Rio Tinto South African Project in Limbo on Security Concerns Apr 08 2021, 3:27 AM April 07 2021, 5:00 PM April 08 2021, 3:27 AM (Bloomberg) -- Rio Tinto Groupâs new $463 million mining project in South Africa will remain on hold until the security problems that halted work two years ago are resolved. (Bloomberg) -- Rio Tinto Groupâs new $463 million mining project in South Africa will remain on hold until the security problems that halted work two years ago are resolved. Richards Bay Minerals, the South African unit of Rio Tinto, is in talks with the countryâs authorities to permanently address violent protests around its operations before resuming work on the Zulti South project, said Werner Duvenhage, RBMâs managing director.