The lower guidance was due to a slower ramp-up and ongoing disruptions to shipments caused by weather and other disruptions, the miner said.
Most of Rio Tinto's iron ore output originates from the Pilbara region in Western Australia.
Western Australia was hit by tropical cyclone Veronica at the end of March
, causing operations to halt at several of the region's ports.
It was also reported earlier this year that a fire broke out...