Beijing: At least seven miners who were trapped since Monday in an underground warehouse of a coal mine in north China’s Shanxi Province were confirmed dead, according to local authorities on Friday. The coal pile in the warehouse collapsed at midnight on Monday when miners were repairing a coal feeder.Beijing: At least seven miners who were trapped since Monday in an underground warehouse of a coal mine in north China’s Shanxi Province were confirmed dead, according to local authorities on Friday. The coal pile in the warehouse collapsed at midnight on Monday when miners were repairing a coal feeder.