![Page 1: Giant Mine Remediation Project - CLU-IN Yellowknife Gold Mine produced ... C-SHAFT Frozen Block Conceptual Design CHANNELIZE ... Giant Mine Remediation Project](https://reader030.vdocuments.net/reader030/viewer/2022020315/5ae3c6477f8b9a595d8ee051/html5/thumbnails/1.jpg)
Giant Mine Remediation Project
NATO/CCMS Pilot Study MeetingOttawa June 2005
![Page 2: Giant Mine Remediation Project - CLU-IN Yellowknife Gold Mine produced ... C-SHAFT Frozen Block Conceptual Design CHANNELIZE ... Giant Mine Remediation Project](https://reader030.vdocuments.net/reader030/viewer/2022020315/5ae3c6477f8b9a595d8ee051/html5/thumbnails/2.jpg)
Giant Mine Location
CON MINE
Original Giant Mine “A” Shaft (1945)
![Page 3: Giant Mine Remediation Project - CLU-IN Yellowknife Gold Mine produced ... C-SHAFT Frozen Block Conceptual Design CHANNELIZE ... Giant Mine Remediation Project](https://reader030.vdocuments.net/reader030/viewer/2022020315/5ae3c6477f8b9a595d8ee051/html5/thumbnails/3.jpg)
1935 – gold discovery! - 21 original claims staked by Burwash Yellowknife
Mines Ltd.
From first production in 1948 until 2004 Giant Yellowknife Gold Mine produced
over 7 million ounces of gold.
![Page 4: Giant Mine Remediation Project - CLU-IN Yellowknife Gold Mine produced ... C-SHAFT Frozen Block Conceptual Design CHANNELIZE ... Giant Mine Remediation Project](https://reader030.vdocuments.net/reader030/viewer/2022020315/5ae3c6477f8b9a595d8ee051/html5/thumbnails/4.jpg)
BackgroundSeveral companies owned and operated Giant Mine for 55 years Legacy of mining activity• Toxic arsenic trioxide dust in underground storage (237,000 tonnes)• Buildings with severe arsenic contamination, asbestos insulation• Decaying mine infrastructure• Tailings impoundments, sludge settling and polishing ponds• Contaminated surficial materials (arsenic and hydrocarbon)• Inadequate Abandonment and Restoration Plan• Negligible financial security in place for remediation
1999 - Royal Oak Mines forced into receivership
![Page 5: Giant Mine Remediation Project - CLU-IN Yellowknife Gold Mine produced ... C-SHAFT Frozen Block Conceptual Design CHANNELIZE ... Giant Mine Remediation Project](https://reader030.vdocuments.net/reader030/viewer/2022020315/5ae3c6477f8b9a595d8ee051/html5/thumbnails/5.jpg)
Background1999: Indian and Northern Affairs Canada (INAC) entered into an agreement with Miramar to provide ongoing care and maintenance of Giant Mine – agreement also allowed Miramar to operate mine on reduced scaleMiramar indemnified for existing condition of mineAgreement allowed INAC to:
Develop options with Technical Advisor for the management of the underground arsenic trioxide Work with community to reach a preferred option Secure funding - Federal Contaminated Sites Accelerated Action PlanNegotiate cooperation agreement between Canada and Government of the NWT
![Page 6: Giant Mine Remediation Project - CLU-IN Yellowknife Gold Mine produced ... C-SHAFT Frozen Block Conceptual Design CHANNELIZE ... Giant Mine Remediation Project](https://reader030.vdocuments.net/reader030/viewer/2022020315/5ae3c6477f8b9a595d8ee051/html5/thumbnails/6.jpg)
Ore ProcessingRefractory ore
Arsenopyrite concentrate was roasted at high temperature (~500oC) to break down the mineral structure and liberate gold
![Page 7: Giant Mine Remediation Project - CLU-IN Yellowknife Gold Mine produced ... C-SHAFT Frozen Block Conceptual Design CHANNELIZE ... Giant Mine Remediation Project](https://reader030.vdocuments.net/reader030/viewer/2022020315/5ae3c6477f8b9a595d8ee051/html5/thumbnails/7.jpg)
Roasting process to extract gold produced 237,000 tonnes of arsenic dust as byproduct – now in underground storage
![Page 8: Giant Mine Remediation Project - CLU-IN Yellowknife Gold Mine produced ... C-SHAFT Frozen Block Conceptual Design CHANNELIZE ... Giant Mine Remediation Project](https://reader030.vdocuments.net/reader030/viewer/2022020315/5ae3c6477f8b9a595d8ee051/html5/thumbnails/8.jpg)
Gold Extraction by Roasting
S 19.96%
As2O3
Common Impurities Au, Ag, Co, Sn, Ni, Sb, B, Cu, Pb
Fe 34.3%
As 46.01%
Arsenopyrite Fe3+ As S
