No flame intended Idaho,
If the Truth be known,
Most County Quarries and a lot of State Highway Projects are exempt from what some consider good security, on such sites, where explosives are used.
In such places,
And yes, They are very well protected behind a chain link fence (maybe?), with a pad lock on the main gate,
(sometimes the gate was just an 3/8ths steel cable hung between two old telephone poles with the lock on one end?)
And of course there was another pad lock (Quality not great) on the Plywood door of the storage shed.
Our County Quarry was ripped off twice in 10 years. Once in the Mid 80's, again in 91'.
But as to private citizens,
If your into Commercial Grade Fireworks, the stuff you have to do to store them is costly.
And at the Local Private quarries, all explosives have to be stored in a metal building or container, within its own chain link area.
One quarry that was local to us had to have three containers, one for each type of explosive stored.
They had live security cameras on all three, that were monitored 24/7. The Locks on each were very hard to defeat.
As for the Electronic Detonators, they were stored separately from all, and kept in a heavy steel safe bolted to the frame in the back of the bosses pickup.
I hauled a lot of rock from there and got to know the owners, good hard working people.
The quarry had a quality 400 meter range on one side and I used it a lot, with permission of course.
Rhodie