Analyzing ventilation Analyzing ventilation requirements and the requirements and the utilization efficiency of the utilization efficiency of the Kidd Creek mine ventilation Kidd Creek mine ventilation system system 12 12 th th North American/U.S. Mine Ventilation North American/U.S. Mine Ventilation Symposium Symposium Reno, Nevada, U.S.A., June 9-11, 2008 Reno, Nevada, U.S.A., June 9-11, 2008
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Analyzing ventilation requirements and the utilization efficiency of the Kidd Creek mine ventilation system 12 th North American/U.S. Mine Ventilation.
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Analyzing ventilation requirements and Analyzing ventilation requirements and the utilization efficiency of the Kidd the utilization efficiency of the Kidd Creek mine ventilation systemCreek mine ventilation system
1212thth North American/U.S. Mine Ventilation Symposium North American/U.S. Mine Ventilation SymposiumReno, Nevada, U.S.A., June 9-11, 2008Reno, Nevada, U.S.A., June 9-11, 2008
Analyzing ventilation Analyzing ventilation requirements and the requirements and the utilization efficiency of the utilization efficiency of the Kidd Creek mine ventilation Kidd Creek mine ventilation systemsystem
• Stephen Hardcastle, Charles Kocsis & Gary Li,Stephen Hardcastle, Charles Kocsis & Gary Li,CANMET – MMSL, Sudbury, CanadaCANMET – MMSL, Sudbury, Canada
• Kingsley HortinKingsley HortinHatch Associates, Sudbury, CanadaHatch Associates, Sudbury, Canada(Formerly with Xstrata Copper, Kidd Creek, Timmins,(Formerly with Xstrata Copper, Kidd Creek, Timmins,Canada)Canada)
Kidd Creek Mine
• Northern Ontario
• Started as Open Pit in 1966
• Mines #1, #2, #3 & now Mine D(Planned to Level 102 @ 3,110m)
• Developed to Level 91 (2,770m)
• >7,000 tpd copper sulphide from Mines #3 & D
• 200 diesel units (>38,000hp)50 Production units (>14,000hp)
Kidd VentilationSurface
New NVS Exhaust Fans2 x 2,600kW (3,500hp)
Open Pit(Cold Stope Intake)
7.5MWR
#1 Shaft(7.5MWR Bulk Air Cooler)
#2 Shaft
SVR Exhaust Fan1,300kW (1,750hp)
PortalRamp Access
• Total Installed Primary System FanMotor Power 13,600kW (18,300hp)
• Operational Capacity 1,220m3/s(2.6Mcfm)
• New Underground Booster Fans,2 x 3,000kW (4,000hp) at 60 Level1,800m below surface
Kidd VentilationUnderground/Combined
• Very Significant Operating Cost
• Exhaust Air Plug (@7m Ø) wouldwrap around the Earth 25x per year
X 25X 25
Ventilation ReviewsObjective - to reduce cost/improve efficiency
Initial brainstorming review:
• Need to address routing of air to avoidhigh resistance fan assisted routes
• SVR system redundant with respect toMines #3 & D
• More detailed review needed to assessefficiency and the need for increasedventilation management
• 1,500kW (2,000hp) Fan Power removedXX
Detailed ReviewsAvailable Data
• Long-term production plans such as- a month by month, 18-month schedule of activity- a year by year, 10+ year tonnage plan
• Historical data of daily equipment activity recordedby mines personnel
Design Criteria
• 0.06 m3/s per kW diesel engine power(100cfm/bhp)
Past RequirementsPivot Table daily based analysis of 36 Levels
• On average - each level active: 174 days/year &17.5 of 36 levels active/day
• Level airflow requirement now averages 11m3/s
Minimal Flow The Norm
Short DurationMaximum Flows
IncreasingInactivity
Past RequirementsPivot Table Analysis Differences/Caveats• Potential double accounting – same vehicle more
than one location – this can happen• Multiple vehicles, up to 5, generate high demands• Available data provides duration but no time-stamp • Consequently it was not possible to determine
whether the activity was concurrent or sequential• This backward analysis, based upon observed
discontinuous activity, highlights maximum demand• The previous forward analyses were based upon
idealized continuous averaged activity
Efficiency/RedundancySystem Efficiency ≠ Utilization Efficiency• An efficient “System” is one with minimal leakage
regardless of whether the air distribution is appropriate
• Utilization/redundancy is a function of whether the distribution meets/exceeds production demands
All a question of definition:• Today’s production air could be tomorrow's leakage• Production demand – is that by day, week or
month?
