Closure & Reclamation

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

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Environmental Assessment Terms of Reference, Sable, Pigeon & Beartooth Pipes, Ekati Diamond Mine Extension (MVEIRB, December 1999)
13 December 1999Report
This document is the Environmental Assessment Terms of Reference issued by the Mackenzie Valley Environmental Impact Review Board on December 13, 1999, for BHP Diamonds Inc.'s proposed extension of the Ekati Diamond Mine through the development of Beartooth, Pigeon, and Sable kimberlite pits. The Terms of Reference specify the scope, methodology, and requirements for the Environmental Assessment Report, including assessments of physical, biological, and social-economic-cultural impacts, cumulative effects, public consultation, traditional knowledge integration, and closure and reclamation planning.
Development Plans Traditional Knowledge Environmental Agreement
Project Description, Proposed Development of Sable, Pigeon and Beartooth Kimberlite Pipes, Ekati Diamond Mine (BHP Billiton, October 1999)
1 October 1999Regulatory Filing
BHP Diamonds Inc. proposes to develop three additional kimberlite pipes (Sable, Pigeon, and Beartooth) at the Ekati Diamond Mine in the Northwest Territories to extend mine life from 15 to 18 years. The project description outlines mining methods, waste and water management strategies, infrastructure requirements, and environmental mitigation measures for the three new open pit operations, prepared in response to Mackenzie Valley Environmental Impact Review Board requirements and incorporating community consultation feedback.
Development Plans Waste Rock Wastewater
Board Briefing Package, 15th Board of Directors Meeting (IEMA, September 1999)
8 July 1999Meeting Minutes
Minutes from the 14th Board of Directors Meeting (July 8-11, 1999) and associated Members Meeting and Annual General Meeting of the Independent Environmental Monitoring Agency, documenting discussions on environmental monitoring at Ekati Diamond Mine, budget negotiations with BHP, traditional knowledge integration, cumulative effects assessment, community consultations, and agency staffing and operations.
Board Meetings Minutes Monitoring Closure & Reclamation Traditional Knowledge
Duthie Mine Acid Rock Drainage Case Study (Silver Standard Resources, June 1999)
24 June 1999Report
A comprehensive case study and historical inventory of the Duthie Mine in British Columbia, documenting its operational history from 1908 to 1988, mining production records, geological characteristics, tailings management, and water quality monitoring efforts. The document includes detailed MINFILE records of ore grades, commodity recoveries, and reclamation activities spanning multiple decades of ownership and operation.
Waste Rock Water Quality Closure & Reclamation Development Plans Monitoring Geochemistry
Environmental Agreement Annual Report 1998, Ekati Diamond Mine (BHP Billiton, April 1999)
30 April 1999Report
This is the 1998 Environmental Agreement Annual Report for the Ekati Diamond Mine, submitted by BHP Diamonds Inc. on April 30, 1999. The report documents the mine's transition from construction to full operational phase in October 1998, including comprehensive environmental monitoring results, compliance status with Water Licence N7L2-1616, and detailed accounts of wildlife, aquatic, air quality, and operational environmental management activities throughout 1998.
Environmental Agreement Monitoring Water Quality
Reclamation Cost Estimate for Closure in 1999, Ekati Diamond Mine (BHP Billiton, March 1999)
4 March 1999Report
This document provides a detailed reclamation cost estimate for the Ekati Diamond Mine assuming closure in 1999, broken down by reclamation unit (Panda Pit, Panda Waste Dump, Long Lake Containment Area, Buildings and Facilities, and Chemicals/Contaminated Soils), with a total estimated closure cost of $6,671,716 including 10 years of post-closure monitoring.
