IGNITION COVER AND METHOD FOR FILLING BOHRLÍCHERN

摘要

Primer casing ( 1 ) comprising sleeve portion ( 5 ) and leading portion ( 5 a), wherein sleeve portion ( 5 ) includes tabs ( 6 ) to retain primer ( 11 ) and blasthole engagement means ( 2 ), and wherein leading portion ( 5 a) comprises nose cone ( 8 ). Engagement means ( 2 ) comprises an array of rigid, multiple projections that are hinged and movable between a retracted position and a blasthole engagement position. Explosive loading hose ( 13 ) locales within hose receiving sleeve ( 7 ) and can be used to push primer casing ( 1 ) into the desired location within the blasthole prior to filling the blasthole with bulk explosive. Methods of loading a blasthole comprising inserting primer ( 11 ) into primer casing ( 1 ) and positioning primer casing ( 1 ) at a desired location in a blasthole are also described and claimed.