South32 Limited (ASX:S32) is considering bidding for the $1 billion niobium and phosphate business of Anglo American plc (LSE:AAL) in Brazil, according to three people familiar with the situation. South32 sent out requests to investment banks as it seeks to hire an adviser to assist in the bidding process, the people said, asking not to be identified because the information is confidential. Goldman Sachs Group and Morgan Stanley were managing the sale for Anglo, the people said.