Closure & Reclamation

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

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NWT Diamonds Project Environmental Impact Statement, Additional Information Response Part C (BHP Billiton, January 1996)
1 January 1996Regulatory Filing
BHP's Additional Information Response to Part C of the NWT Diamonds Project Environmental Impact Statement addresses 17 panel questions and information gaps identified during the EIS review, covering spillway functions, water flow patterns, wildlife management, off-road vehicle policies, employment and socio-economic impacts, chemical effects of flocculants and ferrosilicon, and various technical clarifications on mine operations and closure.
Development Plans Water Quality Closure & Reclamation Waste Rock
Resource Documents Binder (IEMA, 1996 to 1997)
1996–1997Report
Independent Environmental Monitoring Agency (IEMA) Resource Documents binder — Table of Contents includes the Environmental Agreement Implementation Protocol, NWT Water Board Water Licence for BHP Authorization for Works or Undertakings, and detailed Closure-Plan content prescriptions covering sedimentation ponds, borrow pits, ore storage stockpiles, surface structures (process plant, camps, roads, airstrip), petroleum and chemical storage, post-closure groundwater contamination assessment and monitoring, revegetation, surface drainage channel stability over reclaimed tailings, and restoration research. Plus May 6 1997 IEMA Implementation Group draft minutes (Ted Blondin Dogrib Treaty 11 Council, Rachel Crapeau, Clem Paul, Terry Janes — GeoNorth letter drafting action).
Environmental Agreement Closure & Reclamation Regulatory
Samatosum Mine Acid Rock Drainage Case Study (BHP Billiton, 1996)
~1996–2001Report
A case study examining drainage treatment and mitigation strategies at the Samatosum mine, detailing measures to limit leaching from waste rock dumps and tailings, including costs and long-term monitoring requirements for managing acid rock drainage and sludge disposal.
Waste Rock Acid Rock Drainage Geochemistry Monitoring Closure & Reclamation
Tailings Management Plan, NWT Diamonds Project (EBA Engineering, December 1995)
15 December 1995Report
This tailings management plan for the BHP Diamonds Project describes the design and operation of a 133-million-tonne tailings disposal system using Long Lake basin in the Northwest Territories, including perimeter dams, intermediate dykes, water management strategies, and long-term reclamation to restore the site to a wetland environment.
Waste Rock Kimberlite Tailings Closure & Reclamation
Air Quality Monitoring Program Records, Ekati Diamond Mine (BHP Billiton, 1995 to 2005)
1 December 1995Regulatory Filing
This document is BHP Billiton's December 1995 response to the panel's request for additional information on monitoring programs for the NWT Diamonds Project (Ekati), detailing adaptive management criteria, thresholds, and monitoring sensitivity for water, land, air, wildlife, and socioeconomic parameters, along with establishing an independent Environmental Advisory Group. The second section (dated March 2004) presents Rescan Environmental Services' proposal to update the EKATI air dispersion model using ISC3, incorporating current meteorological data, terrain, emissions inventories, and cumulative effects assessment with the Diavik mine.
Development Plans Monitoring Water Quality Waste Rock
Alternatives to Accelerate Pit Water Infilling, EIS Additional Information Request 16 (BHP Billiton, December 1995)
~1995Regulatory Filing
Approximate date — inferred from filename
This document provides BHP's response to a panel request for alternatives to accelerate water infilling of mined-out open pits at the Ekati Diamond Mine, discussing options such as waste rock backfilling, tailings deposition, and surface water diversion, along with their environmental and economic trade-offs for each pit.
Development Plans Closure & Reclamation Aquatics
Monitoring Programs (EIS Additional Information, Section 15) (BHP Billiton, 1995)
~1995Regulatory Filing
Approximate date — inferred from filename
This document is the proponent's detailed response to regulatory panel requests for information on environmental and socioeconomic monitoring programs for the NWT Diamonds Project. It outlines comprehensive monitoring plans for water quality, wildlife, air, land, permafrost, and socioeconomic parameters; describes the establishment of an independent Environmental Advisory Group; and addresses post-closure monitoring commitments and adaptive management thresholds.
