BHP Billiton Ltd. (BHP) is moving to take control of its iron ore mining operations in Australia's Pilbara region, signing an agreement to buy for $735 million the mining equipment and staff from a contracting company whose operations account for almost 70% of BHP's mining of the steelmaking commodity.

"While this move to an owner-operator model will remove a layer of complexity and costs from our business, the real focus of this proposed transaction is the work force," said Ian Ashby, president of BHP's iron ore division.

Ashby said taking over the contractor's business is a lower-risk alternative than having to hire its own employees in Western Australia state, which faces a labor shortage as mining and oil producers compete for skilled workers.

The proposed deal is the second move this week by one of Australia's major mining companies to consolidate operations in the country at a time when global economic concerns have wiped billions of dollars off stock exchange values and driven prices for industrial commodities and oil lower. Rio Tinto PLC (RIO), together with partner Mitsubishi Corp. (8058.TO), said Monday that it has offered about $1.55 billion for the minority of shares currently not owned to take coal producer Coal & Allied Industries Ltd. (CNA.AU) private.

BHP said it has signed a preliminary agreement to buy the HWE Mining subsidiary of Leighton Holdings Ltd. (LEI.AU) in a deal it expects to close in the final quarter of the year, subject to due diligence and regulatory approvals.

Leighton separately said the business, which services three of BHP's operations in the iron ore-rich Pilbara, account for about A$1.1 billion in annual revenue and A$1.4 billion of work in hand. Leighton bought HWE Mining out of administration in 2006.

Leighton Chief Executive David Stewart said the company is in the process of tendering for new mining contracts in Western Australia and sees opportunities for work in Mongolia, southern Africa and Southeast Asia that will maintain the company's position as one of the world's largest contract miners.

-By Robb M. Stewart, Dow Jones Newswires; +61 3 9292 2094; robb.stewart@dowjones.com

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