AUSTAR VENT SHAFT

PROJECT DESCRIPTION:

Blind boring of a 465 meter deep, vertical shaft for ventilation of and access to Austar’s Stage 3 underground workings at their Hunter Valley coal mine. With an on-site fabricated, composite steel and concrete hydrostatic liner, the shaft has a finished diameter of 4.5 meters.

Complex Challenges:

Construction required a high level of accuracy. The challenge was to maintain true verticality throughout the entire depth, to within 250mm of its centerline to eliminate complications when transporting workers and materials through the shaft. There was an allowable tolerance of 0.05 per cent for the entire shaft length. A directional pilot hole was drilled for the drill head to follow.

Business unit:

Mining

Client:

Austar Coal Mine Pty Ltd

Current status:

Complete

Start date:

October 2009

Completion period:

October 2012

Contract type:

Lump sum/Fixed

Value:

$19.2 million