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Rio Tinto ’ s mining efforts are focused on aluminium , copper , diamonds , gold , industrial minerals ( borates , titanium dioxide and salt ), iron ore , and uranium . The Anglo-Australian multinational employs 47,000 people in 35 countries across six continents , with strong representation in Australia and North America . Rio Tinto is committed to exploring the potential for new technologies and this year signed an agreement with Caterpillar , which will supply and support mining machines , automation and enterprise technology systems for the new Koodaideri iron ore mine in Western Australia . OCTOBER 2019