Final Closure and Final Closure and Reclamation Plan for Reclamation Plan for

Nanisivik MineNanisivik Mine

By Patrick Duxbury, By Patrick Duxbury,

Nunavut Water BoardNunavut Water Board

Mine Reclamation CoordinatorMine Reclamation Coordinator

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OverviewOverview wlq8i4 ttC3ymJ5wlq8i4 ttC3ymJ5

• Background to Final Plan

• Content of the Final Plan

• Proposed Review• Public Hearing

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Final Plan BackgroundFinal Plan Background rao6]Xu4 X6NAt5 ckwoz4mzb rao6]Xu4 X6NAt5 ckwoz4mzb

• CanZinco submitted initial Closure Plan in February, 2002

• Nunavut Water Board hearing held in Arctic Bay in July, 2002

• Nanisivik Mine closed in September, 2002

• CanZinco required to re-submit Closure and Reclamation Plan under new water licence

• Final Plan submitted February 2004

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Content of Final PlanContent of Final Plan ttC6bq ]b2fx5 rao6]X5 X6NAt5ttC6bq ]b2fx5 rao6]X5 X6NAt5

• Covers Design Report• Talik Investigation Report• Quarries Report• WTDA Spillway Design

Report• Rock Piles and Open Pits

Closure Plan• Monitoring Plan• Environmental Site

Assessment• West Twin Disposal Area

Closure Plan• Underground Disposal Plan• Landfill Closure Plan• Main Document

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Proposed Reclamation Proposed Reclamation ActivitiesActivities

West Twin Disposal Area (“WTDA”)West Twin Disposal Area (“WTDA”)

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Reclamation Goal for WTDAReclamation Goal for WTDA nl3m3n3bsizk5 gCZsJ5 nl3m3n3bsizk5 gCZsJ5

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1. Minimize risk of acid rock drainage and metal leaching

2. Provide a safe environment that resembles natural conditions

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Reclamation ApproachReclamation Approach nl7m3n3bsli ckwozix3mz5nl7m3n3bsli ckwozix3mz5

• To provide a cover over tailings in Surface Cell/Test Cell

• To provide a stable water cover over tailings in the Reservoir

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• Majority of surface cell is covered with thin shale layer

• Unfrozen area (“talik”) exists in Surface Cell

• CanZinco has investigated talik properties

• Freeze back of talik is expected, however deformations on the surface may occur

• 7-8 years to freeze down to base of dike

• 28-30 years for complete freezing to bottom of lake

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• Talik exists under Test Cell due to water cover

• Test Cell is connected to Reservoir underneath dykes

• Deformations during freeze back are not likely

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Reclamation of Surface and Test Cell AreaReclamation of Surface and Test Cell Area nl7m3n3bsiz czk5 cspn3=4 nl7m3n3bsiz czk5 cspn3=4

1. Removal of residual surface water

2. Preparation of the tailings surface

3. Placement of 1.0m of shale

4. Placement of 0.25m of Twin Lakes sand & gravel

5. Installation of monitoring equipment

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Surface Cell SpillwaySurface Cell Spillway czb cspn3=s5 ]f4=4nzczb cspn3=s5 ]f4=4nz

• Required to permit water to flow from Surface Cell to Reservoir

• Designed to handle major flood events

• Lower portion constructed when Reservoir has been lowered

• Upper portion to be constructed after grading of Surface Cell

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• Will undergo monitoring to assess stability

• Will be sloped where necessary to provide extra stability

• Dike faces will be capped with at least 0.25 m of Twin Lakes sand and gravel

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Reservoir / Polishing PondReservoir / Polishing Pond wmc6=sJ6 F nlm6nw=4 byC6wmc6=sJ6 F nlm6nw=4 byC6

• Will be reclaimed by restoring the water level to natural outlet elevation (2m lower than present)

• Tailings will be relocated 1m below waterline to prevent oxidation or wave-action

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1. Lower water to 2 m below final water level

2. Relocate tailings from high spots and bank areas

3. Place rip rap cover at the tow of the dikes

4. Breach East Twin Lake access road to permit flood events

5. Breach dike to permit flood events

6. Remove outlet structure and build new channel

7. Construct lower section of the Spillway

8. Allow natural runoff to fill to pond

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East Twin LakeEast Twin Lake wu3b3=4 by6wu3b3=4 by6

