St George Mining has engaged one of the world’s leading authorities in niobium ore processing, Ricardo Maximo Nardi, to its high-grade niobium-rare earths Araxá project in Brazil’s Minas Gerais region. Nardi comes to the project with more than 30 years of experience in processing high-purity niobium oxide and its typical by-products, including barite, magnetite, phosphate and rare earth elements.