A Large Pillar Blast at the Sullivan Mine
PILLAR extraction at the Sullivan Mine bas been in progress for over twenty-five years and bas .involved progressively larger pillars. The largest pillar blasted to date exceeds one million tons and is described in this paper. This blast is believed to be one of the largest to take place entirely underground.
Blast, CORE, Development, Developments, Drilling, feet, Pillar Blast, pyrrhotite, Ralf-Million-Ton Pillar, Sullivan Mine, Ore, Ores, pillar, Pillars, Shell