For several years, I used this recipe, recommended by my local state wildlife biologist:
http://fw.ky.gov/Wildlife/Documents/minerallicks.pdfI would bury the material in a trench and cover it.
What I found is the deer would hit the lick, but not as hard as burying pure rock salt. It appeared they just did not like the "medicine" as much as the "candy." I finally relented and went back to straight rock salt. The licks are hammered from March until September.
