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Chemical, physical, microbiological water properties, water-licence criteria

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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
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) 2018 Annual Report Addendum, Review Letter, Ekati Diamond Mine (Independent Environmental Monitoring Agency, February 2020)
18 February 2020Letter
The Independent Environmental Monitoring Agency confirms it has reviewed the 2018 AEMP Annual Report Addendum submitted by Dominion Diamond Mines ULC and is satisfied with clarifications provided, determining that a formal review is not necessary.
Correspondence Aquatic Effects Monitoring (AEMP)Water Quality
Aquatic Effects Monitoring Program (AEMP) 2020 Annual Report, Appendix C, Aquatic Response Framework, Ekati Diamond Mine (Arctic Canadian Diamond Company, January 2020)
~2020Report
Approximate date — inferred from filename
This 2020 Aquatic Effects Monitoring Program annual report presents the results of comparing water quality and biological data to Aquatic Response Framework Action Levels for the Ekati Diamond Mine. The document identifies Action Level exceedances for four water quality variables (dissolved oxygen, chloride, total potassium, total phosphorus) and four biological variables (phytoplankton biomass, phytoplankton density, phytoplankton community composition, zooplankton community composition), and provides detailed summaries of existing Response Plans and their status.
Aquatic Effects Monitoring (AEMP)Aquatics Water Quality Benthic Invertebrates
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
Surveillance Network Program (SNP) Monthly Report, Ekati Diamond Mine (Dominion Diamond, December 2019)
1 December 2019Report
Dominion Diamond Mines' Surveillance Network Program (SNP) monthly report for December 2019 under Water Licence W2012L2-0001, submitted to the Wek'èezhìi Land and Water Board, documenting water sampling results, flow measurements, containment facility volumes, minewater pumping quantities, and comprehensive analytical chemistry data from five water samples collected at Ekati monitoring stations.
SNP Water Quality Regulatory
Aquatic Effects Monitoring Program (AEMP) 2019 Re-evaluation, Part 2, Ekati Diamond Mine (Dominion Diamond, December 2019)
1 December 2019Report
This 2019 Aquatic Effects Monitoring Program (AEMP) re-evaluation report for Ekati Diamond Mine presents principal components analysis (PCA) of lake and stream benthos data, fish biology variables, and fish tissue metal concentrations collected from 1994–2018. The analysis integrates monitoring data to assess spatial and temporal trends in aquatic communities and identify potential mine-related environmental effects.
Aquatic Effects Monitoring (AEMP)Aquatics Benthic Invertebrates
Aquatic Effects Monitoring Program (AEMP) 2019 Re-evaluation, Appendix C, Statistical Results Part 1, Ekati Diamond Mine (Dominion Diamond, December 2019)
1 December 2019Report
This is Appendix C of the 2019 Aquatic Effects Monitoring Program (AEMP) Re-evaluation for Ekati Diamond Mine, containing comprehensive statistical results from principal components analysis of water quality, sediment quality, and biological communities (phytoplankton, zooplankton, benthos, and fish) across multiple monitoring sites and years from 1994-2018.
Aquatics Aquatic Effects Monitoring (AEMP)Water Quality
Aquatic Effects Monitoring Program (AEMP) 2019 Re-evaluation, Appendix E, Evaluation of Effects, Ekati Diamond Mine (Dominion Diamond, December 2019)
1 December 2019Report
This report presents a graphical analysis of 2018 Aquatic Effects Monitoring Program (AEMP) data for the Koala Watershed and Lac de Gras at Ekati Diamond Mine, evaluating water quality parameters including physical variables, ions, nutrients, and metals to determine mine-related environmental effects. The analysis identifies downstream spatial gradients and increasing trends in multiple parameters relative to reference sites, with effects extending varying distances from the Long Lake Containment Facility discharge point.
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
Surveillance Network Program (SNP) Monthly Report, Ekati Diamond Mine (Dominion Diamond, November 2019)
1 November 2019Report
Dominion Diamond Mines' Surveillance Network Program (SNP) monthly report for November 2019 under Water Licence W2012L2-0001, containing water quality sampling data, flow and volume measurements from multiple mine pits and containment facilities, and analytical results for physical parameters and metals from seven water samples collected at various monitoring stations around the Ekati Diamond Mine.
SNP Water Quality Monitoring
Waste Rock Storage Area (WRSA) Seepage Framework Discussion, Ekati Diamond Mine (Dominion Diamond, November 2019)
~2019Presentation
Approximate date — inferred from filename
Dominion Diamond Mines presents a framework for managing Waste Rock Storage Area (WRSA) seepage in response to a WLWB directive, proposing ecologically-derived thresholds and adaptive management action levels to replace Environmental Quality Criteria as the regulatory control for seepage monitoring and response.
Waste Rock Water Quality Regulatory Development Plans
Surveillance Network Program (SNP) Monthly Report, Ekati Diamond Mine (Dominion Diamond, September 2019)
1 September 2019Report
Dominion Diamond Mines' Surveillance Network Program monthly report for September 2019 under Water Licence W2012L2-0001, documenting 24 water samples collected from monitoring stations across the Ekati Diamond Mine with field parameters and comprehensive analytical results for physical, chemical, and metal constituents.
SNP Water Quality Monitoring
Seepage Survey Report, Reasons for Decision, Ekati Diamond Mine (Wek'èezhìı Land and Water Board, August 2019)
23 August 2019Regulatory Filing
The Wek'èezhìi Land and Water Board issued a decision on August 23, 2019 regarding Dominion Diamond Mines' 2018 Seepage Survey Report for the Ekati mine, approving discontinuance of summer rainfall sampling at Fox WRSA while directing substantial updates to the Waste Rock and Ore Storage Management Plan including tiered action levels, clarified receiving environment definitions, and enhanced adaptive management frameworks for seepage monitoring and response.
Waste Rock Water Quality Regulatory Monitoring
Aquatic Effects Monitoring Program (AEMP) Chloride Response Plan Version 2.1, Letter of Review, Ekati Diamond Mine (Independent Environmental Monitoring Agency, August 2019)
19 August 2019Letter
The Independent Environmental Monitoring Agency confirms it has reviewed Dominion Diamond Mines ULC's Chloride Response Plan version 2.1 and has no concerns with the plan as submitted.
Correspondence Water Quality Regulatory
Surveillance Network Program (SNP) Monthly Report, Ekati Diamond Mine (Dominion Diamond, August 2019)
1 August 2019Report
Dominion Diamond Mines' Surveillance Network Program (SNP) monthly report for August 2019 under Water Licence W2012L2-0001, documenting 30 water samples collected from various monitoring stations at Ekati Diamond Mine, with detailed field parameters, analytical results for metals, nutrients, and other water quality indicators, plus flow and volume measurements for water sources, discharges, and mining operations.
SNP Water Quality Monitoring

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