CON MI NE CON MI NE CON MI NE CON MI NE CLOSURE & RECLAMATI - - PowerPoint PPT Presentation

CON MI NE CON MI NE CON MI NE CON MI NE CLOSURE & RECLAMATI ON CLOSURE & RECLAMATI ON CLOSURE & RECLAMATI ON CLOSURE & RECLAMATI ON PLAN OVERVI EW PLAN OVERVI EW

February 2 2 February 2 2 nd

nd, 2 0 0 7

, 2 0 0 7

C t St t f th Cl & R l ti Pl C t St t f th Cl & R l ti Pl Current Status of the Closure & Reclamation Plan Current Status of the Closure & Reclamation Plan

All sections of the plan (with the exception of the reclamation All sections of the plan (with the exception of the reclamation

cost estimate) have been reviewed by the Con Mine A&R Working Group set up by the MVLWB in 2003

The Working Group has met ~ 20 times over the past 4 years to

discuss technical details of the proposed reclamation plan for th C Mi it the Con Mine site

The Working Group provided recommendations on each

g p p section of the Plan that led to Miramar revising each section prior to submission to the MVLWB

St t f th C Mi Cl & R l ti Pl St t f th C Mi Cl & R l ti Pl Status of the Con Mine Closure & Reclamation Plan Status of the Con Mine Closure & Reclamation Plan

Three public information sessions (open house style) were held Three public information sessions (open house style) were held

in 2005/06 to present the content of each Section to the public and to elicit feedback

In December of 2006 the MVLWB completed their review of all

sections of the Reclamation Plan (except the reclamation cost ti t ) estimate);

The Board has given conditional approval to each section

g pp indicating what changes were needed to satisfy the MVLWB.

Miramar has revised the Plan to incorporate these changes and Miramar has revised the Plan to incorporate these changes and

formally re-submitted the Plan to the MVLWB at the end of January 2007 for final Board approval

St t f th C Mi Cl & R l ti Pl St t f th C Mi Cl & R l ti Pl Status of the Con Mine Closure & Reclamation Plan Status of the Con Mine Closure & Reclamation Plan

The MVLWB Board staff have indicated that this revised The MVLWB Board staff have indicated that this revised

version of the Plan will be sent to the Working Group for one final review to confirm that the Board’s conditions have been met – this meeting met this meeting.

Once the Plan is approved, Miramar will implement the Plan

t ti i 2007 ith t h i l l ti k starting in 2007, with most physical reclamation work completed by the end of 2009. Water treatment and post closure monitoring and maintenance will continue at least through 2031 through 2031.

Leased land held by Miramar can be returned to the GNWT

starting in 2007.

St t f th R l ti C t E ti t St t f th R l ti C t E ti t Status of the Reclamation Cost Estimate Status of the Reclamation Cost Estimate

Miramar submitted a revised reclamation cost estimate to the Miramar submitted a revised reclamation cost estimate to the

MVLWB in December of 2007. R i d t ti t i $12 5 illi t i l di k

Revised cost estimate is $12.5 million, not including work

completed through 2006.

~60% of this cost is direct physical reclamation while 40% is for

• ngoing water treatment and post closure monitoring and

maintenance.

MVLWB has asked INAC to review this cost estimate and

provide the Board advice regarding any revision to reclamation provide the Board advice regarding any revision to reclamation security levels.

Status of the Reclamation Cost Estimate Status of the Reclamation Cost Estimate Status of the Reclamation Cost Estimate Status of the Reclamation Cost Estimate

• Miramar currently has $10.0 million in security set aside for

reclamation of the Con Mine reclamation of the Con Mine

– $9.0 million in an environmental trust set aside for reclamation from the sale of the Bluefish hydro facility pledged to INAC under the Water License – $1.0 million in a second trust set aside for reclamation from the sale of the Bluefish hydro facility Bluefish hydro facility

• Miramar estimates that it will spend an additional $4 million on final

reclamation in 2007. Consequently by the end of 2007, the amount q y y , held in two reclamation trusts will exceed the remaining estimated reclamation liability

• Final clean up and treatment of the remaining arsenic sludges through
• Final clean up and treatment of the remaining arsenic sludges through

the autoclave is scheduled for completion by September of 2007 leading the way for mill demolition in late 2007 – early 2008.

