Oct 5 (Reuters) - Bhp Billiton (LON:BLT) Ltd BHP.AX
* Says positive drilling results at Caicos exploration well in Gulf Of Mexico
* Bhp billiton is expecting unit operating costs to remain at approximately US$10 per boe over 2017 and 2018 financial years Source text for Eikon: ID:nASX66MV5D Further company coverage: BHP.AX