Narrabri Coal: Drift & skyline conveyor system

Narrabri Coal: Drift & skyline conveyor system

Narrabri Coal: Drift & skyline conveyor system
Narrabri Coal: Drift & skyline conveyor system

Location: Narrabri, NSW, Australia
Client: Whitehaven Coal
Contract Value: AUD$ 15M
Completion: May 2008 – February 2010

A greenfield site, NEPEAN Conveyors assisted in preparing the tender specification and design elements for the conveyor system, and after a competitive tender process, NEPEAN were awarded the contract to supply the Drift conveyor system. A separate contract was then awarded to design and construct the Skyline Tripper Stockpile conveyor.

NEPEAN worked closely with the mine owner, who were still planning surface infrastructure and bulk earthworks in the portal entry areas, to ensure due consideration was given to the requirements of the drift conveyor installation.

The Drift conveyor was designed to be functional firstly as a drift development conveyor with a sacrificial belt and installation of 2 x 1000kW VVVF drives, and once tunnelling by the roadheader is completed to the coal seam, the conveyor shall be reconfigured for production by adding a third 1000kW drive, supplying a tail take-up system and pulling on the steel cord belt.

Stockpiling of ROM coal is via a travelling tripper mounted on elevated gantry structure with 30m spans, walkways fitted both sides. Stockpile height was limited by the mine development application and approval, and thus the client sought to maximise live stockpile area provided by the conveyor system. Rail clamps provide security against unwanted movement of the travelling tripper, which discharges either side of the gantry.

Consideration of dynamic loads during dozer operation on the stockpile was exhaustive, as was the deflection criteria applied to the gantry design.