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Air
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Airflow RequirementsLower Mine – Mines #3 & D
Airflow requirement based upon monthly distribution with diesel based backfill
Mine Delivery Capacity 1,220m3/s
Monthly average with diesel backfill 1,261m3/s
Demand greater than available supply hence
perceived problems
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Air
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Capacity 1,220m3/s
Monthly average with diesel backfill 1,261m3/s
Airflow requirement based upon monthly distribution with pastefill
Monthly average with pastefill 983m3/s
Airflow RequirementsLower Mine – Mines #3 & D
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Date 2005-06
Air
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Monthly average with diesel backfill 1,261m3/s
Capacity 1,220m3/s
Monthly average with pastefill 983m3/s
Airflow requirement based upon weekly distribution with pastefill
Airflow RequirementsLower Mine – Mines #3 & D
Weekly average with pastefill 681m3/s
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Date 2005-06
Air
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Monthly average with diesel backfill 1,261m3/s
Monthly average with pastefill 983m3/s
Capacity 1,220m3/s
Weekly average with pastefill 681m3/s
Airflow requirement based upon daily distribution with pastefill
Daily average with pastefill 400m3/s
Airflow RequirementsLower Mine – Mines #3 & D
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Date 2005-06
Air
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Monthly average with diesel backfill 1,261m3/s
Monthly average with pastefill 983m3/s
Weekly average with pastefill 681m3/s
Capacity 1,220m3/s
Daily average with pastefill 400m3/s
Production plan based monthly requirement with diesel placed backfill, average 642 m3/s
Airflow RequirementsLower Mine – Mines #3 & D
Analysis Findings
• Historical analysis shows the dynamic nature of production in a base metal mine – constant change
• Hence perceived under performance/inadequacy• Future plan based requirements are optimistic• Airflow distribution need to be managed to limit
total volume of air supplied - significant benefits• More frequent redistribution lowers the redundancy
- the optimum would be daily• Redistribution frequency needs to be more often
than future planning period to operate within the design capacity
Ventilation Management• Primary system is automated• Secondary system control is being considered
Ventilation ManagementMine introduced more frequent redistribution of secondary airflow & adjustment of primary system1. Production Engineering schedule upcoming
activities automatically producing airflow demands Level Tag Board Calc. Volume Dev Rehab CB-Drill CB-Install Rse Bore Prod Drill Blast Muck Paste CWF Dia Drill Transfer
Realized BenefitsPower Savings from ….• Elimination of a surface fan (initial review)• Numerous auxiliary fans turned off on inactive levels• Reduced demand/lower operating point for the
2 x 3000kW boosters• On average the mine now operates on 930 m3/s
which is 23% less than delivered at the start of the review process
The number of ventilation related complaints has decreased
Conclusions• Base metal mining is never constant• Ventilation needs vary with changing activity • Overall demand depends on how often the ventilation
is adjusted• Significant differences between operational needs if
airflows are redistributed daily, weekly or monthly• Long range plans are idealized averages
- actual operation is different• Both Forward and Backward analyses have a place -
both can have limitations • Ventilation management can save power & money
- it can also be simple
Acknowledgements:Acknowledgements:Xstrata Copper – Kidd Creek MineXstrata Copper – Kidd Creek Mine