SYDNEY--Leighton Holdings Ltd. (LEI.AU) said its fiscal first-half profit more than tripled as Australia's largest construction and mining-services contractor continued to rebuild its balance sheet.

Leighton has made improving margins a priority as it works to regain credibility with investors after several difficult years, marred by delays and cost overruns on major Australian infrastructure projects. It's also had to overcome a rift with majority shareholder Hochtief AG (HOT.XE), which led to the resignation of three directors in March.

The country's miners and contractors are moving to simplify their operations in the face of rising costs, weaker commodity prices and a historically strong Australian dollar. That's posing a challenge to companies like Leighton as a decadelong boom in resources investment comes to an end.

Sydney-based Leighton reported a net profit of 366.2 million Australian dollars (US$333.4 million) for the six months through June, up from A$114.6 million a year earlier. The result was boosted by A$115 million from the sale of a majority stake in some of the group's telecoms assets, the company said.

Leighton's earnings have been weighed in recent years by cost blowouts relating to an airport toll road project in Brisbane and a desalination plant in the state of Victoria. A downturn in the Middle East construction market in the aftermath of the global financial crisis also resulted in writedowns.

In a sign that Leighton thinks these problems are behind it, the company more than doubled its interim dividend to 45 cents a share.

The company said it had increased its underlying net profit margin in the first half to 2.2%, compared with 1.0% during the same period last year.

After a decade of exceptionally strong investment in Australia's mining sector, resources companies like Leighton have started to concentrate on more-profitable assets. "The group also focused on improving its tendering discipline and increasing its win rate to reduce tender costs," Leighton said in a regulatory filing.

Still, a push by Australia's mining companies for better returns has also presented challenges for Leighton. Miners have asked contractors to trim their prices following volatility in the iron-ore market and a sharp fall in coal prices to multiyear lows. Earlier this year, BHP Billiton Ltd.'s (BHP) metallurgical coal joint venture in eastern Australia prematurely axed a contract with Leighton, replacing it with a smaller private company to reduce its costs.

Leighton said tough macroeconomic conditions and volatile commodity prices had hurt its contract mining business, driving down its pipeline of work by 20%.

While resources spending remains at record levels in Australia, the government has warned investment is peaking and may face a sharp decline in the next five years. Overall, Leighton reported a A$40.13 billion pipeline of work, down from A$43.49 billion at the end of December.

The A$5.8 billion-valued company has also faced a turbulent year in the boardroom. In March, Leighton was rocked by the resignation of three board members, including its former chairman, exposing differences between the Australian construction company's top ranks and majority shareholder Hochtief AG (HOT.XE).

Hochtief has since increased its stake in Leighton to 55.0% from 53.5%, and indicated it wants to buy more shares in the Australian construction company.

"Hochtief's additional investment demonstrates its confidence in the group's business model, management and outlook for the business," Leighton said.

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

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