The document discusses blast efficiency for a potash mining project in Thailand. It examines different mining methods including room and pillar mining with trial panels, wedge cuts, and slash rounds. Stoping methods are also discussed, including developing a boxcut, slot, and blasting benches in three stopes. Blast efficiencies, costs, and powder factors are provided for the various mining methods tested. The goal is to incorporate lessons learned through trial methods to continuously refine blast designs and patterns.

4. Halite Mining Layout Asean Potash Mining Project Pillar 1 Pillar 2 Pillar 3 Pillar 4

6. Pattern Incorporating Wedgecut Asean Potash Mining Project

7. Wedgecut (Plan View) Asean Potash Mining Project

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.

10. Halite Mining Layout Asean Potash Mining Project Pillar 1 Pillar 2 Pillar 3 Pillar 4

11. Pattern Without Cut Asean Potash Mining Project

13. Halite Mining Layout Asean Potash Mining Project

14. Halite Pilot Heading Asean Potash Mining Project

18. Stopes Layout Asean Potash Mining Project

19. Stope Boxcut and Slot Development Asean Potash Mining Project

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21. Asean Potash Mining Project

23. Stope Boxcut Asean Potash Mining Project

24. Asean Potash Mining Project View of bottom of boxcut after first overhand raise round fired and face barred down / marked ready for drilling.

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27. Stope Bench Blasts Asean Potash Mining Project

28. Asean Potash Mining Project Completed stope seen from final bench position.

29. Stope Bench Blasts (Trimex) Asean Potash Mining Project

30. Asean Potash Mining Project View from end of stope towards the completed bench, the top and bottom cuts;

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