St ct e of the Con Mine Clos e & St ct e of the Con Mine Clos e & Structure of the Con Mine Closure & Structure of the Con Mine Closure & Reclam ation Plan Reclam ation Plan

Table of Contents Table of Contents d i d i 1 .I ntroduction and History 2 .Site I nfrastructure and Facilities 3 .Underground W orkings 4 .Rat Lake 5 .Con Pond and Negus Pond 6 .Tailing Containm ent Areas ( TCA’s) 6 .Tailing Containm ent Areas ( TCA s) 7 .Contam inated Soils 8 .W ater Managem ent 9 Closure and Post Closure Site Monitoring 9 .Closure and Post Closure Site Monitoring 1 0 .Cost Sum m ary and Schedule

Public I nform ation Session # 1 - Held - June 1 5 th, 2 0 0 5 Sections Covered: 1 . I ntroduction and History 2 Sit I f t t d F iliti 2 . Site I nfrastructure and Facilities 3 . Underground W orkings 4 . Rat Lake Public I nform ation Session # 2 -Held October 2 6 th, 2 0 0 5 Sections Covered: 5 . Con Pond and Negus Pond 6 T ili C t i t A ( TCA’ ) 6 . Tailing Containm ent Areas ( TCA’s) – Historic Areas – Recently Active Areas ( Upper and Middle Pud) Public I nform ation - Session # 3 - Held March 1 6 th, 2 0 0 6 Sections Covered: 7 . Contam inated Soils 8 W t M t 8 . W ater Managem ent 9 . Closure and Post Closure Site Monitoring

• The key reclam ation objective is to return the

m inesite to a viable, and w herever practicable, self- i i sustaining ecosystem

• End land use objective is a m ix of land suitable for

j industrial use m ixed w ith open space

• Areas not im pacted by m ining could be used for other
• Areas not im pacted by m ining could be used for other

purposes pending appropriate setbacks Th ill b th it d i t d h d

• There w ill be three sites designated as hazardous

sites ( Con and Negus Ponds and the hazardous m aterials storage site) that w ill be capped and thus not available for future land use not available for future land use

S ifi R l i Obj i S ifi R l i Obj i Specific Reclam ation Objectives Specific Reclam ation Objectives

Progressive Reclam ation activities started in 2 0 0 2

• Progressive Reclam ation activities started in 2 0 0 2
• Mill area to be reclaim ed to a standard suitable for

future industrial land use

• Sim ilarly the Shops/ Office/ Roads/ Parking areas

Sim ilarly the Shops/ Office/ Roads/ Parking areas to be reclaim ed to industrial land use standard

• Historic Tailing Areas to be drained contoured and
• Historic Tailing Areas to be drained, contoured and

revegetated – 3 5 hectares

• Upper and Middle Pud TCA’s to be covered w ith 5 0

to 6 0 cm of rock and vegetated – 5 0 hectares

Section 1 Section 1 - I ntroduction I ntroduction Section 1 Section 1 I ntroduction I ntroduction History and Reclam ation History and Reclam ation Obj ti Obj ti Objectives Objectives

• No Com m ents received from

No Com m ents received from MVLW B and the W orking Group. MVLW B and the W orking Group. MVLW B and the W orking Group. MVLW B and the W orking Group.

Section 2 Section 2 I nfrastructure and Facilities I nfrastructure and Facilities Section 2 Section 2 - I nfrastructure and Facilities I nfrastructure and Facilities

• All buildings on Site are to be rem oved, w ith potentially

3 exceptions: 3 exceptions:

• Masonic Lodge
• One private residence
• Recreation Hall
• Exceptions subject to approval of the land ow ner ( GNW T) -

copies of letters from these 3 interested parties have been subm itted to W ater Board.

• A procedure has been added that deals w ith the

assessm ent of concrete foundations for contam inants. A d i th l f th ti b d

• A procedure covering the rem oval of the tim ber and

concrete crib at the boiler house at the Con dock has been added ( Section 2 .7 ) . This procedure references DFO guidance to m onitor the w ork to protect fish and i b i i l f h d il d k g com m its to obtaining DFO approval of the detailed w ork plan prior to proceeding.

Mill Comple Mill Complex x Mill Comple Mill Complex x – July 2005 2005 July 2005 2005 Mill l Mill l t t t Mill l Mill l t t t Mill Comple Mill Complex x Mill Comple Mill Complex x – July 2005 2005 July 2005 2005 Mill Mill comp complex ex at t pr presen esent. Mill Mill comp complex ex at t pr presen esent.

Mill Comple Mill Complex x Mill Comple Mill Complex x – 2008 Pr 2008 Projecti

• jection
• n

2008 Pr 2008 Projecti

• jection
• n

Mill comple Mill complex r remo moved d Mill comple Mill complex r remo moved - d -

• 2008

2008 2008 2008

Section 3 Section 3 Underground Underground Section 3 Section 3 - Underground Underground

• Mining ceased Septem ber 2 0 0 3 . Monitoring of w ater

level and quality in m ine has been carried out tw ice level and quality in m ine has been carried out tw ice since then.

