Closure & Reclamation

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

348 documents · Page 3 of 18

Documents

Sort

Wastewater and Processed Kimberlite Management Plan (WPKMP), Version 8.0, Ekati Diamond Mine (Dominion Diamond, September 2018)
10 September 2018Regulatory Filing
Dominion Diamond Ekati ULC submits Version 8.0 of the Wastewater and Processed Kimberlite Management Plan and a Panda/Koala Deposition Study to the Wek'èezhìi Land and Water Board, requesting approval to commence Fine Processed Kimberlite deposition into the Panda/Koala Processed Kimberlite Containment Area in early 2019, with updated site-wide management procedures incorporating the Jay and Misery Underground Projects.
Regulatory Water Licence Wastewater
Panda and Koala Deposition Study, Ekati Diamond Mine (Dominion Diamond, August 2018)
30 August 2018Report
This technical memorandum presents linked physical and chemical models for Panda, Koala North, and Koala pit lakes at the Ekati Diamond Mine to evaluate post-closure pit lake water quality following placement of fine processed kimberlite (FPK) and freshwater caps. The study investigates FPK consolidation, pore water release, inflow volumes, hydrodynamic mixing conditions, and predicts supernatant water quality over a 200-year post-closure period.
Closure & Reclamation Water Quality Waste Rock Development Plans
Interim Closure and Reclamation Plan (ICRP), Version 3.0, Part 1, Ekati Diamond Mine (Dominion Diamond, August 2018)
15 August 2018Regulatory Filing
Dominion Diamond Ekati ULC submits Interim Closure and Reclamation Plan Version 3.0 to the Wek'èezhìi Land and Water Board, updating the 2011 approved plan to incorporate the 2018 life-of-mine plan, new research findings, regulatory requirements, and closure strategies for all permitted disturbed areas at the Ekati Diamond Mine in the Northwest Territories, with operations scheduled to continue until 2035.
Closure & Reclamation Closure Plan Regulatory
Interim Closure and Reclamation Plan (ICRP), Version 3.0, Technical Memorandum on Effective Neutralization Potential, Ekati Diamond Mine (Dominion Diamond, August 2018)
14 August 2018Letter
Dominion Diamond Ekati ULC responds to a Wek'èezhìi Land and Water Board decision requiring investigation of effective neutralization potential (NP) of waste rock at the Ekati mine, submitting a technical memorandum by Golder Associates that outlines geochemical characterization methods and two ongoing programs to determine effective NP and address uncertainty in PAG/non-PAG rock classification.
Geochemistry Waste Rock Acid Rock Drainage
Interim Closure and Reclamation Plan (ICRP), Version 3.0, Part 2, Open Pits, Ekati Diamond Mine (Dominion Diamond, August 2018)
1 August 2018Report
This section of the Ekati Mine Interim Closure and Reclamation Plan (ICRP) Version 3.0 from August 2018 details closure objectives, criteria, and engineering works for open pits at the Ekati Diamond Mine. It presents pit-by-pit evaluations for constructing littoral zones to enhance ecological complexity in pit lakes, water quality modelling predictions, and community engagement outcomes regarding pit lake closure and reclamation strategies.
Closure & Reclamation Closure Plan Aquatics Traditional Knowledge
Waste Rock and Ore Storage Management Plan (WROMP), Version 9.0, Board Directive and Reasons for Decision, Ekati Diamond Mine (Wek'èezhìı Land and Water Board, June 2018)
27 June 2018Regulatory Filing
The Wek'èezhìi Land and Water Board approved Version 9.0 of Dominion Diamond Ekati ULC's Waste Rock and Ore Storage Management Plan and Version 2.0 of the Sable Waste Rock Storage Area Design Report on June 20, 2018, with conditions requiring revisions regarding East WRSA placement restrictions, geochemical uncertainty resolution, geotechnical stability confirmation, and technical corrections.
Waste Rock Regulatory Water Licence Acid Rock Drainage
Waste Rock and Ore Storage Management Plan (WROMP), Version 8.0, Board Directive and Reasons for Decision, Ekati Diamond Mine (Wek'èezhìı Land and Water Board, May 2018)
22 May 2018Regulatory Filing
