Rio Tinto Group is looking at new ways to develop the giant Simandou iron-ore deposit in Guinea that it almost sold last year, according to people familiar with the matter. Simandou is one of the world’s biggest untapped mineral deposits, but has a controversial past. For more than a decade, it has been the center of a bitter dispute that includes Vale and Israeli mining tycoon Beny Steinmetz. An agreement to sell the project collapsed last year, and Rio now appears increasingly committed to finding a way to build it.