• I n 2 0 0 6 , a procedure w as developed to m onitor

i ( l l d li ) l b i hi m inew ater ( level and quality) on an annual basis. This procedure is set out in detail in Sections 8 and 9 . I nitially the m inew ater w ill be m onitored at a m inim um frequency of once each year, w ith the results reported q y y , p to MVLW B and I NAC. I nform ation w ill be m ade public.

• I n the sum m er of 2 0 0 6 w ater w as m easured to at the

4 7 0 0 foot level At current flooding rates w ater is 4 7 0 0 foot level. At current flooding rates w ater is expected to equalize near surface in 2 0 1 4 .

• Capping of shafts and raises in progress.

Capping of shafts and raises in progress.

Section 4 Section 4 Rat Lake Rat Lake Section 4 Section 4 - Rat Lake Rat Lake

• The m ajority of the Rat Lake sedim ents w ere evaluated in

2 0 0 3 .

• A further ~ 2 ,0 0 0 cubic m eters w ere rem oved in 2 0 0 5 .
• The ‘Rat Lake W ork Plan’ that detailed w hat w as done and
• The Rat Lake W ork Plan that detailed w hat w as done and

w hat results w ere obtained to the end of 2 0 0 5 , has been subm itted to the MVLW B ( January 2 0 0 7 ) .

• The last 1 0 0 cubic m eters of contam inated m aterial w as
• The last 1 0 0 cubic m eters of contam inated m aterial w as

rem oved in Septem ber 2 0 0 6 and the tests results from that w ork are pending ( report to be subm itted to the MVLW B in March 2 0 0 7 ) .

• The Reference to the YASRC is added.
• MCML has included in the Plan com m itm ents # 1 0 ,1 6 and 1 7 .

S ti 4 1 d 4 2 Section 4 .1 and 4 .2 .

Section 5 Section 5 Con and Negus Ponds Con and Negus Ponds Section 5 Section 5 - Con and Negus Ponds Con and Negus Ponds

• Arsenic sludges have been rem oved and stockpiled in

g p the Blend Plant for treatm ent in the Autoclave. The Autoclave w ill be com m issioned in April 2 0 0 7 and rem ain in service until all of the arsenic sludges have been treated.

• Con Pond has been cleaned and pow er w ashed to

recover the rem aining arsenic sludges.

• Cleaning of the Negus Pond w ill be com pleted in 2 0 0 7 .

As the gravel and boulders are rem oved, they w ill be w ashed and the w ash w ater w ill go to the Autoclave as w ashed and the w ash w ater w ill go to the Autoclave as feed for the treatm ent of the arsenic sludges. Any gravel or boulders that have total arsenic over 3 4 0 m g/ kg on the surface of the rock w ill be placed in the hazardous w aste disposal site for perm anent care and hazardous w aste disposal site for perm anent care and storage.

Section 5 Section 5 Con and Negus Ponds Con and Negus Ponds Section 5 Section 5 - Con and Negus Ponds Con and Negus Ponds

• The cleaned areas w ill be graded to direct surface runoff

g to the Middle Pud TCA

• Low perm eability engineered cover has been designed

for these tw o ponds w ith the objective of reducing for these tw o ponds w ith the objective of reducing infiltration to < 2 % .

• Cover w ill include a Geosynthetic Clay Liner ( low

y y ( perm eability liner) w hich has a ‘clay’ core. As such, it is expected to have a long life ( + 1 0 0 years) as com pared to synthetic liners ( plastic / HDPE) .

• The w ater quality of groundw ater dow n gradient of the

capped ponds w ill be assessed by m onitoring w ells.

Section 5 Con and Negus Ponds Section 5 - Con and Negus Ponds

• The GCL liner w ill be capped w ith a coarse gravel /

cobble m aterial that is both physically and chem ically cobble m aterial that is both physically and chem ically

• stable. As set out in Section 5 .3 .1 , the gravel w ill be

tested to confirm that the upper layer w ill have arsenic levels less than 3 4 0 m g/ kg of total arsenic.

• I f needed, a quarry w ould be developed north of the

w ater treatm ent plant to provide cover m aterial. The quarry w ould be closed in a m anner consistent w ith the Cl id li bli h d b C f i Closure guidelines established by I NAC for open pits or quarries ( end of Section 5 .3 .1 ) .

• A large boulder barrier w ill be constructed and
• A large boulder barrier w ill be constructed and

m aintained to prevent inadvertent access to these areas by m otorized vehicles.

