Glencore Xstrata (GLCNF.PK) and Blackstone (BX) may bid for Rio Tinto's (RIO) 59% stake in Iron Ore of Canada, sources tell WSJ. RIO put the position up for sale earlier this year. Some say Blackstone is the more likely suitor given that Glencore is still busy integrating Xstrata. The Journal notes that mining companies are becoming "more cautious on bidding for new assets [as] investors demand restraint on spending [amid] falling commodity prices" (previous). Bankers say this has opened the door for private-equity.