By Rhiannon Hoyle 
 

SYDNEY--Rio Tinto PLC reported a fall in quarterly iron-ore shipments as it faced setbacks from bad weather and a train derailment at its operations in Western Australia.

The Anglo-Australian miner reported global iron-ore shipments of 72.5 million metric tons during the three months through March, down 12% on the quarter immediately prior. It said sales were hampered by disruptions from Tropical Cyclone Olwyn and the train derailment, which temporarily blocked a circuit at Dampier port.

Still, shipments were up 9% on year as the mining company--the world's second-largest exporter of the steelmaking commodity--expanded its operations in Australia's iron-rich Pilbara region.

It meanwhile reported a 12% on-quarter rise in mined copper output, to 144,100 tons, underpinned by sharply higher output at the Escondida mine in Chile.

Write to Rhiannon Hoyle at rhiannon.hoyle@wsj.com

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