At 5:15 the CO detector at #4 belt head went off, the belt was shut down. Two workers were close by & responded to the area. Discovered smoke, called outside & reported findings. All men were evacuated via the intake. After smoke was cleared & further investigating, a rock was found in the tail with coal causing a spillage & the belt to run off in tail piece causing heat & smoke.
U.S. Mine Safety and Health Administration