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MISFIRE PROCEDURE <br /> A misfire is the complete or partial failure of a blast hole to detonate as planned. With <br /> advancements in product quality and blast technology, misfires rarely happen, however in the event of <br /> a misfire the lead blaster will: <br /> • Not release the immediate blast area for return to work. <br /> • Wait 30 minutes before completing a more thorough investigation of the cause of the misfire. <br /> o Depending on the location of the blast, the lead blaster, at his discretion, can release <br /> areas not in the immediate area of the blast while waiting the required 30 minutes. <br /> This may include the access corridor and other facilities on the site. <br /> • If the investigation reveals the detonator can be re-used and re-shot, the blast area will be <br /> cleared again, blast guards reestablished, and the blast warning procedure will be reinitiated, <br /> and the detonator blasted. <br /> • If the detonator cannot be re-used and blasted,the area will be secured, and all mining <br /> personnel warned of the hazard.The area will be carefully excavated under the supervision <br /> of the lead blaster or quarry manager until the blasting cap and booster are located. <br /> FLYROCK CONTROL PLAN <br /> Flyrock is defined as dirt, mud, stone, or fragmented rock that is propelled from the <br /> blasting area by the force of the blast. Flyrock is never expected in a blast, but due to the <br /> nature of explosives it can happen. Flyrock can be minimized and eliminated by following the <br /> basic blasting guidelines below. Summit Brick Company adheres to these guidelines for all <br /> blasting completed onsite. <br /> • Proper blast pattern design including proper burden and spacing based on hole <br /> size and by ensuring there is adequate space in front of the pattern to allow <br /> fractured material to move horizontally. <br /> • Proper blast hole loading, ensuring hole quality is adequate and explosive column <br /> height and stemming material heights meet calculated requirements for safety. <br /> • Setting up blast patterns so that the direction of the blast will be away from <br /> permanent manmade structures, and away from adjacent permit boundaries. <br /> • Using appropriate blast pattern timing sequences so the pattern is shot <br /> systematically and in proper order. <br /> 6 <br />