Con P Con Pond

• nd

Con P Con Pond

• nd – July 2005

2005 July 2005 2005 Con P Con Pond

• nd

Con P Con Pond

• nd – July 2005

2005 July 2005 2005 Con P Con Pond in center of

• nd in center of photog

photograph ph Con P Con Pond in center of

• nd in center of photog

photograph ph

Con P Con Pond a

• nd at Closur

Closure in 2008 e in 2008 Con P Con Pond a

• nd at Closur

Closure in 2008 e in 2008 C P C P d ith k t l C P C P d ith k t l Con P Con Pond a

• nd at Closur

Closure in 2008 e in 2008 Con P Con Pond a

• nd at Closur

Closure in 2008 e in 2008 Con

• n P

Pon

• nd

d w ith ith ro rock k co cover at t closur

• sure

Con

• n P

Pon

• nd

d w ith ith ro rock k co cover at t closur

• sure

Ne Negus P gus Pond

• nd

Ne Negus P gus Pond –

• nd –

– Jul uly 2005 y 2005 July 2005 2005

Ne Neg s P Pond a

• nd at Clos

Clos re in in 2008 2008 Ne Neg s P Pond a

• nd at Clos

Clos re in in 2008 2008 Ne Negus P s Pond a

• nd at Clos

Closure in in 2008 2008 Ne Negus P s Pond a

• nd at Clos

Closure in in 2008 2008 Ne Negus P gus Pond w ith r

• nd w ith rock co

cover Lar Large r ge rock Ne Negus P gus Pond w ith r

• nd w ith rock co

cover Lar Large r ge rock Ne Negus P gus Pond w ith r

• nd w ith rock co

cover. Lar Large r ge rock Ne Negus P gus Pond w ith r

• nd w ith rock co

cover. Lar Large r ge rock bar barrier not sho rier not show n f n for r clarity arity. bar barrier not sho rier not show n f n for r clarity arity.

Calcine Stor Calcine Storage Ar e Area ea Calcine Stor Calcine Storage Ar e Area ea – July 2005 2005 July 2005 2005

C l i ‘ l d ’ f C l i ‘ l d ’ f

Calcine Stor Calcine Storage Ar e Area ea Calcine Stor Calcine Storage Ar e Area ea July 2005 2005 July 2005 2005

Calcine storage area ‘cleaned out’ for w aste storage Calcine storage area ‘cleaned out’ for w aste storage

Hazar Hazardous W

• us Waste Stor

ste Storage Site e Site Hazar Hazardous W

• us Waste Stor

ste Storage Site – e Site – – S 2008 2008 S 2008 2008

R k h d i Mill R k h d i Mill

September eptember 2008 2008 September eptember 2008 2008

Rock cap on hazardous w aste storage site. Mill Rock cap on hazardous w aste storage site. Mill com plex is rem oved from area at bottom of photo. com plex is rem oved from area at bottom of photo.

Hazar Hazardous W

• us Waste

ste Hazar Hazardous W

• us Waste

ste Site Ca Site Cap Design p Design Site Ca Site Cap Design p Design Site Ca Site Cap Design p Design Site Ca Site Cap Design p Design Cover System for Hazardous W aste Disposal Cover System for Hazardous W aste Disposal Site and Hazardous W aste Sites Site and Hazardous W aste Sites

Section 6 Section 6 -

• Tailing Containm ent Areas ( TCA’s)

Tailing Containm ent Areas ( TCA’s) Historic and Recently Active Historic and Recently Active

• Historic – Negus, Neil Lake, Low er Pud Lake and

Crank Lake TCA’s w ill be drained, contoured and Crank Lake TCA s w ill be drained, contoured and revegetated. l i d d iddl d C ’

• Recently Active – Upper Pud and Middle Pud TCA’s

w ill be capped w ith a m inim um 5 0 to 6 0 cm layer

• f broken rock and then seeded and fertilized. Soil

w ill be im ported to create “islands” on the surface

• f the TCA to enhance the rate and success of

vegetation establishm ent on the rock. ege a

• es a

s e

• e
• c

Section 6 Section 6 -

• Tailing Containm ent Areas ( TCA’s)

Tailing Containm ent Areas ( TCA’s) Historic and Recently Active Historic and Recently Active

• A section has been added to the Closure Plan to detail

how vegetation success w ill be m easured and w hat how vegetation success w ill be m easured and w hat criteria w ill be used to determ ine w hen additional contingent m easures are needed.

• Section 6 .5 .1 . sets out a series of contingency plans that

describe additional m easures that w ill be taken by MCML if the vegetation cover is not successful w ithin 4 MCML if the vegetation cover is not successful w ithin 4 to 5 years.

