Barry Ndlovu Principal Engineer - Caving. Rio Tinto. Oct 2021 - Present2 months. Brisbane, Queensland, Australia. I lead a Copper Technical team of mining engineers doing the studies, mine design and scheduling updates of the next Super Cave - Oyu Tolgoi in Mongolia. As an expert PCBC user, I''m a Mineral Reserves custodian of an estimated +80 years LoM.