Last cache of dynamite I recall was in a residential garage, about 1975. Homeowner was about 80 years old, spent much of his life prospecting in the Colorado mountains. When he went to the nursing home his sons found a nearly full case of DuPont 80% High Velocity Dynamite sitting on the upper shelf of the detached garage. Nitroglycerine had seeped out, running down the shelves and wall, soaked a work bench, and pooled on the floor. Four wooden boxes of electric blasting caps were sitting on top of the dynamite case.
A US Army EOD Team responded to the scene, spent all day with hand sprayers loaded with acetone to soak up the crystallized nitro residue, cut out saturated shelves and the workbench, hauled everything off to be burned in a controlled area.
Meanwhile, I spent my entire shift plus several hours coordinating the evacuation of a one-block radius all around, while making absolutely sure there was no use of radios or other electronics anywhere near the property.
TNT, C4, C2, ANFO, old hand grenades, artillery shells, and mortar rounds are much less trouble to deal with than dynamite that has been sitting around for a few decades.