The Wek'èezhìi Land and Water Board approved Version 8.0 of Dominion Diamond Ekati's Waste Rock and Ore Storage Management Plan and Version 2.0 of the Jay Road Construction Plan on May 17, 2018, with required revisions addressing uncertainties in the geochemical characterization of diabase rock discovered in the Lynx Pit and its suitability for construction use. The Board mandated a risk mitigation program including rock sampling, seepage monitoring, and additional geochemical analysis before diabase can be used as a construction material.
Waste Rock Regulatory Geochemistry
Waste Rock and Ore Storage Management Plan (WROMP), Version 9.0, Sable Waste Rock Storage Area Design Report, Ekati Diamond Mine (Dominion Diamond, April 2018)
26 April 2018Letter
Dominion Diamond Ekati ULC submits the Sable Waste Rock Storage Area Design Report Version 2.0 and Waste Rock and Ore Management Plan Version 9.0 to the Wek'èezhìi Land and Water Board for approval, proposing a 30 m setback distance from the Two Rock Sedimentation Pond and addressing Board concerns regarding adequate space for seepage monitoring and closure adaptive management actions.
Waste Rock Regulatory Development Plans Water Quality Closure & Reclamation
100th Board Meeting, Summary of Discussion, Ekati Diamond Mine (Independent Environmental Monitoring Agency, March 2018)
13 March 2018Meeting Minutes
The Independent Environmental Monitoring Agency held its 100th Board of Directors meeting on March 13-14, 2018 in Yellowknife to discuss ongoing monitoring projects, regulatory correspondence, and updates on Dominion Diamond operations including the Jay Project, Misery Underground, and other exploration activities at Ekati Diamond Mine.
Board Meetings Minutes Water Quality
Lake Sediment Literature Review, Interim Closure and Reclamation Plan (ICRP) Version 3.0, Ekati Diamond Mine (Dominion Diamond, March 2018)
1 March 2018Report
This literature review examines the suitability of stockpiled lake sediment from the Ekati Diamond Mine as a reclamation substrate for revegetating rock pads and tailings. The document synthesizes greenhouse trials, field studies, and long-term monitoring data (1995–2017) to assess lake sediment's physical and chemical properties, limitations, and potential when used alone or in combination with glacial till, topsoil, or processed kimberlite.
Closure & Reclamation Revegetation Waste Rock Monitoring
Three Year Seepage Report, Board Directive and Reasons for Decision, Ekati Diamond Mine (Wek'èezhìı Land and Water Board, January 2018)
25 January 2018Regulatory Filing
The Wek'èezhìi Land and Water Board approved Dominion Diamond Ekati ULC's 2016 Three-Year Seepage Survey Report (2014-2016) on January 25, 2018, and issued directives requiring submission of revised monitoring plans, waste rock management updates, and closure risk assessments with the 2017 Annual Seepage Report.
Regulatory Water Licence Waste Rock
98th Board Meeting, Summary of Discussion, Ekati Diamond Mine (Independent Environmental Monitoring Agency, September 2017)
14 September 2017Meeting Minutes
The Independent Environmental Monitoring Agency held its 98th Board of Directors meeting on September 12-14, 2017 in Yellowknife, including a site visit to Ekati Diamond Mine. The meeting covered presentations on the Misery Underground Project, WROMP 7.0 waste rock expansion, Fox Deep project, and the pending sale of Dominion Diamond Ekati Corporation to Washington Corp, along with discussions on water management, caribou crossings, waste rock facilities, and Agency administrative matters.
Board Meetings Minutes Development Plans Closure & Reclamation
Traditional Knowledge Management Framework, Measure 7-1, Jay Project Environmental Assessment, Ekati Diamond Mine (Dominion Diamond, May 2017)
16 May 2017Regulatory Filing
Dominion Diamond Ekati Corporation submits a Traditional Knowledge Management Framework to the Mackenzie Valley Environmental Impact Review Board in fulfillment of Measure 7-1 of the Jay Project Environmental Assessment, establishing protocols for collecting, storing, managing, and using Traditional Knowledge from affected Aboriginal groups to inform environmental decisions throughout the mine's lifetime.
Traditional Knowledge Regulatory Development Plans Closure & Reclamation
Jay Project Environmental Assessment (EA1314-01) Technical Reports, Multiple Parties (Diavik Diamond Mines, July to August 2015)
2015Letter
DDMI submits a technical report to the Mackenzie Valley Environmental Impact Review Board regarding the Jay Project environmental assessment, arguing that the proposed Jay Project would adversely affect DDMI's ability to operate and close the Diavik Mine by worsening water quality in Lac de Gras and reducing caribou use of the reclaimed mine site during the critical closure period (2023-2030).