Monitoring Water Quality Development Plans
Waste Management Plans, Additional Information Response to Panel Information Request 603a, Ekati Diamond Mine (BHP Billiton, December 1995)
~1995Regulatory Filing
Approximate date — inferred from filename
This document is a detailed response to a regulatory panel's information requests regarding waste management plans for the Ekati Diamond Mine, specifically addressing tailings management, water treatment facilities, nitrogen contamination from ANFO explosives, dam failure scenarios, and waste rock drainage control. The response includes engineering designs for a Long Lake tailings facility with sequential cells, water clarification methods tested during bulk sampling, contingency plans for dam failures, and management practices to minimize ammonia losses from explosive use.
Waste Rock Wastewater Water Quality Regulatory
Tailings Dams Preliminary Design Report, NWT Diamonds Project (EBA Engineering, December 1995)
1 December 1995Report
EBA Engineering Consultants prepared preliminary designs for tailings dams and associated earthworks at the NWT Diamonds Project located 300 km northeast of Yellowknife, featuring four perimeter dams around Long Lake using frozen core technology to retain water and tailings, with extensive thermal and stability analyses to ensure permafrost integrity over a 25-year operational period.
Development Plans Waste Rock Closure & Reclamation Monitoring
NWT Diamonds Project Tailings Management Plan and Preliminary Design of Retention Structures (EBA Engineering, December 1995)
1 December 1995Report
This comprehensive tailings management plan prepared by EBA Engineering Consultants for BHP Diamonds describes the disposal strategy for 133 million tonnes of kimberlite tailings over 25 years of mine operation at the NWT Diamonds Project. The plan details the use of Long Lake basin for tailings storage in five sequential cells, with perimeter dams featuring permafrost cores, intermediate filter dykes, water clarification techniques, and progressive reclamation to restore the landscape to a stable, vegetated wetland environment.
Kimberlite Tailings Waste Rock Closure & Reclamation
Baseline Information on Permafrost, EIS Additional Information Section 8 (BHP Billiton, 1995)
~1995Regulatory Filing
Approximate date — inferred from filename
This document responds to a regulatory panel request for baseline information on permafrost conditions at the BHP Diamonds (Ekati) project. It describes existing permafrost data collected since 1993 through boreholes, thermistor cables, and ground-penetrating radar surveys, confirms permafrost thickness of 230–280 m, identifies future geotechnical investigation needs for secondary structures, and documents minor thermally induced ground instability encountered during exploration and construction.
Monitoring Development Plans Regulatory Closure & Reclamation
Conformity Review of the BHP Diamond Mine Environmental Impact Statement (EIS) (Nunavut Tunngavik Inc., October 1995)
24 October 1995Regulatory Filing
Nunavut Tunngavik Inc. submits a detailed critique of BHP's Environmental Impact Statement for the proposed diamond mine at Lac de Gras, arguing the EIS is deficient in water quality analysis, post-closure monitoring plans, and consultation with Kitikmeot Inuit regarding land claims and compensation agreements under the Nunavut Land Claims Agreement.
Development Plans Water Quality Traditional Knowledge Wildlife
Conformity Report, NWT Diamonds Project Environmental Impact Statement (GNWT, October 1995)
23 October 1995Regulatory Filing
The Government of the Northwest Territories' conformity review of the BHP NWT Diamonds Project Environmental Impact Statement, identifying major deficiencies in traditional knowledge integration, environmental management plans, spatial boundaries, wildlife assessment, socio-economic impacts, and monitoring programs, while concluding that the EIS can be brought into compliance relatively quickly through additional analysis and field work results.