• Fresh water pumping station will be removed

• Access road will be breached to permit flood events

• Diversion channel will be kept in place

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Other FacilitiesOther Facilities xyq nNymJ5xyq nNymJ5

• Piping system will be removed and either sold or placed underground

• Emergency dump pond liners will be removed and gravel berms will be graded

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Water QualityWater Quality wu6 cktQ3izwu6 cktQ3iz

• Water at outlet of the polishing pond will be tested during monitoring phase to assess reclamation effectiveness

• Company’s prediction indicate that water will remain close to natural conditions

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Landfill FacilityLandfill Facility x4b6=4 wlxlx4b6=4 wlxl

Reclamation ApproachReclamation Approach nl7m3nwi6j5 xg3Dm/q5nl7m3nwi6j5 xg3Dm/q5

• Cap landfill to permanently freeze waste materials in permafrost

• Monitor site after capping to assess water quality below landfill, ground temperatures and physical condition

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Reclamation of Landfill FacilityReclamation of Landfill Facility nl7m3n3bsiz x4b6=4nl7m3n3bsiz x4b6=4

1. Relocate fuel contaminated soil to underground mine workings

2. Grade surface to build a gentle slope

3. Construct 1.95m thick shale cover

4. Construct 0.25m thick Twin Lakes sand and gravel layer

5. Groom the surface6. Monitoring

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Rock Pits and Open PitsRock Pits and Open Pits s/C4b6=sifw5 x7ml vt5t=sifw5s/C4b6=sifw5 x7ml vt5t=sifw5

Approach to ReclamationApproach to Reclamation xg3bsJmJ6 nl7m3nwi6j5xg3bsJmJ6 nl7m3nwi6j5

• Minimize the risk of acid-rock drainage; and

• Provide a safe environment that matches the natural conditions

• Waste rock is to be gathered and placed in open pits

• Covers similar to the landfill to be used

• Large quantities of waste rock already disposed of underground

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West Adit AreaWest Adit Area sxozzi wMQx6ymiz n8N=4sxozzi wMQx6ymiz n8N=4

• Includes:– West Open Pit– 01S Portal Area– Rock piles– Road from the

Industrial Complex

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Reclamation of West Adit AreaReclamation of West Adit Area nl7m3n3bsiz sxozzi wMQx6ymiz n8N=4nl7m3n3bsiz sxozzi wMQx6ymiz n8N=4

1. Relocate waste rock from 09S rock pile to West Open Pit

2. Fill in West Open Pit with demolition debris

3. Relocate waste rock from 02S pile and place at north wall of West Open Pit

4. Build cover over buried materials in West Open Pit

5. Build a light vehicle road into the final surface

– Note: Small quantity of material may be left due to safety risk

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East Adit AreaEast Adit Area wMQx6ymiz n8N=4wMQx6ymiz n8N=4

• Includes:– East Open Pit– 39N/S rock pile– East Trench

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Reclamation of East Adit AreaReclamation of East Adit Area nl7m3n3bsli r?tzi wMQx6ymiz n8N=4nl7m3n3bsli r?tzi wMQx6ymiz n8N=4

1. Place approximately 4,500 m3 from the rock pile into the East Trench

2. Place remaining rock into the East Open Pit

3. Cover both areas with shale and sand/gravel cap

4. Provide for continued light vehicle transportation

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• Remaining waste rock to be placed into pit

• Metal contaminated soil to be placed at portal

• Cover pit and portal with shale and sand and gravel cap

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• Approximately 4,000m3 of waste rock is on surface, this will be place in East Open Pit

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Area 14Area 14 n8N=4n8N=4 14 14

• Large portion of waste rock has already been reclaimed

• Remaining material to be consolidated

• Shale/sand & gravel cover to be used

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QuarriesQuarriess/C4b6]=5s/C4b6]=5

QuarriesQuarries s/C4b6]=5s/C4b6]=5

• During reclamation the following quarries are to be used:– Road Quarry– Landfill Quarry– Shale Hill– Mount Fuji– Area 14– West Twin– East Twin– East/West Twin Delta