Development Plans Water Quality Closure & Reclamation
Jay Project Technical Sessions, Mackenzie Valley Review Board (MVEIRB, April 2015)
20 April 2015Meeting Minutes
Technical sessions held April 20-24, 2015 for the Jay Project environmental assessment, featuring IEMA, Dominion Diamond, and regulatory participants discussing project alternatives, wildlife impacts, water quality modeling, fish habitat, air quality, and closure planning. The document includes detailed homework assignments, undertakings, and commitments from each day, followed by Information Request responses addressing environmental concerns related to mining alternatives, dike design, waste rock storage, water quality predictions, fish contaminants, and zooplankton dynamics.
Board Meetings Wildlife Water Quality
Project Description, Jay Project Developer's Assessment Report, Section 3 (Dominion Diamond, October 2014)
1 October 2014Report
This is Section 3 (Project Description) of Dominion Diamond's Developer's Assessment Report for the proposed Jay Project, submitted to the Mackenzie Valley Review Board in October 2014. It provides comprehensive technical details of the planned extension of the Ekati Diamond Mine through development of the Jay kimberlite pipe beneath Lac du Sauvage, including construction, operations, closure phases, geological and geotechnical characterization, and use of existing mine infrastructure.
Development Plans Closure & Reclamation Waste Rock Exploration
Environmental Agreement and Water Licence Annual Report 2013 (Dominion Diamond, April 2014)
24 April 2014Presentation
This 2013 Environmental Agreement and Water Licence Annual Report documents Dominion Diamond Ekati Corporation's compliance with regulatory requirements for the Ekati Diamond Mine, including water management, waste disposal, mining operations, environmental monitoring, and reclamation activities throughout the reporting year.
Regulatory Water Licence Environmental Agreement
WLWB Public Hearing — Lynx Project Water Licence & Land Use Permit, Ekati Diamond Mine (Multiple parties, February 2014)
6 February 2014Report
Public hearing proceedings (February 6-7, 2014) for Dominion Diamond Ekati Corporation's proposed Lynx Project water licence renewal and land use permit applications before the Wek'eezhii Land and Water Board, including presentations and interventions from IEMA, AANDC, Lutsel K'e Dene First Nation, Yellowknives Dene First Nation, and the proponent addressing water management, wildlife protection, closure planning, and regulatory compliance.
Regulatory Water Licence Water Quality
Modelling Predictions of Water Quality for Pit Lakes, Ekati Diamond Mine (BHP Billiton, November 2013)
2013Report
Ekati Diamond Mine Modelling Predictions of Water Quality for Pit Lakes (Panda, Beartooth, Koala, Koala North), prepared by Rescan Engineers & Scientists / Rescan Environmental Services Ltd. for Dominion Diamond Ekati Corporation, November 18 2013, submitted to Violet Camsell-Blondin (Chair, Wek'èezhii Land and Water Board, Yellowknife). Includes maximum ice-thickness range from nearby Contwoyto Lake (1.2-2.2 m) for natural-variability bounding, ΔSt salinity-stability parameter (30 J/m² and 10 J/m² scenarios) plots for Koala, Koala North, Beartooth, Panda pit-lake salinity vs depth, Comparison of Predicted Pit Wall Runoff and Groundwater with Observed Pit Sump Quality, and predicted Dissolved Aluminum, Arsenic, Chromium concentration projections 2006-2009.
Closure & Reclamation Water Quality Monitoring Regulatory
Revegetation Projects Annual Report 2012, Ekati Diamond Mine (Harvey Martens & Associates, July 2013)
19 July 2013Report
This annual report documents Dominion Diamond Ekati Corporation's 2012 revegetation and progressive reclamation activities at the Ekati Diamond Mine, including site amelioration work, monitoring of plant establishment at six reclamation sites, and research on plant species suitability for three major landscape types. The report presents findings on seedling survival, substrate materials assessment, and natural colonization of processed kimberlite.
Closure & Reclamation Revegetation Monitoring Traditional Knowledge

Tags

Documents