MONTCOAL, W.Va. -- Rescue teams had to turn back early today in their third attempt to find four missing miners at Massey Energy's Upper Big Branch Mine, after they encountered a large amount of smoke from a fire near the mine's longwall section. The teams found one refuge chamber in the mine that had not been used, but could not reach a second chamber. They will not be able to get to the second refuge chamber within 96 hours of Monday's explosion - the amount of time the chambers are supposed to keep people alive. That would be about 3...