The Globe and Mail reports in its Friday, May 12, edition that unnamed sources say the Canada Pension Plan Investment Board, the country's biggest public pension fund, is considering a bid for Dominion Diamond ($17.57 (Canadian)) and is studying the miner's books. A Reuters dispatch to The Globe reports that the move comes after Dominion, the world's third-largest diamond producer by market value, put itself up for sale in late March, following an unsolicited $1.1-billion (U.S.) approach from American billionaire Dennis Washington. Shares of Dominion rose as much as 6.1 per cent in Toronto trading and as much as 8.1 per cent in New York. CPPIB and Dominion both declined to comment. It is unlikely that CPPIB will make an offer for Dominion on its own, and if CPPIB decides to proceed with a bid, it may financially back a partner with mine-operation expertise, sources say. CPPIB is one of more than five parties that have signed an agreement with Dominion to get access to its confidential data, says one source. There is no certainty that CPPIB will submit a bid, sources say.