![Page 9: Giant Mine Remediation Project - CLU-IN Yellowknife Gold Mine produced ... C-SHAFT Frozen Block Conceptual Design CHANNELIZE ... Giant Mine Remediation Project](https://reader030.vdocuments.net/reader030/viewer/2022020315/5ae3c6477f8b9a595d8ee051/html5/thumbnails/9.jpg)
Arsenic trioxide dust in storage underground is enclosed completely in rock – all access drifts sealed by thick cement bulkheads
“ C” Headframe
2000
S
1000
S
0 N
1000
N
“ B” ShaftVentilation Intake
UBCPortal
5000
6000
250 LEVEL
425 LEVEL
100 LEVEL
5500575 LEVEL
C212
C10
C9 #15
#14
#12
#11
B230
B234
B208
B233
B235
B236
B214
B213
B212
Arsenic Chambers Long Section: 10 chambers & 5 stopes
![Page 10: Giant Mine Remediation Project - CLU-IN Yellowknife Gold Mine produced ... C-SHAFT Frozen Block Conceptual Design CHANNELIZE ... Giant Mine Remediation Project](https://reader030.vdocuments.net/reader030/viewer/2022020315/5ae3c6477f8b9a595d8ee051/html5/thumbnails/10.jpg)
![Page 11: Giant Mine Remediation Project - CLU-IN Yellowknife Gold Mine produced ... C-SHAFT Frozen Block Conceptual Design CHANNELIZE ... Giant Mine Remediation Project](https://reader030.vdocuments.net/reader030/viewer/2022020315/5ae3c6477f8b9a595d8ee051/html5/thumbnails/11.jpg)
Interior of empty storage chamber
![Page 12: Giant Mine Remediation Project - CLU-IN Yellowknife Gold Mine produced ... C-SHAFT Frozen Block Conceptual Design CHANNELIZE ... Giant Mine Remediation Project](https://reader030.vdocuments.net/reader030/viewer/2022020315/5ae3c6477f8b9a595d8ee051/html5/thumbnails/12.jpg)
11 story office tower in Yellowknife
![Page 13: Giant Mine Remediation Project - CLU-IN Yellowknife Gold Mine produced ... C-SHAFT Frozen Block Conceptual Design CHANNELIZE ... Giant Mine Remediation Project](https://reader030.vdocuments.net/reader030/viewer/2022020315/5ae3c6477f8b9a595d8ee051/html5/thumbnails/13.jpg)
• Surface– Buildings and other infrastructure
• Hazardous waste removal and demolition of contaminated structures
– Contaminated soils (arsenic and hydrocarbon)– Pits and mine openings– 4 tailings impoundments– Effluent treatment, settling and polishing ponds– Baker Creek– Junk equipment/scrap lay down areas
• Underground– Arsenic trioxide dust storage chambers
• Requirement for indefinite period of effluent treatment
Giant Mine Remediation
![Page 14: Giant Mine Remediation Project - CLU-IN Yellowknife Gold Mine produced ... C-SHAFT Frozen Block Conceptual Design CHANNELIZE ... Giant Mine Remediation Project](https://reader030.vdocuments.net/reader030/viewer/2022020315/5ae3c6477f8b9a595d8ee051/html5/thumbnails/14.jpg)
Baker Creek NORTHWEST TAILINGS POND
TREATMENT PLANTBack Bay
C-SHAFT
Frozen Block Conceptual Design
CHANNELIZE BAKER CREEK
BACKFILL BACKFILL
B1 Pit
C1 Pit
![Page 15: Giant Mine Remediation Project - CLU-IN Yellowknife Gold Mine produced ... C-SHAFT Frozen Block Conceptual Design CHANNELIZE ... Giant Mine Remediation Project](https://reader030.vdocuments.net/reader030/viewer/2022020315/5ae3c6477f8b9a595d8ee051/html5/thumbnails/15.jpg)
Water
Freezing and Water Management Sequence
![Page 16: Giant Mine Remediation Project - CLU-IN Yellowknife Gold Mine produced ... C-SHAFT Frozen Block Conceptual Design CHANNELIZE ... Giant Mine Remediation Project](https://reader030.vdocuments.net/reader030/viewer/2022020315/5ae3c6477f8b9a595d8ee051/html5/thumbnails/16.jpg)
Four separate areas of freezing
![Page 17: Giant Mine Remediation Project - CLU-IN Yellowknife Gold Mine produced ... C-SHAFT Frozen Block Conceptual Design CHANNELIZE ... Giant Mine Remediation Project](https://reader030.vdocuments.net/reader030/viewer/2022020315/5ae3c6477f8b9a595d8ee051/html5/thumbnails/17.jpg)
![Page 18: Giant Mine Remediation Project - CLU-IN Yellowknife Gold Mine produced ... C-SHAFT Frozen Block Conceptual Design CHANNELIZE ... Giant Mine Remediation Project](https://reader030.vdocuments.net/reader030/viewer/2022020315/5ae3c6477f8b9a595d8ee051/html5/thumbnails/18.jpg)
Ambientcold air
Heat released
CO2
CondensationCold
Liquid
Heat absorbed(cooling)
Evaporation
LiquidCO2
Warm ground
