Asean Presentation Final Reviewed

1,692 views

Published on

Blast designs for the trial mining stage of an undergound potash project in Thailand.

0 Comments
2 Likes
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total views
1,692
On SlideShare
0
From Embeds
0
Number of Embeds
4
Actions
Shares
0
Downloads
0
Comments
0
Likes
2
Embeds 0
No embeds

No notes for slide

Asean Presentation Final Reviewed

  1. 1. Asean Potash Mining Project As a contractor we are most interested in BLAST EFFICIENCY , this means:- Introduction <ul><li>less drilling </li></ul><ul><li>less explosive </li></ul><ul><li>less detonators </li></ul><ul><li>good fragmentation </li></ul><ul><li>safe blasting systems </li></ul><ul><li>reliability </li></ul>
  2. 2. Materials Available A limited range of explosive materials is manufactured and imported into Thailand:- ICI, now Orica, local manufacture by Chai International Asean Potash Mining Project <ul><li>Cartridge Emulsions (local) </li></ul><ul><li>Millisecond and Halfsecond delay electric dets (local) </li></ul><ul><li>Ammonium Nitrate (imported) </li></ul><ul><li>Igniter Cord (local) </li></ul><ul><li>Non-electric Millisecond dets (imported) </li></ul><ul><li>Trimex (new local manufacture) trimming cartridges </li></ul>
  3. 3. Halite Mining <ul><li>trial halite extraction panels; room and pillar </li></ul><ul><li>panel dimensions 12m x 4m, pillar dimensions 12m x 4m x 16m </li></ul>Asean Potash Mining Project
  4. 4. Halite Mining Layout Asean Potash Mining Project Pillar 1 Pillar 2 Pillar 3 Pillar 4
  5. 5. Halite Mining <ul><li>panel dimensions 12m x 4m, pillar dimensions 12m x 16m </li></ul><ul><li>trial halite extraction panels; room and pillar </li></ul><ul><li>drilled by hand with jacklegs, 45mm diameter holes </li></ul><ul><li>parallel and wedge cuts </li></ul><ul><li>2.4 metre and 3.0 metre round lengths tested </li></ul>Asean Potash Mining Project
  6. 6. Pattern Incorporating Wedgecut Asean Potash Mining Project
  7. 7. Wedgecut (Plan View) Asean Potash Mining Project
  8. 8. Asean Potash Mining Project Salt Workshop, top three rows of face marked ready for drilling. Once drilled, the muckpile is cleared allowing the bottom rows and wedge to be drilled.
  9. 9. Halite Mining Efficiencies (Wedgecut) <ul><li>12m x 4m Salt Heading Fired with Wedgecut </li></ul><ul><li>2.4m round length drilled </li></ul><ul><li>30No. holes in wedgecut </li></ul><ul><li>70No. holes as easers / lifters </li></ul>Asean Potash Mining Project Cost per Blast (explosives) => £ 121.56 Average Pull 87.5% Efficient; I.e. 2.4m round pulling to 2.1m Implies; £ 1.20 / Bulk m3 1 : 2.49 Bulk Powder Factor
  10. 10. Halite Mining Layout Asean Potash Mining Project Pillar 1 Pillar 2 Pillar 3 Pillar 4
  11. 11. Pattern Without Cut Asean Potash Mining Project
  12. 12. Halite Mining Efficiencies (slash rounds) <ul><li>12m x 4m Salt Heading Fired As Slash Without A Cut </li></ul><ul><li>2.4m round length drilled </li></ul><ul><li>72 No. slash holes </li></ul>Asean Potash Mining Project Cost per Blast (explosives) => £ 88.76 Average Pull 95.8% Efficient; I.e. 2.4m round pulling to 2.3m Implies; £ 0.80 / Bulk m3 1 : 1.65 Bulk Powder Factor
  13. 13. Halite Mining Layout Asean Potash Mining Project
  14. 14. Halite Pilot Heading Asean Potash Mining Project
  15. 15. Halite Mining Efficiencies (salt pilot) <ul><li>7m x 2.55m Salt Pilot Heading </li></ul><ul><li>2.4m round length drilled </li></ul><ul><li>30 No. wedgeholes </li></ul><ul><li>20 No. easer / stope holes; later increased to 28 No. </li></ul>Asean Potash Mining Project Cost per Blast (explosives) => £ 58 Average Pull 92% Efficient; I.e. 2.4m round pulling to 2.2m Implies; £ 0.60 / Bulk m3 1 : 3.2 Bulk Powder Factor
  16. 16. Halite Mining Efficiencies (salt pilot) <ul><li>7m x 2.55m Salt Pilot Heading (slash widening) </li></ul><ul><li>option for 2.4m, 3.0m or 5m round lengths; efficiency assumed 95% </li></ul>Asean Potash Mining Project 2.4m round £ 0.89 / Bulk m3 1 : 1.83 Bulk Powder Factor 3.0m round £ 0.76 / Bulk m3 1 : 1.70 Bulk Powder Factor 5.0m round £ 0.66 / Bulk m3 1 : 1.85 Bulk Powder Factor
  17. 17. Stopes <ul><li>3 no. stopes </li></ul><ul><li>stoping dimensions; 15m x 10m x 20m </li></ul><ul><li>bench blasting using drill jumbo to top drill holes 51mm diameter </li></ul><ul><li>create raise, form slot, blast bench </li></ul>Asean Potash Mining Project
  18. 18. Stopes Layout Asean Potash Mining Project
  19. 19. Stope Boxcut and Slot Development Asean Potash Mining Project
  20. 20. Asean Potash Mining Project
  21. 21. Asean Potash Mining Project
  22. 22. Stopes Boxcut <ul><li>holes drilled from top to level below </li></ul><ul><li>charge lower portion as conventional overhand raise </li></ul><ul><li>top 13 metre portion charged from top </li></ul><ul><li>fired in 2-2.5 metre slices </li></ul>Asean Potash Mining Project
  23. 23. Stope Boxcut Asean Potash Mining Project
  24. 24. Asean Potash Mining Project View of bottom of boxcut after first overhand raise round fired and face barred down / marked ready for drilling.
  25. 25. Stope Boxcut Efficiencies <ul><li>16.5 metre boxcut / dropraise </li></ul><ul><li>fired in 7 no. rounds of approx. 2.3 metres </li></ul><ul><li>3 no. rounds fired as overhand raising from below </li></ul><ul><li>4 no. rounds fired as dropraise from above </li></ul>Asean Potash Mining Project Implies; £ 12.07 / Bulk m3 1 : 13.96 Bulk Powder Factor
  26. 26. Asean Potash Mining Project
  27. 27. Stope Bench Blasts Asean Potash Mining Project
  28. 28. Asean Potash Mining Project Completed stope seen from final bench position.
  29. 29. Stope Bench Blasts (Trimex) Asean Potash Mining Project
  30. 30. Asean Potash Mining Project View from end of stope towards the completed bench, the top and bottom cuts;
  31. 31. Stope Efficiencies Asean Potash Mining Project Implies; £ 0.30 / Bulk m3 1 : 0.83 Bulk Powder Factor For the work involved in an entire stope from boxcut to completed production, the explosives efficiencies can be calculated. If the efficiencies of the boxcut are disregarded; £ 0.23 / Bulk m3
  32. 32. Summation Asean Potash Mining Project It can be surprising to consider how many variations on a technique of blasting or mining method may be found on just a single contract. <ul><li>every change has the potential to make a significant impact </li></ul><ul><li>the most often used approach is to roughly calculate a design and then refine it by observation </li></ul><ul><li>the progress should never stop, patterns “evolve” </li></ul>

×