By Rhiannon Hoyle 
 

SYDNEY--Iron-ore shipments through Australia's Port Hedland, the world's largest iron-ore export hub, slumped last month as China's push for clearer skies during a global summit in Beijing curbed demand.

Steel mills and factories were temporarily closed for the high-profile Asia-Pacific Economic Cooperation forum in an effort to reduce air pollution as leaders from around the world visited Beijing. Analysts had forecast curbs on heavy polluters across provinces including Hebei and Shandong, both major steel-producing regions, would damp shipments to the world's No. 1 buyer in November at a time when rocketing supply and already subdued demand had knocked prices to their lowest level in more than five years.

According to the Pilbara Ports Authority, which controls the Port Hedland facilities, 34.4 million metric tons of the steelmaking ingredient was shipped from the port last month. That was an 8.1% decrease on the month earlier.

Shipments destined for China were down 8.5% on-month at 29.0 million tons, a seven-month low.

"The fall in iron-ore exports to China in November likely reflects weaker demand after steel mills in Hebei cut steel output for cleaner air ahead of the APEC conference," Commonwealth Bank of Australia analyst Vivek Dhar said.

Mining companies including BHP Billiton Ltd. (BHP.AU), Australia's No. 2 iron-ore miner, Fortescue Metals Group Ltd. (FMG.AU) and Atlas Iron Ltd. (AGO.AU) use Port Hedland. The port is located in Australia's remote northwest Pilbara region.

Iron-ore prices have plunged nearly 50% this year, to less than US$70 a ton, after a surge in supply from new and expanded mines in Australia. However, analysts say China's appetite for the raw material also appears to be waning as its property sector slows.

Demand is expected to stay weak as the Northern Hemisphere enters its winter months.

"Buying from mills will most likely remain subdued as the colder weather in the north stifles finished steel sales," said Kash Kamal, an analyst at London-based broker Sucden Financial.

Low iron-ore prices have forced many Australian producers to curb spending to ensure their operations remain profitable. On Friday, Fortescue said it would spend 50% less developing its mining operations this year than previously forecast, deferring projects and exploration while it rides out the price slump.

It is also putting pressure on Australia's economy, which relies on commodities exports for revenue and has yet to see a strong recovery in nonmining sectors.

Still, while iron-ore shipments through Port Hedland were down on-month, the number of cargoes leaving the port remained significantly higher on-year.

Iron-ore traffic through the hub has risen sharply in recent years as mining companies have raised output in Pilbara, with production now starting for operations planned when prices were booming. Exports in November were up 23% compared with year-earlier volumes, with shipments destined for China 30% higher.

The Australian government expects Australia's total iron-ore exports, which includes those from the Dampier and Cape Lambert ports used by Rio Tinto PLC (RIO.AU), to rise 22% in 2014 to 707 million tons.

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

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