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Continued windblasts meant that the Conglomerate roof had to be drilled and hydraulicly fractured to assist it to fall.
Water was injected into a short section of borehole until the rock began to crack.
Once a fracture is initiated it was left to spread.
Drilling into the roof was not without its dangers.
Photo McDonell 2001
One miner, Anthony Carroll was killed and another pinned by a rock fall while drilling to create a roof support.
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