I have mixed results using "Deer Cocaine". In SW Pennsylvania, where I live, the soils is pretty good and there are many and varied food sources among the farms and woodlots common to the area (not to mention suburban yards and gardens). Every time I've tried the minerals here, they tend to be ignored. Up north, where my camp is, the land is mostly unbroken old growth forest. When I spread minerals up there, the deer destroy them, to the point of digging a hole in the ground. I've sweetened the same spots for several years in a row there, and some of the holes the deer have created are over a foot deep. So, I think that minerals work better in places where they provide deer with nutrition that would otherwise be hard to come by, but in nutrient rich places, minerals would be less effective.
Hunting: 10% skill and 90% location.