NEW YORK (TheStreet) -- Shares of Cliffs Natural Resources are up 8.76% to $11.42 after it was reported that Nucor Corp. is in talks to invest in Cliffs's Bloom Lake iron ore mine in Canada, sources told the Wall Street Journal. Two Japanese steel companies would also be part of the venture, which would allow Cliffs to more than double production at the mine in Quebec to 13.5 million tons a year.