Closure & Reclamation Closure Plan Post-Closure Monitoring Development Plans
Project Description, Proposed Development of Sable, Pigeon & Beartooth Kimberlite Pipes, Ekati Diamond Mine (BHP Billiton, February 1999)
1 February 1999Regulatory Filing
BHP Diamonds Inc. proposes development of three additional kimberlite pipes (Beartooth, Pigeon, and Sable) at the Ekati Diamond Mine in the Northwest Territories, utilizing open pit mining methods and existing site infrastructure. The document details mining methods, waste rock and water management strategies, environmental impacts and mitigation measures, and reclamation plans including post-closure pit lake development for fisheries habitat replacement.
Development Plans Waste Rock Fish Habitat Wildlife
Review of Cover Design Technologies for the Reclamation of Tailings (G. Ward Wilson, University of Saskatchewan, 1999)
~1999Report
Approximate date — inferred from filename
This technical paper reviews cover design technologies for tailings reclamation across four distinct climate regimes (arid, temperate, high rainfall, and tropical monsoon) using numerical soil-atmosphere modeling. The analysis demonstrates that no single cover system design is universally applicable and that climate parameters, soil properties, and site-specific conditions must be integrated to achieve effective tailings containment and oxidation prevention.
Closure & Reclamation Waste Rock Acid Rock Drainage Kimberlite Tailings
Environmental Impact Assessment Guidelines, Section 3: Principles of Environmental Impact Assessment (MVEIRB, 1999)
~1999Report
Approximate date — inferred from filename
This document outlines the principles, history, and good practices of environmental impact assessment (EIA) under Canadian law and the Mackenzie Valley Resource Management Act. It explains EIA's role in predicting development impacts, emphasizes early public involvement and integration with project planning, and describes EIA as a tool for sustainable development in the Mackenzie Valley.
Development Plans Environmental Agreement Traditional Knowledge Regulatory Closure & Reclamation
Separate Fund Resolution Mediation Binder (IEMA, 1999 to 2008)
1999–2008Email
Email transmitting meeting minutes and dispute documentation regarding the interpretation of IEMA's Separate Fund usage under the Resolution Agreement, specifically whether the fund covers only public hearings or broader regulatory processes including plan and report reviews for water licence approvals at Ekati Diamond Mine.
Environmental Agreement Correspondence Regulatory Closure & Reclamation
Panda Diversion Channel Monitoring Program Technical Report, Ekati Diamond Mine (BHP Billiton, January 1999)
1999Report
Panda Diversion Channel (PDC) Monitoring Program 1998 Technical Report (Final, January 1999, BHP Diamonds Inc. — Stream Habitat Compensation Program). Prepared by Dillon Consulting Limited for BHP Diamonds Inc. (Project 98-5275-01-01) and submitted to J.N. Stein, Manager Habitat Management Division, Department of Fisheries and Oceans (501 University Crescent). Includes Table 7.3 Summary of Benthos Communities (stations GC-H1 / Grizzly Creek and DC-H1 through DC-H9 along the Panda Diversion Channel), Table 7.4 Invertebrate Taxa by Functional-Feeding Groups (Collector-Gatherer, Collector-Filterer, Predator, with Heterotrissocladius and other taxa), and photographic documentation rolls.
Fish Habitat Aquatic Effects Monitoring (AEMP)Monitoring Closure & Reclamation Regulatory
Independent Environmental Monitoring Agency, 12th Board of Directors Meeting Package (IEMA, February 1999)
11 December 1998Meeting Minutes
Minutes from the 11th Board of Directors Meeting of the Independent Environmental Monitoring Agency (December 11-12, 1998) documenting discussions on federal and BHP responses to the Agency's annual report, project amendments, traditional knowledge integration, cumulative effects monitoring, and organizational matters including budget and staffing.
Board Meetings Minutes Aquatics Closure & Reclamation
Operating Environmental Management Plan, Ekati Diamond Mine (BHP Billiton, December 1998)
1 December 1998Report
BHP's Operating Environmental Management Plan for the Ekati Diamond Mine outlines comprehensive environmental management strategies and monitoring programs for the operational phase of the mine in the Northwest Territories, covering mining operations, mineral processing, waste management, wildlife protection, air quality, and aquatic life management across an anticipated 25-year operational period.
