The Brazilian environmental protection agency Ibama said on Wednesday it had rejected a request from state-run oil company Petrobras (PETR4.SA) to drill a well at the mouth of the Amazon river.
The much-awaited decision follows a technical recommendation by the agency's experts to reject the proposal.
Petrobras has for years been trying to open up a new exploration front on the coast of Amapa state in northern Brazil near Guyana, where Exxon Mobil (XOM.N) has made important discoveries.
Petrobras had several opportunities to solve controversial points of its project, but it was still presenting "worrying inconsistencies" for the operation in a new exploratory frontier of "high socio-environmental vulnerability," Ibama said in a statement.
Petrobras did not immediately respond to a request for comment.
