A shrinkage method combining with medium-length hole and shallow hole
Fan shaped medium length hole
Medium-length hole blasting
medium-length hole blasting parameter
Medium-length hole caving
medium-length hole minimg
medium-length hole ore blast
medium-length-hole blasting
open pit middl-length hole blasting
pre-cut top medium-length hole pillar method
ratio of nozzle hole length nozzle diameter
Segmentation medium-length hole
Upward medium-length hole
length-diameter ratio of hole