Section 6 Section 6 Tailing Containm ent Areas ( TCA’s) Tailing Containm ent Areas ( TCA’s) Section 6 Section 6 - Tailing Containm ent Areas ( TCA’s) Tailing Containm ent Areas ( TCA’s) Historic and Recently Active Historic and Recently Active

• The details for the engineered cover to be placed on the Upper
• The details for the engineered cover to be placed on the Upper

and Middle Pud TCA have been included in Section 6 .5 .1 .

• The details outline the initial m odeling used to check the

design and present the m aterial specifications that w ill needed design and present the m aterial specifications that w ill needed to achieve the target infiltration ( < 7 % ) for the cover.

• A test pad w as developed in 2 0 0 5 and is being m onitored for

ph sical stabilit I t as seeded at that tim e and is being sed physical stability. I t w as seeded at that tim e and is being used to evaluate vegetation success on the rockfill. Further studies are planned in 2 0 0 7 to confirm the m odeling used in the design.

• W ith the exception of rock outcrops, the surface area w ill be
• vegetated. Fertilizer w ill be added and the area over-seeded

for the first several years to enhance success.

Neil Lak Neil Lake e Neil Lak Neil Lake e J l 2005 2005 J l 2005 2005 Neil Lak Neil Lake e Neil Lak Neil Lake e – July 2005 2005 July 2005 2005

Neil Lak Neil Lake e Neil Lak Neil Lake e – 2010 Pr 2010 Projection

• jection

2010 Pr 2010 Projection

• jection

N il L k d i 2 0 0 8 K L k i N il L k d i 2 0 0 8 K L k i

Neil Lak Neil Lake e Neil Lak Neil Lake e – 2010 Pr 2010 Projection

• jection

2010 Pr 2010 Projection

• jection

Neil Lake as revegetated in 2 0 0 8 , Kam Lake in Neil Lake as revegetated in 2 0 0 8 , Kam Lake in

• background. Note W ater Treatm ent Plant still in place.
• background. Note W ater Treatm ent Plant still in place.

Upper Pud Upper Pud Upper Pud Upper Pud - July 2005 2005 July 2005 2005 Upper Pud Upper Pud Upper Pud Upper Pud - July 2005 2005 July 2005 2005

Upper Pud Upper Pud Upper Pud Upper Pud - July 2010 Pr 2010 Projection

• jection

July 2010 Pr 2010 Projection

• jection

U P d d i h k d l U P d d i h k d l

Upper Pud Upper Pud Upper Pud Upper Pud July 2010 Pr 2010 Projection

• jection

July 2010 Pr 2010 Projection

• jection

Upper Pud, capped w ith w aste rock and gravel. Upper Pud, capped w ith w aste rock and gravel. Note vegetation starting to show . Note vegetation starting to show .

Upper Pud Upper Pud Upper Pud Upper Pud – 2015 Pr 2015 Projection

• jection

2015 Pr 2015 Projection

• jection

V i bli h d U P d TCA V i bli h d U P d TCA

Upper Pud Upper Pud Upper Pud Upper Pud – 2015 Pr 2015 Projection

• jection

2015 Pr 2015 Projection

• jection

Vegetation cover now established on Upper Pud TCA Vegetation cover now established on Upper Pud TCA

Co Cover T r Test P st Pad ad on

• n Upper Pud

Upper Pud Co Cover T r Test P st Pad ad on

• n Upper Pud

Upper Pud 2006 2006 2006 2006 June une 2006 2006 June une 2006 2006

Test P st Pad f ad for r Vegeta getation tion Test P st Pad f ad for r Vegeta getation tion C

• n Mine R
• n Mine Rock Cov
• ver
• n Mine R
• n Mine Rock Cov
• ver

Section 7 Section 7

Contam inated Soils:

f

• Minesite has been im pacted by 6 5 years of m ining
• Areas of im pact have been identified
• Site has been divided into 4 zones to facilitate closure

and reclam ation and reclam ation.

• The Zones are:
• Zone 1 - Blend Plant/ Negus Pond Con Pond
• Zone 1

Blend Plant/ Negus Pond, Con Pond, Hazardous W aste Disposal Site

• Zone 2 – Tailing Areas: Upper Pud, Middle Pud,

Low er Pud, Neil Lake, Negus Tailing, and Crank Lake

• Zone 3 – Main m ine lease w ith m ill area, Robertson

headfram e, and area around tailing areas to north, w est and south

• Zone 4 – Rat Lake, Tin Can Hill, Con Cam p and Dock,
• Zone 4

Rat Lake, Tin Can Hill, Con Cam p and Dock, and Mosher I sland.

