Aug 17 (Reuters) - Whitehaven Coal Ltd WHC.AX :
* Aims to limit cost increase in FY2018 to range of $1/t to $2/t compared to FY2017
* Aims to ensure Maules creek is operating at 10.5mtpa rom coal for FY2018
* Saleable coal production guidance for FY2018 is in the range of 22mt to 23mt, higher than fy2017
* ROM production from Narrabri in FY2018 is expected be higher than FY2017