Development Plans Air Quality Wildlife
Ekati, Canada's First Diamond Mine, Special Grand Opening Edition (News/North, October 1998)
12 October 1998Report
This special newspaper edition celebrates the grand opening of Ekati Diamond Mine on October 14, 1998, Canada's first operational diamond mine, highlighting its construction completion on budget at $700 million, employment of 440 staff with aboriginal hiring preference, and comprehensive environmental monitoring program in the Lac de Gras area near Yellowknife.
Development Plans Monitoring Closure & Reclamation Wildlife Water Quality
Ekati Canada's First Diamond Mine, Grand Opening Special Edition (News/North, October 1998)
12 October 1998Report
A special newspaper edition celebrating the grand opening of Ekati, Canada's first diamond mine, on October 14, 1998, operated by BHP Diamonds Inc. and Dia Met Minerals. The document contains extensive congratulatory messages from northern suppliers and service providers, articles detailing the mine's operations, environmental practices, employment of northern and aboriginal workers, telecommunications infrastructure, and the 25-year development history of the project near Lac de Gras in the Northwest Territories.
Development Plans Exploration Closure & Reclamation Wildlife Water Quality
"If We Wait and See, It Will Be Too Late": Critique of Approach to Environmental Management by Voisey's Bay Nickel Company (Innu Nation, October 1998)
~1998Regulatory Filing
Approximate date — inferred from filename
This is a formal submission by Innu Nation to an environmental assessment panel hearing on the proposed Voisey's Bay Nickel Mine, critiquing the adequacy of environmental impact prediction, assessment of alternatives, and the sufficiency of relying on monitoring to address serious uncertainties about mining impacts on traditional Innu lands and harvesting rights.
Traditional Knowledge Environmental Agreement Waste Rock
Guidelines for Metal Leaching and Acid Rock Drainage (ML/ARD) at Minesites in British Columbia (BC Ministry of Energy and Mines, August 1998)
1 August 1998Report
British Columbia Ministry of Energy and Mines guidelines for predicting, preventing, and mitigating metal leaching and acid rock drainage (ML/ARD) at minesites, establishing a phased approach to characterization, prediction, and mitigation strategies including underwater storage, blending, covers, and drainage treatment.
Acid Rock Drainage Waste Rock Geochemistry
Guidelines for Metal Leaching and Acid Rock Drainage at Minesites in British Columbia (BC Ministry of Energy and Mines, August 1998)
1 August 1998Report
British Columbia Ministry of Energy and Mines guidelines document providing comprehensive requirements and best practices for predicting, preventing, and mitigating metal leaching and acid rock drainage at mining sites, including prediction methodologies, mitigation strategies, and regulatory frameworks.
Acid Rock Drainage Waste Rock Geochemistry
Policy for Metal Leaching and Acid Rock Drainage at Minesites in British Columbia (BC Ministry of Energy and Mines & Ministry of Environment, Lands and Parks, July 1998)
1 July 1998Report
This British Columbia policy establishes regulatory requirements and guiding principles for managing metal leaching and acid rock drainage (ML/ARD) at minesites. It prescribes a three-step prediction and mitigation process and outlines various strategies including avoidance, underwater storage, covers, blending, and drainage collection and treatment.
Acid Rock Drainage Waste Rock Geochemistry
Lake Fish-Out Program, Misery Lake Data Report (BHP Billiton, June 1998)
1 June 1998Report
This report documents the 1997 fish-out program at Misery Lake conducted by Rescan Environmental Services for BHP Diamonds Inc. in preparation for lake drainage and open pit mining development. A total of 146 lake trout were captured and removed using gill nets over 21 days of fishing, with biological data collected on size, weight, condition, and reproductive status to comply with fisheries authorization requirements.
Fish Habitat Aquatics Monitoring

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