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REI Drilling, Inc. - Water Transfer Boreholes for Mining Applications
- 1. ADVANCED HORIZONTAL WATER DRAINAGE BOREHOLES FOR MINE REMEDIATION APPLICATIONS AND ACTIVE MINING OPERATIONS • Slide TextDIRECTIONAL SOLUTIONS Michael P. Bohan Licensed Professional Geologist / Technical Sales Manager
- 2. BACKGROUND • Slide TextDIRECTIONAL SOLUTIONS • 35 years as a service provider to the mining industry, developing directional drilling for projects including: degasification, exploration, dewatering, water transfer, abandoned mine verification, and shallow depleted oil development (oil mining). • 17 years providing dewatering / water transfer services to the mining industry, state / local government, & private entities. Approximately 30% of drilling revenues is derived from this category (dewatering / water transfer).
- 3. HORIZONTAL DEWATERING / WATER TRANSFER BOREHOLES • Slide TextDIRECTIONAL SOLUTIONS • PADEP – Kalp / Melcroft Acid mine drainage and mine pool control. • Rio Tinto – Bingham Canyon Stope dewatering / pore pressure reduction. • PacificCorp – Deer Creek Underground water transfer. • US EPA – Abandoned Argintine Mine Mine pool draw-down. • Iron Range Potential environmental & mining applications. IRON RANGE KELP / MELCROFT BINGHAM CANYON DEER CREEK ARGENTINE MINE Projects
- 4. HORIZONTAL DEWATERING / WATER TRANSFER BOREHOLES • Slide TextDIRECTIONAL SOLUTIONS Advantages over Conventional Vertical Well Installations: • Provide gravity drainage systems. • Eliminate pumping. • Zero power costs. • Minimal Maintenance.
- 5. KALP / MELCROFT ACID MINE DRAINAGE / MINE POOL CONTROL • Slide TextDIRECTIONAL SOLUTIONS PADEP - Somerset County, Pennsylvania Drill Station Mine Pool
- 6. KALP / MELCROFT ACID MINE DRAINAGE / MINE POOL CONTROL • Slide TextDIRECTIONAL SOLUTIONS PADEP - Somerset County, Pennsylvania • 2x 450ft x 12 inch diameter gravity fed drainage boreholes to control mine pool. • Elimination of weeping / seepage along outcrop. • Elimination of catastrophic failure (blowout potential).
- 7. KALP / MELCROFT ACID MINE DRAINAGE / MINE POOL CONTROL • Slide TextDIRECTIONAL SOLUTIONS PADEP - Somerset County, Pennsylvania • Very tight working confines. • All drilling effluent and cuttings had to be contained and disposed of. • Discharge water was recirculated back into the mine pool while drilling & reaming.
- 8. KALP / MELCROFT ACID MINE DRAINAGE / MINE POOL CONTROL • Slide TextDIRECTIONAL SOLUTIONS PADEP - Somerset County, Pennsylvania • Drill station developed from a sump. • 4 Inch pilot hole developed short of the break-out point. • Stage reamed up to 16 Inches.
- 9. KALP / MELCROFT ACID MINE DRAINAGE / MINE POOL CONTROL • Slide TextDIRECTIONAL SOLUTIONS PADEP - Somerset County, Pennsylvania • 12 Inch stainless steel casing and hardware installed due to low pH. • Wellhead & grout job engineered and pressure tested to 1.5x maximum head pressure. • Casing re-entered and break-out into inundated old workings.
- 10. DEER CREEK UNDERGROUND WATER TRANSFER BOREHOLE • Slide TextDIRECTIONAL SOLUTIONS PacificCorp - Huntington, Utah • 1x 10 Inch, HDPE lined water transfer borehole. • 4,860 ft length. • Connected two longwall coal mining districts. Drill Station
- 11. DEER CREEK MINE WATER TRANSFER • Slide TextDIRECTIONAL SOLUTIONS PacificCorp - Huntington, Utah • Provided drainage for treatment of mine discharge at one central location • Alternative would have been to pump perpetually from one of the sites.
- 12. KENNECOTT UTAH COPPER BINGHAM CANYON MINE STOPE DRAINAGE BOREHOLE • Slide TextDIRECTIONAL SOLUTIONS Rio Tinto – Salt Lake County, Utah Drill Station
- 13. KENNECOTT UTAH COPPER BINGHAM CANYON MINE STOPE DRAINAGE BOREHOLE • Slide TextDIRECTIONAL SOLUTIONS Rio Tinto – Salt Lake County, Utah Drill Station • Elimination of water behind pit walls • Allows for steepening the angle of pit wall / bench development for efficiencies / economics.
- 14. KENNECOTT UTAH COPPER BINGHAM CANYON MINE STOPE DRAINAGE BOREHOLE • Slide TextDIRECTIONAL SOLUTIONS Rio Tinto – Salt Lake County, Utah • 1x 6 Inch, stainless steel lined dewatering borehole. • 2,800 ft length.
- 15. ARGENTINE MINE POOL DRAW-DOWN • Slide TextDIRECTIONAL SOLUTIONS Drill Station US EPA – Rico, Colorado • Project parameters identical to Gold King. • Drawdown mine pool to reduce head pressure on mine seals.
- 16. ARGENTINE MINE POOL DRAW-DOWN • Slide TextDIRECTIONAL SOLUTIONS Gold King Mine Spill – Silverton, Colorado • 2015 • 3 million gallons of acid mine water. • TDS contained heavy metals. • Horizontal Drilling rather than excavation would likely have prevented the Gold King mine spill.
- 17. ARGENTINE MINE POOL DRAW-DOWN • Slide TextDIRECTIONAL SOLUTIONS US EPA – Rico, Colorado • 2x 8 inch horizontal acid mine water drainage wells. • Borehole No.1 - 220 ft length. • Borehole No.2 - 270 ft in length. Drill Station Drill Station
- 18. ARGENTINE MINE POOL DRAW-DOWN • Slide TextDIRECTIONAL SOLUTIONS US EPA – Rico, Colorado • Initial development of 100 ft through unconsolidated broken ground. • Utilized a casing advancer.
- 19. IRON RANGE MINES • Slide TextDIRECTIONAL SOLUTIONS Environmental Applications • Abandoned, inundated mines. Active Mining • Applications for Pit dewatering.
- 20. IRON RANGE MINES • Slide TextDIRECTIONAL SOLUTIONS Environmental Applications Abandoned Inundated Mines • Need enough outfall (elevation) to allow for draw-down. • Borehole diameter needs to be large enough to handle flow volumes.
- 21. IRON RANGE MINES • Slide TextDIRECTIONAL SOLUTIONS Active Mining • Mining may be below drainage, I.E. Gravity drainage may not be effective. • Vertical well intercept. Drill Station Vertical Well Intercept
- 22. IRON RANGE MINES • Slide TextDIRECTIONAL SOLUTIONS Active Mining • Mining may be below drainage (I.E. Gravity drainage may not be effective). • Vertical well intercept. Drill Station Vertical Well Intercept