The crude oil spill on the Keystone pipeline in South Dakota will take months to clean up, a state official said on Friday, just days before Nebraska was due to decide on another pipeline project by the owner, TransCanada Corp. Canadian heavy crude prices and TransCanada Corp shares slid on Friday, the day after the 5,000 barrel spill, tied for this year’s largest pipeline leak in the United States. No date has been set for reopening Keystone, TransCanada said, adding that a media report that had stated a restart date was incorrect. The spill gave further ammunition to environmental groups and other U.S. opponents of another pipeline the company has proposed, the long-delayed Keystone XL. Keystone carries 590,000 barrels per day (bpd) […]