Section 7 Section 7

Contam inated Soils:

• Closure plan for Zone 1 is discussed in Section 5 .

f

• Closure plan for Zone 2 is discussed in Section 6 .
• Closure plan for Zones 3 and 4 are discussed here.

Th l l f Z 3 i id d i 2 t

• The closure plan for Zone 3 is considered in 2 parts.
• Area 1 . Mill and headfram e buildings w ill be

rem oved. I m pacted soil w ill be placed in the hazardous w aste disposal site or the non-

• po
• hazardous w aste site as determ ined by testing.

Area w ill be reclaim ed to the NW T industrial use standard.

• Area 2 . Soil in the areas to the north, w est and

south of Zone 2 ( active tailing basins) w ill be

• tested. Site specific plans to close these areas w ill

b d l d b d th lt f t ti be developed based on the results of testing.

Section 7

Contam inated Soils:

• The closure plan for Zone 4 ( Rat Lake, Tin Can Hill and

Con Dock) started w ith testing of soil at 8 sites Con Dock) started w ith testing of soil at 8 sites identified as having arsenic contam inated soil. I n addition to arsenic, all m etals on the GNW T contam inated sites list w ere included in the testing program . program .

• I f any m etal on the list is exceeded and determ ined not

to be naturally occurring, then the sites w ill be evaluated to determ ine if clean up is necessary. Data to date suggests once the arsenic contam inated soils are date suggests, once the arsenic contam inated soils are rem oved or cleaned up, the other m etals of concern are rem oved.

• The test results indicated that arsenic at 5 of the sites is

ll i i li i l f naturally occurring m ineralization – not a result of m ining. The others sites w ill be further investigated.

• The rest of Zone 4 w as inspected and no other

contam inated sites w ere identified. I f additional sites contam inated sites w ere identified. I f additional sites are found in the next 4 years, a site specific closure plan w ill be developed for each area.

Section 7 Section 7

Contam inated Soils:

• I n 2 0 0 7 , sites aw ay from the m ain m ine area –

m ill and Robertson Headfram e - w ill be tested to confirm the extent and type of arsenic that m ay be present in the soil present in the soil.

• W ater that collects in the excavations at the m ill

w ill be directed to construction sum ps in the w ill be directed to construction sum ps in the excavation area. These sum ps w ill be pum ped and the w ater directed to the Middle Pud TCA.

• Section 7 .4 details the plan to clean up the m ill

site and clean the depressions in the rock surface

• nce the m ill is rem oved.

Section 8 Section 8

W ater Managem ent:

• Since the early 1 9 8 0 ’s surface w ater on site has been

collected and directed to the Middle Pud TCA and then to the W ater Treatm ent Plant.

• W ater treated at the plant, and at nine sam pling

stations around the site, has been m onitored under the W ater License since the early 1 9 8 0 ’s.

• Regulatory lim its for these contam inants are set out in

the W ater License and in federal MMER regulations. These w ill continue to be applied follow ing Closure These w ill continue to be applied follow ing Closure and w ill apply to m inew ater once it nears the surface. I f the lim its are exceeded, the m inew ater w ould be pum ped to the Middle Pud TCA for treatm ent.

Map of C rrent SNP Sites Map of C rrent SNP Sites Map of Current SNP Sites Map of Current SNP Sites

Section 8 Section 8

W ater Managem ent:

• Engineered structures control site surface
• drainage. The Closure Plan provides further

im provem ent to the system .

• Offsite flow s not directed to Middle Pud are

m inim al and have not been in contact w ith im pacted areas im pacted areas.

• These flow s are currently m onitored by the

Surveillance Netw ork Program ( SNP) under the Surveillance Netw ork Program ( SNP) under the NW T W ater License.

• Rat Lake clean up is com plete and a final report
• Rat Lake clean up is com plete and a final report

w ill be subm itted in March 2 0 0 7 . The report includes the results of the speciation tests.

Section 8 Section 8 W ater Managem ent:

• The Closure Plan creates additional surface w ater

m onitoring stations and w ill m onitor the quality of the m inew ater as it approaches the surface. pp

• Six groundw ater m onitoring w ells have been

installed and several m ore are included in the Closure Plan, including 2 deep w ells adjacent to m ine w orkings.

• Monitoring at these additional stations w ill

continue and be required under future W ater Licenses.

Section 8 Section 8 W ater Managem ent :

• Minew ater and m ine flooding
• Minew ater and m ine flooding.
• URS sam pled underground m inew ater in 2 0 0 4
• MCML sam pled underground m inew ater in 2 0 0 6 .

