RIO DE JANEIRO, Oct 18 (Reuters) - An agreement

establishing the total amount miners Vale, BHP

and their joint venture Samarco must pay to compensate

damages associated with the collapse of the Mariana dam is

expected to be signed on Oct. 25, sources told Reuters on

Friday.

Vale had already said a deal was expected to be reached in

October, but no specific date had been set.

Local newspaper O Globo reported the date earlier on Friday.

The collapse of the dam at a Samarco iron ore mine near the

city of Mariana nine years ago unleashed a wave of toxic

tailings that killed 19 people, left hundreds homeless, flooded

forests and polluted the length of the Doce River.

($1 = 5.6877 reais)