They had two fuses each....one being Infared Thermal and the other a radar fuse adapted from the BOMARC Missile.
Project 1559, also known as Carolina Moon, AFATL's Technology Branch designed mine with a 6-foot diameter and an approximate weight of 4,000 pounds, of which half was explosive in a focused warhead. The waepon would be dropped from either a C-123 or C-130 aircraft and would feature 2 64-foot parachutes to retard its fall. The mine would have two fuzes. One of these was modified from that used on the CIM-10 BOMARC surface to air missile. The other was an infrared optical fuze. The radar fuze had a cone of 70 degrees, while the optical fuze had a cone of 3 degrees.