• After use, quarries will be cleaned of debris and graded

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Industrial StructuresIndustrial Structures n8N=sJ5 N2X6ymJ5n8N=sJ5 N2X6ymJ5

Industrial ComplexIndustrial Complex n8N=sJ6 w[l6Jx]Cl4n8N=sJ6 w[l6Jx]Cl4

• Contains mill, power plant, maintenance shops, offices

• Building and equipment sold to Wolfden Resources

• Building materials and equipment will be sorted and shipped away or disposed of

• Concrete foundations to be cleaned and covered with shale/sand & gravel cover

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ANFO Facility ANFO Facility ANFO ANFO WoE=zWoE=z

• The two buildings and 1000 L fuel tank will be dismantled, decontaminated and placed underground

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Concentrate Storage BuildingConcentrate Storage Building n=4nk5 g5d6ym=4 w[l6Jx]Cl4n=4nk5 g5d6ym=4 w[l6Jx]Cl4

• Includes truck weight scales, conveyors and ship loader

• Infrastructure has been purchased by Wolfden Resources

• Concrete floor to be swept clean and covered by 0.5m of shale and then graded

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• Steel shipping containers used currently for storage will be shipped away or dispose of

• Small wooden buildings around mine will be burned and disposed of underground

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Town SiteTown SitekNosJ5 w[l6Jxc6=zkNosJ5 w[l6Jxc6=z

Town SiteTown Site kNosJ5 w[l6Jxc6=zkNosJ5 w[l6Jxc6=z

• Buildings and infrastructure belong to CanZinco, as well as Federal government and GN

• Bunkhouse, Pama Building and CanZinco houses will be burnt and hauled underground

• Dome and ice rink will be dismantled, burnt and placed underground

• Church will be dismantled and removed

• Carpenter shop and emergency power plant will be dismantled and sold or disposed underground

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Fuel StorageFuel Storage s6hc6]=5 g5d6ym=qs6hc6]=5 g5d6ym=q

Tank Farm and Dock AreaTank Farm and Dock Area s6hc6]=5 x7ml gM4b6=4s6hc6]=5 x7ml gM4b6=4

• Transfer to a third party is likely

• If not, tanks will be cleaned and dismantled by contractor

• Waste product to be shipped south for disposal

• CanZinco will remediate soils contaminated by fuel in the area

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Day Tanks and Fueling StationsDay Tanks and Fueling Stations s6hcst5 x7ml s6n4nw=5 s6hcst5 x7ml s6n4nw=5

• Three large tanks at industrial complex will be removed, decontaminated and ship out or disposed of underground

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End User TanksEnd User Tanks s3hcst=i5 xgD8i3g5s3hcst=i5 xgD8i3g5

• There have been a number of end use tanks around the mine site including:– At West Open Pit– A WTDA– At ANFO facility– At Refuge stations– Town site

• All tanks will be emptied, removed, sold or decontaminated and disposed of underground

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Industrial Complex Yard AreaIndustrial Complex Yard Area n8N=4Jx]Cl4 w[l6Jxc6=4 kNbz x?tzin8N=4Jx]Cl4 w[l6Jxc6=4 kNbz x?tzi

• Includes “bone yard”, cold and warm storage buildings and outdoor warehouse yard

• Remaining equipment will be decontaminated and disposed of underground

• There is considerable soil contamination in this area which will be reclaimed

• Soil contaminated by fuel will be placed underground

• Metal contaminated soil from Industrial Complex will be buried under the proposed shale/sand & gravel cover

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Other AreasOther Areas xyq WoE=sJ5xyq WoE=sJ5

StolportStolportu5b6==i6u5b6==i6

• Originally used as landing strip for exploration activities

• Small quantity metal and fuel contaminated soil to be excavated and placed underground

• NorthwestTel responsible for removal of their equipment

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Dock AreaDock Area gM4b6=4gM4b6=4

• Reclamation of dock infrastructure is duty of Federal Government

• Metal and fuel contaminated soil in dock area will be excavated and stored underground by CanZinco

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RoadbedsRoadbeds x2dt5 r4oq5x2dt5 r4oq5

• Roads servicing dock, airport, East Twin Lake and the town site belong to the Government of Nunavut

• Metal contaminated soil is present between dock area and Industrial Complex.

