While mining coal in the 4th lift of pillar mining in the #3 entry, an unexpected roof fall occurred pinning the continuous miner. Miner operator was using remote control to mine while being observed by a federal inspector. At the time of the fall, no visible cracks or separations had been found by the foreman or inspector prior to mining. No injuries.
Pre shift examiner made pre shift exam & returned outside without seeing any falls. Workers went to section to run coal with federal dust pumps. Fall was found when arrived on section to do safety run. Mining (pillars) in #3 entry. Fall was one crosscut outby spad 653 in pillar line between 4&5 entry. Advised by federal to call occurrence in as reportable.
While bolting inside bolt, employee rested EE's hand on drill arm. Employee intended to lower drill head and unintentionally raised drill head causing EE's right index finger to be pinched by drill arms against drill bump stop.
While making weekly airway exam a roof fall in the cross cut between #6 entry & #7 entry one break outby spad 510 was found to have fallen. Fall was reported as being from the right corner of the #6 entry through the intersection of the #7 entry approximately 6 ft from the coal rib and approximately 6-8 ft high.
EE knelt against rib in the #3 entry watching the continuous miner cable when a section of rib estimated 3' long, 1' high and 8"" thick pushed against his back. Witness came & pushed the rock off his back. Foreman was notified & victim was offered to be taken out of the mine for medical evaluation. He denied medical attention & continued to work rest of shift.
While making the weekly airway examinations with federal mine inspector, we found a rock one break inby spad #47 in the primary escapeway from breaks 16-17. All men were pulled from the mines and the fall was reported. Area has since been cribbed, dangered, and Heinzmann Jacked from breaks 15-18 in the #7 intake entry & the primary escapeway has been re-routed.
Abandoned workings stopped due to bad roof conditions. Area was long-bolted & cribbed when mined.
Stress Zone and poor roof conditions. Roof fall found by MSHA Inspector and Section Foreman.
Surface crack fall is located 20 feet inby 16 Bk to 5 feet from inby corner of 17 Bk (Spad 55) on mains. Fall was approx 70 feet long 6 feet thick on outby end, 5 feet thick on inby end, fall was a s wide as entry on bottom and 10 feet wide on top.