National Geographic : 1941 Jun
Photograph by Kenneth Rogers From a Granite Ledge Near Lithonia, Georgia, 69,360 Tons of Rock Were Blasted Off inOne Shot Du Pont "Nitramon" blasting agent, which contains paraffin, among other things, was used in this quarry shot. Todislodge thehuge granite mass, 14holes were drilled, ranging in depth from 108 to 131 feet, about 32 feet apart, and 15 feet back from the cliff's edge. Then 19,266 pounds ofNitramon, packed intin cans two feet long, were put down into these holes and fired simultaneously. So, for each pound of blasting agent, 3.6tons ofrock were blown off(page 747).