my understanding is that all those supplements can be bought at the feed store for a lot less $$ than buying the bag with a pic of a deer on it. You just need a recipe like the one Joel has. I think you could also just read the bag of deer stuff, ingredients should be on there.
farmer quality red trace mineral salt has molasses in it to entice the cows to eat it. I have used it for deer by just digging a hole mixing it with the dirt. The deer had the hole enlarged to an area about 4' in diameter.
I really don't remember, I used it during the middle 80's, mostly as an attractant. It did work very well for that purpose. I'm sure it had sodium, calcium, magnesium but for the rest I can't say. The molassses made it very sweet. It was cheap back then, 3-4 dollars for 50 lb. I think if it was mixed with today's nutrient rich products you could streach the cost out pretty well, and the deer would tear it up.