Hancock acquired a 51% interest in the Mt Bevan project from Legacy Iron Ore Ltd. and Hawthorn Resources.
Tres Amigos mine, a part of the Caballo Blanco Group of mines, has resumed operations after it was shut down following the incident.
The world's largest listed miner said iron ore output from Western Australia on a 100% basis was 76.8 million tonnes in the three months to June 30.
The company reported output of 80.6 million metric tons for the steel-making ingredient in the three-month period ended in June.