Oct 13 (Reuters) - South32 Ltd S32.AX
* Concluded its review into Illawarra metallurgical coal's operating systems and processes
* Completed remedial action required to safely and sustainably recommence production at Appin mine
* illawarra metallurgical coal produced 819KT of coal during Sept. 2017 quarter
* Unit operating costs and profitability will be significantly impacted by a lower rate of production in FY18
* Longwall 707 restarted production and co plans to operate a single longwall at Appin mine