ENVIRONMENT

Ejected ballast from borehole hits operators on legs

WHILE attempting to unblock a ballast borehole at a New South Wales underground coal mine, a surface drill-rig operator and his offsider were hit on the legs with ballast that ejected from the borehole.

 A build-up of air pressure caused the loose ballast to dislodge a protective collar.

A build-up of air pressure caused the loose ballast to dislodge a protective collar.

The preliminary investigation suggests the rig had drilled through ballast in the hole and partly into the blockage. A build-up of air pressure caused the loose ballast to dislodge a protective collar,...

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