Closure & Reclamation

Mine closure plans, reclamation, abandonment, post-closure monitoring

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Waste Rock and Ore Storage Management Plan (WROMP), Version 12.0, Comments, Ekati Diamond Mine (Independent Environmental Monitoring Agency, December 2023)
20 December 2023Letter
The Independent Environmental Monitoring Agency submits detailed technical comments on Arctic Canadian Diamond Company's Waste Rock and Ore Management Plan v12.0 for the Ekati Mine, addressing concerns about Point Lake WRSA seepage monitoring, toe berm design, long-term seepage quality prediction, waste rock physical stability inspections, geochemical characterization methods, reference seep monitoring, and the identification and management of seeps of potential concern.
Waste Rock Acid Rock Drainage Water Quality
Comments on Interim Closure and Reclamation Plan (ICRP) Version 3.1, Ekati Diamond Mine (Independent Environmental Monitoring Agency, November 2023)
29 November 2023Letter
The Independent Environmental Monitoring Agency provides detailed comments and recommendations on Arctic Canadian Diamond Mine Ltd's Interim Closure and Reclamation Plan Version 3.1 (ICRP v3.1) for the Ekati Diamond Mine, addressing closure principles, long-term liability estimates, water quality criteria, waste rock management, pit lake reclamation, financial security, and adaptive management frameworks.
Closure & Reclamation Correspondence Post-Closure Monitoring
Annual Geotechnical Inspection Report, Ekati Diamond Mine (Arctic Canadian Diamond Company, October 2023)
24 October 2023Report
Burgundy Diamond Mines submits the 2023 Annual Geotechnical Inspection Report for the Ekati Diamond Mine to the Wek'èezhìi Land and Water Board as required by Water Licence W2020L2-0004. Tetra Tech inspected 14 water control structures from July 14-16, 2023, finding no visible signs of cracking or distress indicating instability, with recommendations for maintenance and monitoring of specific structures including Intermediate Dike C erosion repairs and King Pond Dam water elevation management.
Regulatory Water Licence Monitoring Wastewater Closure & Reclamation
Winter Road Construction Costs and Operational Data, Information Request Response, Ekati Diamond Mine (Arctic Canadian Diamond Company, October 2023)
13 October 2023Letter
The GNWT Department of Environment and Climate Change requests information from the Wek'èezhìı Land and Water Board regarding winter road construction costs and operational data from the three Joint Venture Winter Road operators to develop a cost estimate for mine reclamation and closure security purposes.
Closure & Reclamation Regulatory Correspondence Monitoring
Interim Closure and Reclamation Plan (ICRP) Version 3.1, Part 1, Ekati Diamond Mine (Arctic Canadian Diamond Company, August 2023)
9 August 2023Regulatory Filing
Arctic Canadian Diamond Company submits Interim Closure and Reclamation Plan (ICRP) Version 3.1 for the Ekati Diamond Mine to the Wek'èezhìi Land and Water Board, updating the 2018 version to incorporate the 2022 life-of-mine plan, Board-approved closure objectives, new research findings, and stakeholder feedback, with operations scheduled to continue until 2029.
Closure & Reclamation Regulatory Water Quality Traditional Knowledge Development Plans
115th Board Meeting, Summary of Discussion, Ekati Diamond Mine (Independent Environmental Monitoring Agency, February 2023)
13 February 2023Meeting Minutes
IEMA Board of Directors meeting held February 13-14, 2023 in Yellowknife covering agency business, officer appointments, financial reports, policy updates, and presentations from Tlicho Government on caribou monitoring and Arctic Canadian on Ekati mine operations. Directors reviewed ongoing monitoring plans, water licence renewal preparations, and communications initiatives.
Board Meetings Minutes Caribou Closure & Reclamation
Annual Water Licence Geotechnical Inspection (Government of the Northwest Territories, Environment and Climate Change, January 2023)
27 January 2023Report
Industrial water use inspection report for Ekati Diamond Mine (W2020L2-0004) conducted January 25-26, 2023 by GNWT Resource Management Officer Nahum Lee. The inspection found no major concerns across all inspected areas including Point Lake dewatering, waste facilities, fuel storage, and ammonium nitrate building, with all findings rated acceptable or not applicable.
Regulatory Water Licence Inspections Waste Rock Closure & Reclamation
Interim Closure and Reclamation Plan (ICRP) Version 3.1, Appendices A–D, Ekati Diamond Mine (Dominion Diamond, December 2022)
1 December 2022Report
This document is Appendix A-D of the Ekati Diamond Mine Interim Closure and Reclamation Plan Version 3.1 (December 2022), containing a comprehensive glossary of technical terms, acronyms, units of measure, a record of community and stakeholder engagement, and lessons learned from reclamation activities at Ekati and other northern mines.
Closure & Reclamation Waste Rock Water Quality
Interim Closure and Reclamation Plan (ICRP), Version 3.1, Part 2, Ekati Diamond Mine (Arctic Canadian Diamond Company, December 2022)
1 December 2022Report
