Cast booster using novel explosive core

An explosive device comprising:

• a blasting cap and an explosive core having a substantially cup-shaped aperture with internal dimensions for receiving the blasting cap having external dimensions for initiating an explosion of said explosive booster
• wherein the internal dimensions of the cup shaped aperture are sized to the external dimensions of the blasting cap within the cup-shaped aperture of the explosive core;
• and
• the cup-shaped aperture of the explosive core in direct contact with the blasting cap and no barrier between the cup-shaped aperture of the explosive core and the blasting cap.

An explosive device for initiating a relatively insensitive main explosive charge comprising:

• a booster with main booster housing;
• an explosive core containing an explosive composition that is the most explosive composition of the booster, the explosive composition being sensitive to initiation by a blasting cap or detonating cord;
• the explosive core having a top surface, side surface and bottom surface and at least one initiation aperture;
• the at least one initiation aperture having a cup shape with an interior side wall and an interior bottom wall,
• the side wall and bottom wall of the at least one initiation aperture are exposed surfaces of the explosive composition of the explosive core;
• and
• the explosive core having a cup bottom thickness measured from the bottom wall of the at least one initiation aperture having a cup shape to the bottom surface of the explosive core;
• the at least one initiation aperture having a cup shape for physically coupling a blasting cap to the explosive core with the explosive core containing the most sensitive explosive of the booster;
• a sheath explosive that covers the explosive core at least partially on the side surface, bottom surface and top surface wherein the sheath explosive is comprised of a melt cast-able explosive composition;
• a blasting cap positioned within the initiation aperture in direct contact with the exposed surface of the explosive composition of the explosive core;
• and
• no barrier between the blasting cap and the initiation aperture.