Mi fl d d t 4 7 0 0 L l f S t b 2 0 0 6

• Mine flooded to 4 7 0 0 Level as of Septem ber 2 0 0 6 .
• Minew ater is expected to reach surface in late 2 0 1 4 , thus Con Mine

w ill take ~ 1 1 years to flood.

• W ater quality testing indicates m inew ater is relatively clean – Zinc

is only param eter above W ater License lim it.

• Closure Plan calls for installation of access points in the concrete

caps at Robertson Shaft, C-1 Shaft, and 2 0 4 Q Stope to allow for installation of pum ps should it be necessary to pum p and treat the m inew ater w hen it reaches surface.

S ti 9 Section 9

Closure and Post-Closure Monitoring

• Monitoring of the site is detailed in Section 9 .1 and

includes geotechnical inspections of the tailing dam s, closed hazardous sites, and w ater m anagem ent f iliti Th t ti t ( S ti 1 0 ) ti i t

• facilities. The cost estim ate ( Section 1 0 ) anticipates

that environm ental m onitoring w ould continue for ~ 5 0 years, but the frequency of inspections w ould be reduced over tim e.

• Post-Closure m onitoring is anticipated to continue

unchanged for at least 2 5 years, or until w ater quality satisfies the W ater License discharge lim its and w ater satisfies the W ater License discharge lim its and w ater treatm ent can be discontinued. The MMER and EEM program s w ould also continue to apply during that period.

S ti 9 Section 9

Closure and Post-Closure Monitoring

• The annual geotechnical inspection of the

m inesite includes the chem ical and physical stability of the TCA’s plus all dam s dykes and stability of the TCA s, plus all dam s, dykes and drainage channels.

• The inspection w ill be expanded to include caps
• The inspection w ill be expanded to include caps
• n the openings to surface, and the results of

groundw ater m onitoring.

• A report of each inspection, and a plan outlining

any required action, w ould be sent to the MVLW B the I NAC I nspector and Environm ent MVLW B, the I NAC I nspector, and Environm ent Canada.

S i 9 Section 9

Closure and Post-Closure Monitoring

• Federal Environm ental Effects Monitoring ( EEM)

has been in effect since June 2 0 0 2 . as ee e ec s ce u e 0 0

• Num erous param eters, including 3 6 m etals,

are routinely m onitored. P t Cl it i i l d EEM d thi

• Post-Closure m onitoring includes EEM and this

w ill continue at least for the next 6 to 9 years.

• Other than arsenic, EEM has not detected any

, y

• ther m etals at levels of concern.
• I n addition to contam inants, EEM m onitors the

environm ental effects of treated effluent on the environm ental effects of treated effluent on the receiving w ater, including fish and other biota.

Section 1 0 : Cost Sum m ary & Schedule

• Subm itted to MVLW B in Decem ber 2 0 0 6
• Rem aining closure costs estim ated at

g ~ $ 1 2 .5 m illion

2 0 0 7 Pl d R l ti 2 0 0 7 Pl d R l ti 2 0 0 7 Planned Reclam ation 2 0 0 7 Planned Reclam ation

• Com plete treatm ent of all rem aining

arsenic sludges.

• Decom m ission and start to rem ove Blend
• Decom m ission and start to rem ove Blend

Plant structure.

• Begin dism antling and rem oval of

Begin dism antling and rem oval of rem aining surface structures, including m ill com plex and headfram es. P f l 3 f i li

• Perform cycle 3 of m inew ater sam pling
• I nstall rem aining groundw ater w ells.

2 0 0 8 Planned Reclam ation 2 0 0 8 Planned Reclam ation

• Com plete dem olition and rem oval of

rem aining surface structures.

• Begin reclam ation of Upper Pud TCA.
• Cap 2 0 4 Q stope opening.
• Cap Robertson / C-1 Shaft openings.
• Perform cycle 4 of m inew ater sam pling.

y p g

• Begin reclam ation of Middle Pud TCA.
• Continue closure m onitoring.

g

2 0 0 9 Planned Reclam ation 2 0 0 9 Planned Reclam ation

• Com plete reclam ation of Upper Pud TCA.
• Continue reclam ation of Middle Pud TCA.
• Perform cycle 5 of m inew ater sam pling.
• Com plete any rem aining tasks.
• Com m ence Post-Closure m onitoring.

2 0 1 0 Planned Reclam ation 2 0 1 0 Planned Reclam ation

• Com plete reclam ation of Middle Pud TCA.
• Over seed and fertilize revegetated areas.
• Perform cycle 6 of m inew ater sam pling.
• Com plete any rem aining tasks.
• Com plete any rem aining tasks.
• Continue Post-Closure m onitoring.

