ArcelorMittal SA’s head of mergers and acquisitions, Ondra Otradovec, is holding talks in South Africa with the nation’s top development-finance institution and trade department about the sale of the steelmaker’s local unit, people familiar with the situation said. The executive’s presence in the country is a sign that the discussions between the Luxembourg-based steelmaker and the Industrial Development Corp. have accelerated, said the people, asking not to be identified because the talks are private. The ...