flyrock flyrock is the propelling rock from the blast area. leading cause of fatalities and...

FLYROCKFLYROCKFlyrock is the propelling rock from the blast area.

Leading cause of fatalities and equipment damage

CORRECTION OF IDENTIFIED CAUSES CAN SOLVE FLYROCK PROBLEMS

FLYROCKS OCCUR WHERE ENERGY IS VENTED INTO ATMOSPHERE AND PROPELS ROCKS

WHERE BURDEN AND STEMMING IS TOO SMALL OR HOLES ARE INITIATED OUT OF SEQUENCE

DRILLING INACCURACY

OVERCHARGING

GEOLOGICAL CONDITIONS

SYMPATHETIC DETONATION

COLLARING TOO NEAR TOP OF THE FACE IN HIGH BENCH OR HIGHLY INCLINED FACE

LARGE BURDEN & TOP PRIMING CAUSES FLYROCK

GEOLOGICAL CONDITIONS

Open joints, mud seams and cavities may result in escape of gases and also blasting nuisances.

DRILLING INACCURACY CAUSES INSUFFICIENT BURDEN RESULTING IN

FLYROCK

REMOVAL OF TOE USING SHORTHOLES CAN CAUSE EXCESSIVE FLYROCK

FAULTY DELAY TIMING AND INITIATION SEQUENCE

Re-enactment of where the operator's body was found after the accident

MEASURES TO CONTROL FLYROCK DAMAGE

1. Proper blast design

2. Bench height, borehole diameter, hole

inclination, burden and spacing, charge

distribution in holes, stemming, initiation

sequence and timing

3. Site control during blasting

4. More experienced drilling/blasting crew

5. More effective communication

6. Covering

7. Miscellaneous measures loose stone, toe

holes

COVERING WITH WIRE NET

PROPER STEMMING TO CONTROL FLYROCK