The world’s second-biggest miner by market value flagged around $300 million of gross costs from U.S. tariffs on its Canadian aluminum exports.

Rio Tinto named Simon Trott, who heads the company's most profitable iron ore unit, as its new chief executive on Tuesday, placing trust in the 20-year veteran to rein in operational costs and drive long term growth.

Rio Tinto on Tuesday named Simon Trott as its new chief executive officer. The appointment comes more than a month after CEO Jakob Stausholm announced his intent to step down after a 4-1/2 year tenure,