• Contaminated soil will be excavated and placed either underground or buried in Industrial Complex area

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Underground OpeningsUnderground Openings kNs5 wlxkx3=5kNs5 wlxkx3=5

• There are eight openings to the main underground workings in addition to portals at Oceanview, K-Baseline and Area 14

• Portals will be buried with rock to prevent access and then contoured

• Raises to the surface will be backfilled and sealed

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East Adit Treatment FacilityEast Adit Treatment Facility

r?tzi wMQx6ymiz nlm6nw=4 WoE5Jt5r?tzi wMQx6ymiz nlm6nw=4 WoE5Jt5 • Metal contaminated

soil at the facility will be removed into the underground

• After Water Board approval, dikes will be breached to permit natural drainage

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ChemicalsChemicals wM4nw5wM4nw5

Mill ChemicalsMill Chemicals n=4nos6=4u wM4nw5n=4nos6=4u wM4nw5

• Amounts left at site are small

• Chemicals that represent an environmental risk will be shipped off site

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Other ChemicalsOther Chemicals xyq wM4nw5xyq wM4nw5

• Explosives chemicals will be sent back to supplier or to other operations

• Salts used in mining will be returned to supplier or used in other operations

• Paints, cleaning supplies will be returned to supplier to be disposed off site

• Laboratory chemicals will be neutralized, destroyed or removed from the site

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Contaminated SoilContaminated Soil hD6N6ic6g5 gxXw5hD6N6ic6g5 gxXw5

Contaminated SoilContaminated Soil hD6N6ic6g5 gxXw55hD6N6ic6g5 gxXw55

• Large quantities of contaminated soil will be handled

• There is approximately56 950 m3 of fuel, or metal and fuel contaminated soil

• There is approximately32 590m3 of metal contaminated soil

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MonitoringMonitoring cspnw8N3i6cspnw8N3i6

ObjectiveObjective gCZsJ5gCZsJ5

• Identify immediate needs for site management and environmental protection

• Assess performance of reclamation measures

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Monitoring PeriodsMonitoring Periods cspnw8N3bsiz xfistQizcspnw8N3bsiz xfistQiz

• Reclamation Period (2 years, 2004-2005)

• Closure Period (5 years, 2006-2010)

• Monitoring period is “open-ended”

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Types of MonitoringTypes of Monitoring cspn3i5 ckw5giq5cspn3i5 ckw5giq5

• Water Quality Monitoring to address:– Twin Lakes Creek

Watershed– Chris Creek Watershed– East Adit Treatment Facility

(before and after reclamation)

– Oceanview Watershed– Landfill Watershed

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Types of MonitoringTypes of Monitoring ckw5giq5 cspn3i5ckw5giq5 cspn3i5

• Geothermal Monitoring– To assess the

behavior of engineered covers

• Confirmatory Soil Sampling– To define areas of

contamination

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Types of MonitoringTypes of Monitoring ckw5giq5 cspn3bsJ5ckw5giq5 cspn3bsJ5

• Stability of Earth Structures– Annual inspection by

professional engineer in August/September

• West Twin and Test Cell Dikes

• West Twin Spillway• West Twin Reservoir

Outlet• Pit Covers• Landfill Cover

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Review and ReportingReview and Reporting NlNw6g6iz x7ml gn6ys5JbsizNlNw6g6iz x7ml gn6ys5Jbsiz

• Quarterly reports and annual reports to be filed

• In 2010 a Comprehensive Assessment report will be required.

• If site is proved to be “environmentally stable” then CanZinco will not be required to conduct further monitoring

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Review of Final PlanReview of Final Plan NlNw6gZsiz rao6xX6ys5 X6NA5NlNw6gZsiz rao6xX6ys5 X6NA5

• Full Review will commence with submission of plans

• Technical reviews expected from:– Government of Nunavut– Indian and Northern Affairs

Canada– Nunavut Tunngavik

Incorporated– Environment Canada– Fisheries and Oceans

Canada– Internal review

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Water Board Hearing ProcessWater Board Hearing Process wmoEp5 vtmpq xW6hwi6j5 WoE5JyqwmoEp5 vtmpq xW6hwi6j5 WoE5Jyq

• Technical Meeting to be likely held in April

• Future community visits by staff

• Proposed Hearing to be held in early May

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