MSHA record for Mason No 7 (mine ID 1515169). Fatalities, non-fatal incidents grouped by year, current operator and controller, and mine context.
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UNINTENTIONAL ROOF FALL OCCURED AT THE 7TH CROSSCUT OUTBY THE 002 SECTION. THE FALL FELL ABOVE THE ANCHOR. AREA OF THE FALLW AS 20'X70'X5' THICK. FROM THE #3 BELT ENTRY AND THROUGH THE CROS S CUT AND ACROSS THE #4 RETURN AIR COURSE.
EE WAS RUNNING A WILCOX J-6 ROOF BOLTING MACHINE W/ATRS BOLTING IN SEQUENCE FROM LEFT TO RIGHT; BOLTS ARE NUMBERED 1-4, WHEN PREPARING TO INSTALL BOLT #4 IN SEQUENCE, A PIECE OF DRAW ROCK FELL BETWEEN BOLT #3 AND THE RIB WHERE BOLT #4 WOULD BE INSTALLED, THE ENTRY WIDTH IS 20'.
INJURED WAS WORKING AT THE FACE OF TH EMINE AS MIENR HELPER AND WAS IN THE PROCESS OF HANGING A VENTILATION CURTAIN. E HADN'T NOTICED A LOOSE PIECE OF ROCK BETWEEN THE RIB AND THE FIRST ROW O F ROOF BOLTS, WHIHC FELL ONTO HIS BACK AS HE WAS WIRING THE CURTAIN TO A ROOF PLATE.
STRAINED HIMSELF BUY LIFTING AN UNKNOWN OBJECT. THIS REPORT REPLACEDS THE PREVIOUS ONE FOR THE SAME EE INCORRECT MSHA ID WAS REPORTED.