Passive Freezing
![Page 19: Giant Mine Remediation Project - CLU-IN Yellowknife Gold Mine produced ... C-SHAFT Frozen Block Conceptual Design CHANNELIZE ... Giant Mine Remediation Project](https://reader030.vdocuments.net/reader030/viewer/2022020315/5ae3c6477f8b9a595d8ee051/html5/thumbnails/19.jpg)
Hybrid thermosyphon
conceptual design
![Page 20: Giant Mine Remediation Project - CLU-IN Yellowknife Gold Mine produced ... C-SHAFT Frozen Block Conceptual Design CHANNELIZE ... Giant Mine Remediation Project](https://reader030.vdocuments.net/reader030/viewer/2022020315/5ae3c6477f8b9a595d8ee051/html5/thumbnails/20.jpg)
Hybrid Thermosyphons
Diavik Diamond Mine
![Page 21: Giant Mine Remediation Project - CLU-IN Yellowknife Gold Mine produced ... C-SHAFT Frozen Block Conceptual Design CHANNELIZE ... Giant Mine Remediation Project](https://reader030.vdocuments.net/reader030/viewer/2022020315/5ae3c6477f8b9a595d8ee051/html5/thumbnails/21.jpg)
![Page 22: Giant Mine Remediation Project - CLU-IN Yellowknife Gold Mine produced ... C-SHAFT Frozen Block Conceptual Design CHANNELIZE ... Giant Mine Remediation Project](https://reader030.vdocuments.net/reader030/viewer/2022020315/5ae3c6477f8b9a595d8ee051/html5/thumbnails/22.jpg)
Giant Mine Site – Plan Map of Surface Features
![Page 23: Giant Mine Remediation Project - CLU-IN Yellowknife Gold Mine produced ... C-SHAFT Frozen Block Conceptual Design CHANNELIZE ... Giant Mine Remediation Project](https://reader030.vdocuments.net/reader030/viewer/2022020315/5ae3c6477f8b9a595d8ee051/html5/thumbnails/23.jpg)
Demolition of hazardous buildings prior to contaminated soils removal
![Page 24: Giant Mine Remediation Project - CLU-IN Yellowknife Gold Mine produced ... C-SHAFT Frozen Block Conceptual Design CHANNELIZE ... Giant Mine Remediation Project](https://reader030.vdocuments.net/reader030/viewer/2022020315/5ae3c6477f8b9a595d8ee051/html5/thumbnails/24.jpg)
Northwest Tailings Pond
Tailings graded, covered natural drainage established
![Page 25: Giant Mine Remediation Project - CLU-IN Yellowknife Gold Mine produced ... C-SHAFT Frozen Block Conceptual Design CHANNELIZE ... Giant Mine Remediation Project](https://reader030.vdocuments.net/reader030/viewer/2022020315/5ae3c6477f8b9a595d8ee051/html5/thumbnails/25.jpg)
![Page 26: Giant Mine Remediation Project - CLU-IN Yellowknife Gold Mine produced ... C-SHAFT Frozen Block Conceptual Design CHANNELIZE ... Giant Mine Remediation Project](https://reader030.vdocuments.net/reader030/viewer/2022020315/5ae3c6477f8b9a595d8ee051/html5/thumbnails/26.jpg)
Effluent Treatment Plant and Settling Pond will be covered using design similar to tailings cover
![Page 27: Giant Mine Remediation Project - CLU-IN Yellowknife Gold Mine produced ... C-SHAFT Frozen Block Conceptual Design CHANNELIZE ... Giant Mine Remediation Project](https://reader030.vdocuments.net/reader030/viewer/2022020315/5ae3c6477f8b9a595d8ee051/html5/thumbnails/27.jpg)
Baker Creek Rehabilitation
![Page 28: Giant Mine Remediation Project - CLU-IN Yellowknife Gold Mine produced ... C-SHAFT Frozen Block Conceptual Design CHANNELIZE ... Giant Mine Remediation Project](https://reader030.vdocuments.net/reader030/viewer/2022020315/5ae3c6477f8b9a595d8ee051/html5/thumbnails/28.jpg)
Remediation PlanReview by expert federal departments
• Environment Canada• Fisheries• Health Canada
Regulatory Board Review ( 2 years)• Additional public input• Possible Full Environmental Assessment
![Page 29: Giant Mine Remediation Project - CLU-IN Yellowknife Gold Mine produced ... C-SHAFT Frozen Block Conceptual Design CHANNELIZE ... Giant Mine Remediation Project](https://reader030.vdocuments.net/reader030/viewer/2022020315/5ae3c6477f8b9a595d8ee051/html5/thumbnails/29.jpg)
Giant Mine Remediation Project
Diane WalshAdministrativeCoordinator
Bill MitchellProject Manager
Mark LiskowichHead, Technical andEnvironmental Services
Manny LimProject Specialist
Alex GlowachProject Specialist
Mark CronkEngineer PWGSC
Rosanna MassimiEnvironmental Scientist
For more detailed information:http://giant.gc.ca
Ben NordahnMining Technical
Specialist