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This document discusses techniques for controlling blasts near final walls, including trim blasting and presplitting. Trim blasting involves drilling holes parallel and close to the final wall with a maximum distance of 6 rows. Holes are spaced 4.2 meters apart. Presplitting involves drilling vertical holes along the crest with a spacing of 3 meters. Both techniques use short delays and instantaneous initiation to minimize damage to the final wall and promote wall stability. Diagrams show the drilling patte

Author

Kiswan

Language

EN