This is the Ekati Diamond Mine Interim Closure and Reclamation Plan Version 3.1 (December 2022), a comprehensive regulatory document outlining the permanent closure and reclamation strategy for the Ekati mine, expected to continue operations until 2029. The plan presents site-wide closure objectives, criteria, and detailed reclamation approaches for seven planning areas including open pits, underground workings, waste rock storage areas, processed kimberlite containment facilities, water management infrastructure, and buildings/infrastructure, with emphasis on wildlife safety, caribou movement, ecosystem restoration, and community engagement.
Closure & Reclamation Closure Plan Waste Rock Revegetation
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 and Seepage Response Framework Version 1, Agency Comment Letter, Ekati Diamond Mine (Independent Environmental Monitoring Agency, August 2020)
19 August 2020Letter
The Independent Environmental Monitoring Agency provides detailed comments on the Ekati Diamond Mine Waste Rock and Ore Storage Management Plan Version 11 and Seepage Response Framework Version 1, recommending that neither document be approved in their current form. The letter identifies concerns regarding waste rock characterization methods, acid-base testing procedures, discontinuation of Sable waste rock sampling, diabase risk mitigation monitoring, and the adequacy of seepage threshold derivation and management approaches.
Waste Rock Acid Rock Drainage Geochemistry
Water Licence and Environmental Agreement Annual Report 2019, Ekati Diamond Mine (Dominion Diamond, July 2020)
2 July 2020Report
Dominion Diamond Mines ULC's 2019 Environmental Agreement and Water Licence Annual Report documents compliance with regulatory requirements for the Ekati Diamond Mine, including water management, waste disposal, environmental monitoring programs, and operational activities across multiple mine pits and containment facilities in the Northwest Territories.
Water Licence Regulatory Monitoring
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
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
Seepage Survey Report, Agency Comments, Ekati Diamond Mine (Independent Environmental Monitoring Agency, June 2019)
14 June 2019Letter
The Independent Environmental Monitoring Agency provides detailed comments on Dominion Diamond Mines' 2018 Seepage Survey Report, recommending establishment of a new reference station unimpacted by mine activities, clarification of 'receiving environment' definitions, development of an adaptive management framework for seepage, and addressing data gaps and uncertainties in waste rock storage monitoring.
Waste Rock Water Quality Monitoring Regulatory
Wastewater and Processed Kimberlite Management Plan (WPKMP), Version 9.0, Reasons for Decision, Ekati Diamond Mine (Wek'èezhìı Land and Water Board, June 2019)
13 June 2019Regulatory Filing
The Wek'èezhìi Land and Water Board approved Dominion Diamond Mines' Wastewater and Processed Kimberlite Management Plan (WPKMP) Version 9.0 on June 13, 2019, which addresses previous board direction and proposes reduced inspection frequency for processed kimberlite deposition into Panda and Koala pits. The decision includes requirements for closure and reclamation planning consistency with the approved Interim Closure and Reclamation Plan.
Regulatory Water Licence Wastewater
Wastewater and Processed Kimberlite Management Plan (WPKMP), Version 9.0, Ekati Diamond Mine (Dominion Diamond, March 2019)
22 March 2019Regulatory Filing
Dominion Diamond Mines submits Version 9.0 of the Ekati mine Wastewater and Processed Kimberlite Management Plan to the Wek'èezhìi Land and Water Board for approval, addressing previous directives and proposing changes to operational monitoring frequency at the Long Lake Containment Facility and Panda/Koala fine processed kimberlite pipeline, while incorporating closure and reclamation planning requirements.
Wastewater Waste Rock Kimberlite Tailings
Wastewater and Processed Kimberlite Management Plan (WPKMP) Version 8.0 and Panda Koala Deposition Study, Agency Comments, Ekati Diamond Mine (Independent Environmental Monitoring Agency, November 2018)
29 November 2018Letter
The Independent Environmental Monitoring Agency submits detailed comments on Dominion Diamond Ekati ULC's Wastewater Processed Kimberlite Management Plan version 8.0 and Panda Koala Deposition Study, recommending contingent approval of Panda and Koala pits as processed kimberlite containment areas pending confirmation of insufficient capacity in existing facilities and raising concerns about freshwater cap depth, monitoring frequency, ammonia/nitrate exclusion, and modelling assumptions.
Correspondence Waste Rock Kimberlite Tailings
101st Board Meeting, Summary of Discussion, Ekati Diamond Mine (Independent Environmental Monitoring Agency, September 2018)
19 September 2018Meeting Minutes
The 101st Board Meeting of the Independent Environmental Monitoring Agency (September 19-20, 2018) covered Agency business including reviews of regulatory submissions, communications updates, financial reporting, and presentations from Dominion Diamond and government representatives regarding Ekati mine operations, exploration activities, and closure planning.
Board Meetings Minutes Water Quality Aquatics Air Quality

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