http://www.mmg.com/en/Our-Operations/Mining-operations/Century.as...

http://www.mmg.com/en/Our-Operations/Mining-operations/Century.aspx

"MMG continues to study the viability of possible growth options that could have the potential to utilise Century’s extensive infrastructure at Lawn Hill and Karumba. These studies include investigations into alternative feed sources for the Century processing plant and further near-mine exploration as well as the potential retreatment of material from the tailings dam.
Century’s infrastructure at Lawn Hill and Karumba, including the pipeline, will be maintained in a state of operational readiness to allow MMG to initiate these growth options should they become feasible."

Given base metal prices atm. Rock phosphate at about $160aud/tonne must be looking like a pretty strong consideration as Century evaluates the futures of it's infrastructure.