THE INJURED WAS WORKING ON FENCE WHEN THE BLASTING OCCURRED. SPOIL PILE WAS BLOCKING THE VIEW TO HIGHWALL SHOT AREA. HE WAS NOT INFORMED BY BLOCKERS OR SHOOTERS FOR CLEARING THE BLASTING AREA. THE BLASTING WARNING SIGNAL WAS NOT HEARD. THE LOAD BLASTING NOISE CAUSED IMPACT ON HEAD AND STARTED ACHING THE FOLLOWING NEXT DAY.