TORONTO--Canada's two largest pension funds are sounding out big investment firms to partner on potential, separate bids to acquire the Canadian iron-ore assets of global mining giant Rio Tinto PLC (RIO, RIO.LN), according to people familiar with the matter.

CPP Investment Board and Caisse de depot et placement du Quebec are both seeking potential partners for their own possible bids for Rio Tinto's 59% stake in Iron Ore Co. of Canada. Analysts have estimated the stake is worth around $4 billion, valuing the entire business at around $7 billion.

Amid falling commodity prices, miners have been rushing to sell assets as they look to manage large debt loads and investors' complaints of low returns. With many would-be strategic buyers of the Canadian iron-ore business sidetracked with their own efforts to shed assets, big institutional investors and private equity shops are now showing interest.

CPPIB is working with U.S. private-equity firm Apollo Global Management LLC and looking for other partners, according to people familiar with the matter. Meanwhile, Caisse de depot has held discussions with possible partners for its own pursuit of the assets, these people said.

Private-equity giant Blackstone Group LP (BX) has also expressed an interest in the asset, according to people familiar with the matter. At least two miners have also eyed IOC. State-controlled

China Minmetals Corp. said last month it's considering making a bid, perhaps with a partner. Commodities giant Glencore Xtrata PLC (GLNCY) has also looked at the assets, according to people familiar with the matter.

Canada's pension funds have typically focused their big investments on infrastructure and real estate. These holdings offer steady returns that match up well with the liabilities of their pensioners and often perform well during periods of economic turbulence.

But increasingly, these investors are showing more interest in the resource sector as a way to diversify, hedge against rising inflation risk and in some instances generate significant capital gains. Toronto-based CPPIB is Canada's largest pension fund with about 183.3 billion Canadian dollars ($174.2 billion) under management, followed by Quebec's Caisse de depot, which oversees about C$176.2 billion.

CPPIB generated a large gain from its investment in Progress Energy Resources Corp. after Malaysia's Petroliam Nasional Bhd. acquired the Calgary, Alberta, energy company last year. Both Caisse de depot and Ontario Teachers' Pension Plan, another big Canadian pension fund, have recently formed natural-resources investment teams to focus on potential deals in the commodities sector.

Despite falling iron-ore prices, the Canadian funds and private-equity houses are attracted to IOC because it comes with infrastructure such as a rail line and a Quebec port, according to people familiar with the matter. A second round of indicative bids for the IOC assets is expected next week, according to one of these people.

Rio Tinto, which relies on iron ore for four-fifths of its earnings, has been under pressure to increase returns for investors and reduce its debt to safeguard against further declines in iron-ore prices. Though still higher than last September's multiyear lows, iron ore slumped to a seven-month low in May and prices remain volatile, amid a glut of supply and fear of a slowdown in China.

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