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Canadian Diamond Drilling Association Vancouver, BC May 29, 2008 Technically Demanding

Canadian Diamond Drilling Association Vancouver, BC May 29, 2008 Technically Demanding Cement Grout Applications Involving Diamond Core Drilling Peter White, P.Eng. Diamond Core Drilling for Grouting Projects: In The Hole. Diamond Core Drilling

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Canadian Diamond Drilling Association Vancouver, BC May 29, 2008 Technically Demanding

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  1. Canadian Diamond Drilling Association Vancouver, BC May 29, 2008 Technically Demanding Cement Grout Applications Involving Diamond Core Drilling Peter White, P.Eng

  2. Diamond Core Drilling • for Grouting Projects: • In The Hole

  3. Diamond Core Drilling • for Grouting Projects: • In The Hole • Around The Hole

  4. Diamond Core Drilling • for Grouting Projects: • In The Hole • Around The Hole • Beyond The Hole

  5. Diamond Core Drilling • for Grouting Projects: • In The Hole • Around The Hole • Beyond The Hole • Typically Bad Ground Conditions

  6. Recent Diamond Drilling Contractors • with Technical Grouting Projects: • Boart Longyear (FNX Podolsky) • Forage Orbit Garant (FNX Podolsky) • Major Drilling (Goldcorp & Diavik) • Progressive Drilling (PCS Picadilly) • Hy-Tech Drilling (McArthur River)

  7. Grouting Project Profiles • Agnico-Eagle, Finland • Goldcorp, Red Lake, Ont. • Hsuehshan Tunnel, Taiwan • Pan American Silver, Peru

  8. Agnico-Eagle, Finland Kittilä Mine Ventilation Raise Through Water-Bearing Formations

  9. Agnico-Eagle, Finland Problem: To Seal Water-Bearing Formations Prior to Vent Raise Excavation

  10. Agnico-Eagle, Finland • Solution: • Systematic Perimeter Drill Hole Pattern • Down Stage Cement Grouting • Grouting Strategy • Specified Grout Mixtures • Target Grouting Parameters

  11. Raise Bore Machine Tent Overburden 5 m Water-Filled 25 m 40 m Broken 40 m Fractured

  12. 4 m dia Raise Bore Reamer

  13. Typical Raise Bore Enclosure

  14. Drill Casings for Electrical Cables

  15. Drill Casings for Mine Backfill Pipes

  16. Diamec U6 Drill Rig

  17. Cemix 203 H Colloidal Mixer

  18. Cemag 403 H Agitator Tank

  19. Agnico-Eagle, Finland • Key Elements for Success: • Experienced Contractor • Appropriate Drilling and Grouting Equipment • Selection of Suitable Cements for Site Conditions • Appropriate Use of Grouting Additives • Consistent Range of Grout Formulations • Target Grout Volumes and Decision Criteria • Limited Duration Grouting Operations

  20. Goldcorp Red Lake Mine Ventilation Raise With Major Water-Bearing Fracture

  21. Goldcorp, Red Lake Ont. Problem: To Seal Water-Bearing Fault In Pilot Hole at 400 ft Depth And Reduce 20 GPM Water Inflow Before Reaming Raise to 18 ft Dia

  22. Goldcorp, Red Lake Ont. Solution: Plug Pilot Hole to Stop Water Inflow Systematic Perimeter Drill Hole Pattern Microfine Cement Grouting

  23. Overburden 15 inch dia Pilot Hole 400 ft Water-Bearing Fracture 20 GPM

  24. Diamond Drill Overburden 400 ft HQ Drill Rods + Safety Cable Water-Bearing Fracture Inflatable Packer + Internal Valve

  25. 40 ft 40 ft Water Circulation 400 ft Grout Hole Grout Hole 25 ft 25 ft

  26. 400 ft Grout Hole Grout Hole Drain Water Column

  27. 400 ft Grout Hole Grout Hole Remove Inflatable Packer 2 GPM

  28. Foot Clamp & Safety Cable Sheave Wheel

  29. Safety Cable Sheave Wheel HQ Drill Rods in 15 inch Hole

  30. 6240 6260 6180 6200 6220 6280 Hole # 4 400 #4 26 ft 380 #2 Hole # 1 16 ft #5 Hole # 5 33 ft 80 ft Circle 50 ft Circle Vent Raise at Surface 24 ft 360 Hole # 3 #1 Hole # 6 #6 33 ft 37 ft 340 26 ft #7 #3 Hole # 7 Hole # 2 320 Red solid lines indicate surveyed hole trajectory from surface to approximately 400 ft Tan Tag - Tight Hole - zero or low grout consumption Yellow Tag - grout consumption in between tan & green holes Green Tag - Open Hole - high grout consumption Blue Circle Numbers indicate grouting sequence Goldcorp Vent Raise Grouting 2005 Grout Hole Survey Results P White November 3, 2005

  31. #12 Hole # 12 6240 6260 6180 6200 6220 6280 Hole # 4 400 #4 26 ft 380 #2 Hole # 1 16 ft 20 ft #5 Hole # 5 #11 20 ft Hole # 8 Vent Raise at Surface 24 ft 80 ft Circle 360 Hole # 3 #1 16 ft 25 ft Hole # 6 #6 16 ft 340 #10 13 ft #8 13 ft Hole # 9 Hole # 11 16 ft #7 #3 Hole # 7 Hole # 2 320 Hole # 10 Red solid lines indicate surveyed hole trajectory from surface to approximately 400 ft Tan Tag - Tight Hole - zero or low grout consumption Yellow Tag - grout consumption in between tan & green holes Green Tag - Open Hole - high grout consumption Blue Circle Numbers indicate grouting sequence Goldcorp Vent Raise Grouting 2006 Drill Hole Locations P White April 11, 2006 #9

  32. Goldcorp, Red Lake Ont. • Key Elements for Success: • Innovative Approach to Eliminate Groundwater Movement • Appropriate Drilling and Grouting Equipment • Water Pressure Testing To Assess Site Conditions • Selection of Suitable Cements • Gyro-Survey to Plot Drill Hole Positions

  33. Hsuehshan Tunnel Taiwan Exploration Drillhole In Blocky Ground

  34. Hsuehshan Tunnel,Taiwan Problem: To Drill Long Exploration Holes In Advance of Tunnel Heading Previous Contractor Could Not Drill Beyond 100 m

  35. Hsuehshan Tunnel,Taiwan Solution: Controlled Drilling Fast-Setting, High-Strength Grout Downstage Grouting Methods Using Inflatable Packers

  36. Hsuehshan Tunnel Project Twin 11.72 m Dia Road Tunnels Wirth TBM 4.8 m Dia Pilot Tunnel Robbins TBM

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