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Ventilation Requirements for Uranium Mines Rabbit Lake Operation Presented by: Cristian Gherghel, P. Eng. Mine Engineer, Eagle Point Mine

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Outline Introduction Ventilation Design Factors Ventilation Planning at Rabbit Lake Operation The Rabbit Lake Ventilation System The Rabbit Lake Ventilation System Ventilation Management and Operating Practices Ventilation Management and Operating Practices Daily Operating Inspections Daily Operating Inspections Ventilation Surveys and Gas Monitoring Ventilation Surveys and Gas Monitoring Continuous Working Level Monitors Continuous Working Level Monitors Auxiliary ventilation Auxiliary ventilation Operating Practices for ore development and Production Operating Practices for ore development and Production

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Rabbit Lake Operation Rabbit Lake Rabbit Lake Operation Location Map

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Introduction - Mine Portal Reserves: 19.1 million lbs U 3 O 8 2006 Production: 5.1 million lbs

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Introduction - Eagle Point Mine GranitoidDome Mine Portal Main Decline MetaSediments 1000m E.A.R. E.A.R 03 Zone 040 Zone 163 ZONE 144 Zone 02 Next FW ZONE 02 Next ZONE

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Introduction Protecting Worker Exposure

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Introduction - Protecting Worker Exposure - Radiation Protection Dilute radon progeny to maximum exposure of 4 WLM Maintain radon progeny below 0.1 WL in working areas Reduce radon gas exposure limit new monitoring system Train underground personnel in the importance of proper ventilation Challenges for ventilation engineer:

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Introduction Ventilation planning Single pass ventilation Proper sequencing of the development and the stopes

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Ventilation Design Factors Diesel emission Flexibility Single pass ventilation Retreat mining method Fresh air mining workings in waste rock Sealing old working areas to minimize leakage Water grouting

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Ventilation Design Factors Flexibility to adapt to the mining conditions: O3 zone water inflow

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Ventilation Design Factors Dividing mining areas in ventilation blocks

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Eagle Point Mine Ventilation System

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Ventilation planning - Eagle Point U/G Mine

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15 to 30 m Remote Mucking CRF Ventilation Planning - Longhole Stoping

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Ventilation planning typical stope design

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Ventilation Planning - SBM drilling Ventilation Planning - SBM drilling

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Ventilation planning - Longhole Drilling workers on fresh air in the overcut drift

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Ventilation planning - modeling

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Ventilation Management Ventilation Management Procedure Ventilation surveys Vent Directives Auxiliary ventilation Sumps, Remucks and TTA Underduct flows Access in the levels from the main ramp Minimum flows required Main fans failure

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Vent surveys Weekly Volumetric Vent surveys Pressure surveys Gas monitoring: CO, CO2, NO2, 02

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Ventilation Management Radon progeny Radon gas Radiation Code of Practice

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Radon Progeny Working level ranges for alphanuclear prism lights. Prism Light Range Green 0.10 WL Green & Amber 0.11 to 0.25 WL Amber 0.25 to 0.50 WL Amber & Red 0.51 to 1.00 WL Red or Red with white strobe >1.0 WL

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Radon Gas Code of Practice for Radon Gas Prism Light Range Green 3,000 Bq/m^3 Green & Amber 3,000 to 15,000 Bq/m^3 Amber 15,000 to 50,000 Bq/m^3 (RWP and signs) Amber & Red 50,000 to 60,000 Bq/m^3 Red >60,000 Bq/m^3

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Monitoring: DDDDaily WL readings GGGGamma Surveys TTTTime cards TTTT.L.D. badges & DRDs PPPPersonal Dust Pumps PPPPADs (for underground) AAAAlpha Nuclear Monitors (cam) BBBBio-assay sampling

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Monitoring TLD and DRD T.L.D. Badges Thermo-luminescent Dosimeters Thermo-luminescent Dosimeters records actual exposure to Gamma records actual exposure to Gamma and Beta radiation and Beta radiation National Dose Registry National Dose Registry DRDs - Direct Reading Dosimeters - Shows gamma dose for period worn - Counts are recorded daily

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Monitoring - PAD PADs Personal Alpha Dosimeters Personal Alpha Dosimeters Worn by all underground personnel (daily) Worn by all underground personnel (daily) Measures Alpha exposure and LLRD for the month period Measures Alpha exposure and LLRD for the month period Loss or contamination requires immediate reporting Loss or contamination requires immediate reporting Must be recharged daily Must be recharged daily

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Monitoring - Prisms Alpha Nuclear Monitors Continuous air samplers Continuous air samplers Measures Alpha activity Measures Alpha activity Has a 10 minute cycle Has a 10 minute cycle Working levels are displayed as colored lights Working levels are displayed as colored lights Follows Code of Practice Levels Follows Code of Practice Levels Red leave area immediately Red leave area immediately

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Operating practices Single pass ventilation Shotcreting Gamma radiation below 10 microSV/h Shotcreting Applied remotely Stope mucking Remote control scooptram Sill covered with crushed rock min 30 cm Push auxiliary ventilation system Water grouting Sump, TTA and remucks under negative pressure Vent tubing minimum 30 m from the face

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Operating practices

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Conclusions Eagle Point Mine effective management program Key practices: proper monitoring of the ventilation system in all stages effective control of the radiation sources a proactive attitude

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Questions?