Status of Con Mine W ater License

• Current license expires on January 3 0 th 2 0 0 8
• Miram ar w ill ask that the W ater License be renew ed to

cover the period from January 2 0 0 8 thru Decem ber 2 0 1 4 – i e thru the 4 year physical reclam ation period and into the i.e. thru the 4 year physical reclam ation period and into the start of the post closure m onitoring period.

• The renew ed license w ill allow for reclam ation, ongoing

, g g w ater treatm ent and post closure m onitoring and m aintenance ( no further m ining or m illing) . This license period w ill allow the reclaim ed site conditions

• This license period w ill allow the reclaim ed site conditions

to becom e stable. Subsequent W ater Licenses w ill address the long term m onitoring and m aintenance requirem ents.

• Miram ar w ill subm it the application in 2 0 0 7 once the

Closure Plan has been approved.

Questions? Questions? Questions? Questions?

Registry

From: Angela Plautz [aplautz@mvlwb.com] Sent: Wednesday, February 14, 2007 9:29 AM To: 'Registry' Subject: FW: N1L2-0040: Presentation of Final C&R Plan

2/14/2007

Please put on registry – it does not have to go on the web.

• ----Original Message-----

From: Angela Plautz [mailto:aplautz@mvlwb.com] Sent: Tuesday, February 13, 2007 1:39 PM To: 'Sibbick, Steve'; 'Beverly Chamberlin'; 'Connell, Larry'; 'Dennis Kefalas'; 'Ernie Watson'; 'Fred Turner'; 'Helen Butler'; 'Jane

Howe'; 'Jason McNeill'; 'John Hull'; 'Kathleen Racher'; 'Ken Hall'; 'Lisa Lowman'; 'Louis Azzolini'; 'Magnus Bourque'; 'Mark Davy'; 'Monica Krieger'; 'Peter Lennie-Misgeld'; 'Rebecca Chouinard'; 'Tlicho Lands Department'; 'Angela Plautz'; 'Catherine Mallet'; 'Erika Nyyssonen'; 'Kevin O'Reilly'; 'North Slave Metis Alliance'; 'Ron Connell'; 'Scott Stewart'

Subject: N1L2-0040: Presentation of Final C&R Plan Good afternoon, On Thursday, February 22nd, Miramar is able to present the changes that were made to the Closure & Reclamation (C & R) Plan as a result of the MCARWG rounds of review and the conditions listed in the MVLWB Conditional Approval letters. I’ve booked the MVLWB boardroom for 1:30. The presentation will be about one hour long, with 1 ½ to 2 hours for questions. Please let me know your availability for this time or if you have any questions. Thank you, Angela Angela Plautz Regulatory Officer Mackenzie Valley Land and Water Board Phone: (867) 669-0506 Fax: (867) 873-6610

MVLWB Registry

From: Angela Plautz [aplautz@mvlwb.com] Sent: Friday, March 02, 2007 3:38 PM To: 'Sibbick, Steve'; 'Beverly Chamberlin'; 'Connell, Larry'; 'Dennis Kefalas'; 'Ernie Watson'; 'Fred Turner'; 'Helen Butler'; 'Jane Howe'; 'Jason McNeill'; 'John Hull'; 'Kathleen Racher'; 'Ken Hall'; 'Lisa Lowman'; 'Louis Azzolini'; 'Magnus Bourque'; 'Mark Davy'; 'Monica Krieger'; 'Peter Lennie-Misgeld'; 'Rebecca Chouinard'; 'Tlicho Lands Department'; 'Angela Plautz'; 'Catherine Mallet'; 'Erika Nyyssonen'; 'Kevin O'Reilly'; 'North Slave Metis Alliance'; 'Ron Connell'; 'Scott Stewart' Cc: 'Registry' Subject: N1L2-0040: Presentation and Supporting Documents for C&R Plan on MVLWB website

Page 1 of 1 3/5/2007

Good afternoon, For your information, the supporting documents for the MCML Closure & Reclamation Plan and the presentation are now on the MVLWB website. They are located at: http://www.mvlwb.com/pdf/pre2000water/N1L2- 0040/AR/final-Jan07/CD-SupportingDocs/ConCR-SupportingDocs.pdf and http://www.mvlwb.com/pdf/pre2000water/N1L2-0040/AR/final-Jan07/C_R_Overview-Presentation-Feb22-07.ppt. If you have any problems downloading the documents, please let me know. Angela Angela Plautz Regulatory Officer Mackenzie Valley Land and Water Board Phone: (867) 669-0506 Fax: (867) 873-6610