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.