By Rhiannon Hoyle 

SYDNEY-- BHP Billiton Ltd. sought to satisfy yield-hungry investors with the promise of higher returns despite a drop in fiscal first-half profit, reinforcing a shift among the world's largest mining companies to give more cash back to investors, as a decadelong commodities boom fades.

BHP on Tuesday pledged to maintain or increase its dividend even after a proposed spinofflater this year in which the world's largest mining company by market value would hive off some unwanted assets into a separate company called South32, which analysts estimate would be valued at roughly $15 billion.

Like its peers in the mining sector, BHP has been shelving expansion projects and cutting capital spending, after a supply glut emerged in many commodities, including iron ore and oil, two significant contributors to the company's earnings. But despite a 47% fall in profit in the six months ended Dec. 31 to $4.27 billion, BHP still raised its interim dividend 5% to 62 cents a share.

"If our shareholders approve the demerger, we do not plan to rebase or lower this dividend, which implies, all other things being equal, a higher payout ratio," BHP Chief Executive Andrew Mackenzie said. "And that's before you consider that South32 will be set up to deliver additional cash returns through dividends to their shareholders, which, of course, is all our shareholders at the moment."

Cautious mining executives are now looking to woo fund managers with beefed-up payouts instead of promises of endless growth, after a string of multibillion-dollar write-downs caused by the slump in commodity prices.

Confidence in mining companies has also been shaken by signs of moderating resources demand growth from China.

Anglo-Australian mining company Rio Tinto recently said it would buy back $2 billion of its shares in 2015 and pushed up its annual dividend 12%, while hinting it could increase future returns.

Last August, Switzerland-based mining company and trader Glencore PLC announced a $1 billion buyback and raised its dividend 11%. "Growth for growth's sake isn't for us," said Glencore CEO Ivan Glasenberg, himself a major shareholder.

Some mining companies have raised eyebrows by clinging to dividends even as their financial results weaken sharply.

Anglo American PLC, the world's fifth-largest diversified mining company by market value, said this month that it would maintain its full-year dividend at 85 cents a share, despite recording a $2.51 billion annual loss because of multibillion-dollar write-downs against its operations.

For sure, mining companies are having to weigh calls from shareholders for higher cash returns against their desire to maintain a strong balance sheet. Mr. Mackenzie of BHP has made it clear he wants to keep what the company calls a "solid A" credit rating, and has said a share buyback isn't an immediate priority. The company plans to reduce its capital spending 17% to $12.6 billion in its fiscal year ending in June.

Still, Mr. Mackenzie said he is confident BHP can cut costs and bolster cash generation after the proposed spinoff. "I think we have pitched it correctly," he said of BHP's capital-management plans. Shares in the company, which is listed in the U.K. and Australia, closed up 2.9% in Sydney. The stock was up 6.2% in London late Tuesday.

Still, not all investors are enamored by the shift in strategy among the biggest mining companies. "They are basically feeding the market what it wants at the moment but, in my view, you are throwing away capital that could be used for future advancement," said Robert Hook, a Melbourne-based fund manager at SG Hiscock & Co. Mr. Hook sold his holdings in BHP last month.

Some investors say it is difficult to gauge exactly how BHP's capital-returns program will proceed until there is further clarity on the shape of the company after the assets separation. BHP is set to release more details about the spinoff next month.

The assets BHP plans to jettison were among its strongest performers in the first half. The company's aluminum, manganese and nickel division, which will form the core of the new South32, has been benefiting from higher prices and lower costs. The division more than doubled its earnings before interest, taxes, depreciation and amortization to $1.07 billion.

Separately on Tuesday, BHP's chief for oil and gas production said the U.S.'s role as a so-called swing oil producer for the world isn't likely to last long, with the country's petroleum growth peaking sometime in the next decade.

"U.S. liquid growth is relatively short-lived," said Tim Cutt, president of BHP's petroleum and potash division, in a meeting with reporters in London.

U.S. shale production has contributed to a world-wide collapse in oil prices, which have been cut in half since June. The U.S. is now viewed as a swing producer of oil, meaning the world's supplies go up and down--and potentially drive prices--with the country's output.

And BHP Billiton Chief Financial Officer Peter Beaven said the mining giant doesn't have plans to meaningfully expand iron-ore production, citing concerns about an oversupplied market. "It is something we are a little cautious on," Mr. Beaven said about iron ore in a meeting with reporters in London. "This market is struggling, let's face it."

While demand for the steelmaking ingredient has "been reasonable" in China, Mr. Beaven said "the bigger issue on iron ore is of course supply." Still, he said iron ore has been profitable for BHP in its fiscal first half. BHP says it spent $20.35 a ton to produce iron ore in the first half, while the average price it realized was $70 a ton. Still, that was down 38% for the period, and prices have fallen more since.

Michael Amon in London contributed to this article.

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

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