Magda Chambriard, director of the ANP oil agency, attends a news conference in Rio de Janeiro May 23, 2013. Brazil's Libra prospect in the subsalt area that will be auctioned in the second half of October has between 26 billion and 42 billion barrels of in-place oil, Chambriard said on Thursday. REUTERS/Ricardo Moraes (BRAZIL - Tags: BUSINESS COMMODITIES)