PERTH – Billionaire Gina Rinehart’s iron-ore producer said its mine in Western Australia won’t reach full capacity this year following issues at its port and processing plant.

The target of 55-million metric tons a year is now expected to be reached early in 2017, instead of late this year, Roy Hill Holdings CEO Barry Fitzgerald told reporters Wednesday at the mine in the Pilbara region.

he producer experienced some faults with components at its port and is addressing some construction issues related to the processing plant, he said.

“We set an aggressive target to try and get there by this year. We have not made that,” Fitzgerald said. “We will go reasonably close to it.”

Roy Hill is raising output after it began shipments in December from Australia’s largest single iron-ore mine. The commodity has rallied in 2016, confounding a slew of predictions earlier in the year that lackluster demand in China and rising low-cost supply would combine to drag prices lower.

China’s government stimulus is helping to support steel demand, though is aimed more at “maintaining capacity, rather than increasing capacity,” Fitzgerald said. Almost 90% of output from Roy Hill is under long-term contract, including more than half earmarked for partners outside China, the producer said last year.

Futures on China’s Dalian Commodity Exchange rose to as high as 396 yuan ($59.36) a ton in trading Wednesday and were 0.1% lower at 393 yuan a ton at 4:15 p.m. in Sydney. Iron ore with 62% content delivered to Qingdao in China declined 2.9% Tuesday to $56.09 a dry ton, the lowest since July 22, according to Metal Bulletin.

The impact of new seaborne supply – including from Roy Hill – won’t have as much influence on prices as forecast, according to Cliffs Natural Resources, the biggest US producer. Iron-ore will probably be sustained between $50 and $60 a ton, CEO Lourenco Goncalves said in an interview this week.

BHP Billiton, the biggest mining company and No. 3 iron-ore shipper, sees prices as likely to retreat as new supply arrives into the export market from Brazil and Australia.