EMPLOYEE WAS INJURED WHILE HANGING 4160 CABLE. AFTER CABLE WAS SUPPORTED ON HANGER (FROM ROOFBOLT PLATE) AND HIGH LIFT BASKET LOWERED APPROX.1-2FEET, 2 PIECES OF SALT (APPROX. 29"" LONG X 20""WI DE 2 0-3 THICK) FELL AND STRUCK HIM, HITTING HARD HAT FIRST.