Laserfiche WebLink
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 />