As I remember, the autobiographies of Philip Tome and Meshack Browning both contain some mention of using salt licks in regards to deer hunting. Both are in print. The former is available free online. I also think Daniel Boone's biographies mention Big Bone Lick in Kentucky. The park at Big Bone Lick would probably be able to point your student in good direction. It is a natural lick that has been drawing game for probably 10,000 years or more.
Here's a good resource on making licks:
One problem: now is not the best time to be working with mineral licks. The deer are on the tail end of their interest in salt. Usually salt becomes an all-consuming craving for deer beginning in March, hits a peak in June-July and starts to taper off in August. This coincides with both the doe's lactation requirements and the buck's antler growth. Now that we're getting into Fall, the deer are visiting the licks less and less.