NORTH GOONYELLA VENTILATION SHAFT NO 2

PROJECT DESCRIPTION:

Due to our success in completing works at North Goonyella Ventilation Shaft No. 4, Abergeldie Mining (formally Ardent Underground) was engaged to bore and line the mine’s Ventilation Shaft No. 2. The scope of works included design and construction of an access road, construction of settling ponds required for the reverse circulation process, establishment of an on-site facility to pre-cast and cure composite steel and concrete shaft lining segments, manufacture and installation of a 5.2m diameter composite reinforced concrete and steel liner from surface to 272m depth; and construct of a concrete shaft collar and presinks.

Complex Challenges:

The Shaft was bored from surface to 84m depth at 6.8m diameter and steel lined through Tertiary strata. Then remainder of the shaft was completed at 6.15m diameter to coal seam level at 272m total depth. Abergeldie owns and operates three blind bore drilling rigs, the largest of which is capable of sinking shafts up to a diameter at least 50% larger than can any other blind boring rig in the world. No other rig in Australia would have been capable of blind boring a shaft of the diameter required for this project.

Business unit:

Mining

Client:

Peabody Coal

Current status:

Complete

Start date:

July 2004

Completion period:

August 2007

Contract type:

Lump sum

Value:

$15.4 million