By Rhiannon Hoyle 

SYDNEY-- Fortescue Metals Group Ltd. slashed shareholder payouts as its first-half profit sank by more than 80% thanks to the downturn in iron-ore prices.

The world's No. 4 exporter of iron ore has been cutting costs and project spending while trying to reduce its debt levels, after the steelmaking commodity's value more than halved since the start of last year.

Even so, Perth, Australia-based Fortescue's net profit dropped to US$331 million in the six months through December, down from US$1.72 billion in the same period a year earlier, the company said Tuesday. It cut its interim dividend to 3 Australian cents a share, down from 10 Australian cents a share a year ago.

Iron-ore prices have been hit by a glut in supply coming from companies like Fortescue and its larger peers Rio Tinto PLC and BHP Billiton PLC. That has coincided with moderating demand growth in China, the world's biggest consumer of the commodity.

Fortescue said it would target further production cost reductions, while keeping a lid on growth projects until there is an improvement in the market. Chief Executive Nev Power said paying down a multibillion-dollar debt pile used to fund past rapid expansion remained its top priority.

"We don't see spending capital as a smart thing to do at the moment," he said. "We will be in a position to grow as the market demand is there to do that."

Sharply higher output from its mines has helped cushion the impact of the fall in iron-ore prices, Fortescue said. It shipped 53% more iron ore from its operations in the remote Pilbara mining region of northwestern Australia than a year ago. Nonetheless, the company's margin on its earnings before interest, tax, depreciation and amortization narrowed nearly 30% in the last six months, down from 55% a year ago.

Analysts currently expect iron-ore prices to fall further this year as global supplies continue to rise, although the Australian dollar's recent weakness should provide some support to domestic mining companies' earnings.

"We are concerned that further weakness in iron ore will continue to compress Fortescue's margins over the next three-to-six months," said Christopher LaFemina, an analyst at investment bank Jefferies, who recommended investors cut their holdings in the company.

"The problem is that management cannot control the iron-ore price," he said.

Shares in the mining company dropped 4.9% on the Australian stock exchange versus a 0.2% rise in a broader materials index.

Other iron-ore producers are facing challenges, too. Mount Gibson Iron Ltd. said Tuesday it swung to a large first-half loss due to hefty write-downs following the price falls and the mothballing of its own Koolan Island iron-ore mine.

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

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