Pilbara miner Atlas Iron says it remains on track to meet its full year production target of 5.5 million to 5.7 million tonnes.
Atlas Iron said that in the March 2012 quarter it had shipped 1.21mt, down 13 per cent on the December 2011 quarter.
Production had been affected by tropical cyclones Heidi and Lua and a breakdown of the Utah Point ship-loading facility in January, it said.
The average price per tonne for the three-month period was $US124 ($A120).
"Atlas remains on track to ship approximately 5.5Mt to 5.7mt for the 2012 financial year," Atlas said in its quarterly production report.
The iron ore miner said that despite lower shipped volumes in the March 2012 quarter, costs per tonne remained consistent with guidance for the 2012 financial year at $42 to $45.
"This has been a solid performance from Atlas in the face of some difficult conditions," Atlas managing director Ken Brinsden said in a statement.
"The team has done well to keep operating costs under control in the face of some very adverse weather in the quarter."
More to come