INJURED WAS BENT OVER NEAR THE GROUND WHEN SOME CAP ROCK FELL NEAR LAST ROW OF BOLTS AND CAUSED THE VENTILATION TUBING TO FALL AND STRIKE INJURED ON THE HARD HAT. NO REPORTABLE TREATMENT RENDE RED UNTIL 6-18-01. (INJURY BECAME REPORTABLE ON 6-18-01 WHEN PHYSICAL THERAPY STARTED).