Mannering is a small underground thermal coalmine located at Mannering Park in southern Lake Macquarie. Centennial acquired Mannering, which was on ‘care & maintenance’, when it purchased the NSW Government’s state-owned mines (Powercoal) in 2002. Mannering was reopened in 2004 to supply coal via a dedicated overland conveyor direct to Vales Point Power Station.
Centennial placed Mannering on ‘care & maintenance’ in January 2013. In October 2013, Centennial entered into a production sharing arrangement with LDO's Chain Valley Colliery. Accordingly, LDO has assumed responsibility for all site matters for the duration of the Mining Cooperation Deed.