By Gillian Tan and David Winning 
 

SYDNEY--KKR & Co. LP (KKR) is weighing a bid for Rio Tinto PLC's (RIO) majority stake in an Australian copper-gold mine, people familiar with the matter said Monday, in a sign that private equity firms are hunting for bargains among assets no longer wanted by major resources companies.

The move is unusual for KKR which has placed only a few bets on resources in the past, preferring to invest in sectors such as healthcare, financial services and retail. Most of its earlier resources deals were focused on the U.S. energy sector, especially shale gas producers, or companies generating renewable electricity.

KKR is examining Rio Tinto's 80% stake in the Northparkes copper-gold mine in Australia's New South Wales state ahead of a deadline in mid-May for initial bids, the people said. It isn't known if KKR has hired an investment bank to review an offer, but the private equity firm counts former Rio Tinto Chief Executive Leigh Clifford as a senior adviser to its board.

Rio Tinto hired Macquarie Group to find a buyer for its stake in Northparkes, The Wall Street Journal reported earlier this month, citing people familiar with the matter. Units of Japan's Sumitomo Group own the remaining 20% interest in the mine.

KKR declined to comment. Rio Tinto didn't respond to requests for comment.

Northparkes is among several assets that Rio Tinto put up for sale as it focuses on cutting costs and bolstering its balance sheet under the stewardship of Sam Walsh, who took over as chief executive in January. Rio Tinto hasn't confirmed Northparkes is for sale, although it has several other assets on the block, including its diamonds unit and the Pacific Aluminium division that houses about a dozen aluminum assets.

Analysts at Commonwealth Bank of Australia late last month said Rio Tinto had the potential to realize US$13.5 billion from asset sales and selling its 80% stake in Northparkes could raise as much as US$1 billion.

Rio Tinto acquired Northparkes as part of the 3.5 billion Australian dollar (US$3.6 billion) acquisition of North Ltd. in 2000, outbidding Anglo American PLC (AAL.LN). The mine exports most of the copper concentrate it produces to customers in Japan, China and India. According to Rio Tinto, extensions to the mine since it began production in 1994 have extended its expected life to 2024.

Buyout firms like KKR have traditionally shied away from investing in mines directly as they lack the expertise to handle mining operations that are often technically challenging and exposed to volatility in metals prices. Lenders are also cautious about providing private equity firms with large amounts of debt for resources deals, given their track record of success is less proven than in other sectors.

KKR tapped investors for US$1.2 billion for its Natural Resources Fund in 2010, which was its first dedicated fund targeting the commodities sector, according to the company's annual report published in February. The fund is targeting investments in "natural resources assets, such as oil and natural gas properties" that are deemed non-core by their sellers, the report said. About one-third of the fund has been invested so far.

Another US$1 billion has been committed by investors toward resources deals, but this money doesn't sit in a single fund, the annual report said. Some of KKR's other vehicles, including KKR Financial Holdings LLC (KFN), can also invest in natural resources.

-Write to Gillian Tan at gillian.tan@wsj.com and David Winning at david.winning@wsj.com

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