Development Plans Regulatory Traditional Knowledge
Conformity Comments on BHP Diamond Mine Environmental Impact Statement (Nunavut Tunngavik Incorporated, October 1995)
23 October 1995Report
Nunavut Tunngavik Inc. (NTI) submits conformity comments on the BHP Diamond Mine Environmental Impact Statement, asserting that the EIS is deficient in water quality analysis, long-term post-closure monitoring, and consultation with Kitikmeot Inuit regarding land claim rights and potential water impacts to the Coppermine River. NTI recommends the panel require BHP to answer supplemental questions and initiate compensation negotiations with the Kitikmeot Inuit Association before proceeding to public hearings.
Development Plans Correspondence Traditional Knowledge Closure & Reclamation Regulatory
Response to the BHP/Diamet Environmental Impact Statement (Northern Environmental Coalition (NEC), October 1995)
23 October 1995Regulatory Filing
The Northern Environmental Coalition's comprehensive response to the BHP/Diamet Environmental Impact Statement for the proposed Ekati Diamond Mine identifies significant omissions and deficiencies across five major areas: biological impacts, cumulative effects, reclamation, socio-economic impacts, and traditional knowledge. The response critiques the EIS for inadequate treatment of wildlife management, water quality monitoring, fish habitat protection, and failure to conduct true cumulative effects assessment.
Development Plans Wildlife Aquatics
Conformity Review of the Environmental Impact Statement, NWT Diamonds Project (Natural Resources Canada, October 1995)
19 October 1995Regulatory Filing
Natural Resources Canada's conformity review of BHP Diamonds Inc.'s Environmental Impact Statement for the proposed NWT Diamonds Project, identifying deficiencies primarily related to permafrost and ground ice effects on mine design, tailings stability, reclamation feasibility, and economic impact analysis. The review concludes the EIS is partially conforming and sufficient to proceed to hearings despite identified minor deficiencies.
Development Plans Regulatory Waste Rock
Conformity Review of the BHP NWT Diamonds Project Environmental Impact Statement (Natural Resources Canada, October 1995)
19 October 1995Regulatory Filing
Natural Resources Canada's conformity review of the Environmental Impact Statement for BHP Diamonds Inc.'s NWT Diamonds Project identifies partial conformity to guidelines, with deficiencies primarily related to permafrost and ground ice effects on tailings stability, reclamation feasibility, and long-term environmental impacts. The review concludes the EIS is sufficient to proceed to hearings but recommends addressing gaps in understanding of permafrost behavior, availability of reclamation materials, contingency planning, and monitoring protocols.
Development Plans Closure & Reclamation Waste Rock
Comments on BHP Environmental Impact Statement (Parlee McLaws (o/b/o City of Yellowknife), October 1995)
17 October 1995Letter
The City of Yellowknife submits comments on the BHP Environmental Impact Statement regarding the proposed diamond mine project, expressing concerns about incomplete analyses of population growth, employment patterns, infrastructure capacity, social services impacts, and closure planning. The letter identifies gaps in the EIS regarding worker accommodation, drug and alcohol problems, waste handling, and the lack of benefit analysis for northern communities.
Development Plans Correspondence Regulatory Closure & Reclamation Waste Rock
Comments on BHP Environmental Impact Statement (Parlee McLaws (for City of Yellowknife), October 1995)
17 October 1995Letter
City of Yellowknife provides comments on the BHP Environmental Impact Statement for the proposed Ekati Diamond Mine, identifying concerns about labour patterns, population growth analysis, accommodation capacity, closure impacts, and socioeconomic effects on the city during construction, operations, and post-closure phases.
Development Plans Correspondence Regulatory Closure & Reclamation Waste Rock
Response to BHP, DiaMet Environmental Impact Statement (Northern Environmental Coalition (NEC), October 1995)
1995Regulatory Filing
Response by Ecology North and the Northern Environmental Coalition (NEC) to the BHP / DiaMet Environmental Impact Statement, October 23 1995 (26 pages, transmitted via World Wildlife Fund / WWF). Identifies deficiencies in the EIS regarding the ecosystem approach, esker mining for road material and esker rehabilitation, lemmings and voles, land claims and Aboriginal self-government, and the omission of cumulative environmental impacts of the proposed BHP NWT diamond mine.
Development Plans Regulatory Wildlife

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