UPDATE 1-Brazil sues BHP, Vale for $5 bln in damages for mine disaster
November 30, 2015 at 23:15 PM EST
BRASILIA, Nov 30 (Reuters) - Brazil filed a lawsuit on Monday against two of the world's largest mining companies for 20 billion Brazilian reais ($5.2 billion) to clean up what it says was its worst environmental disaster, caused by the collapse of a tailings dam.