April 2019Regulatory Filing
The Wek'èezhìi Land and Water Board issued a Reasons for Decision on April 24, 2019 rejecting Dominion Diamond Mines' Ekati Aquatic Effects Monitoring Program (AEMP) Fish Response Plan Version 1.2, but establishing specific Medium and High Action Levels for selenium in fish tissue and directing submission of a revised Version 1.3 within 90 days with Medium and High Action Levels for all Low Action Level exceedances.
Aquatic Effects Monitoring (AEMP)Aquatics Regulatory
Aquatic Effects Monitoring Program (AEMP) Statistical Report 2018, Ekati Diamond Mine (Dominion Diamond, March 2019)
1 March 2019Report
Statistical analysis report of the 2018 Aquatic Effects Monitoring Program for Ekati Diamond Mine, presenting regression models and hypothesis tests comparing water quality, plankton, benthos, and fish parameters across monitored and reference lakes in the Koala, King-Cujo, Pigeon-Fay, and Upper Exeter watersheds from 1998-2018.
Aquatic Effects Monitoring (AEMP)Aquatics Water Quality
Aquatic Effects Monitoring Program (AEMP) 2018 Annual Report, Part 2, Data Report (Volume 3 of 4), Ekati Diamond Mine (Dominion Diamond, March 2019)
1 March 2019Report
This comprehensive 2018 Aquatic Effects Monitoring Program (AEMP) data report for the Ekati Diamond Mine presents detailed photographic documentation and analysis of fish health indicators (DELT assessments, parasites, cysts) across multiple lake species including round whitefish, lake trout, and slimy sculpin, along with baseline aquatic ecosystem data (1999–2017) for the Sable development area covering bathymetry, hydrology, water quality, sediment, plankton, benthos, and fish community parameters.
Aquatic Effects Monitoring (AEMP)Aquatics Monitoring
Aquatic Effects Monitoring Program (AEMP) 2018 Annual Report, Part 2, Data Report (Volume 4 of 4), Ekati Diamond Mine (Dominion Diamond, March 2019)
1 March 2019Report
Comprehensive Sable Aquatic Baseline Report documenting benthic invertebrate and fish community monitoring data collected from 1999 to 2017 in lakes and streams near the Ekati Diamond Mine in the Northwest Territories, including taxonomy, habitat assessment, tissue analysis, and quality assurance procedures.
Aquatics Benthic Invertebrates Monitoring Water Quality

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220 documents · Page 1 of 11