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Rio Tinto , as one of the largest metals and mining companies in the world , posted a market capitalisation of $ 73.79bn in 2017 . A multinational firm , Rio Tinto has its headquarters in Melbourne , Australia and London . Though it supports operations on six continents , the bulk of its activities are centred in Canada and Australia . Rio Tinto devotes the major portion of its operations in the extraction of minerals such as iron ore , uranium , copper , aluminium , diamonds and coal . The company also expends significant resources to refining iron ore and bauxite . www . riotinto . com

SEPTEMBER 2018