Oct 31 (Reuters) - BHP Billiton (LON:BLT) Ltd BHP.AX
* Entered into a preliminary agreement with federal prosecutors' office in Brazil in relation to Samarco dam failure
* Preliminary agreement suspends a BRL 1.2 billion injunction order under BRL 20 billion public civil claim
* 12th court approved extension of date for negotiation of settlement arrangements
* On 30 Oct court approved extension of date for negotiation of settlement arrangements and amendment to preliminary agreement
* Extension allows for continuation of interim security arrangements provided to court on 24 Jan 2017