South32 has completed the acquisition of an additional stake in Mineracao Rio do Norte (MRN), a Brazilian company that operates the country’s largest bauxite mine. South32, which already owned 14.8% of MRN, purchased an additional 18.2% from Group Alcoa, increasing its total stake in the Brazilian firm to 33%. The acquisition is meant to “ensure greater access to bauxite for our integrated aluminum supply chain,” South32 said in a statement.

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