SAO PAULO, Aug 1 (Reuters) - Brazilian mining company Vale SA VALE5.SA dismissed as speculative a news report saying it planned to buy a stake in Samarco Mineração SA SAMNE.UL from Australian partner BHP Biliton Ltd, according to a securities filing on Tuesday.
The news item referred to in the filing appeared on July 30 in a blog hosted by O Globo newspaper, Vale said. Samarco, responsible for Brazil's worst environmental disaster in history, is a 50-50 joint venture of Vale and BHP.