RE: mineral in the ground
lemond, I want you to do me favor...compare the nutrient list in the 30/06 with the big brown blocks. With the exception of some of the micronutrients (whose value is suspect anyway), I think you'll find they are essentailly the same at a quarter (or more) of the cost. The two foot hole can be achieved by crushing the brown blocks as this increases the soluability of the salt and gets it mixed with soil more readily. Once mixed with the soil, the deer have to uptake the dirt to get the "salt". I have found in DE (coastal plain), there are places the salt will not be visited. In these cases I use a horse sweet feed that has molassis as a binding additive. After they try it, seems they get addicted quick!!
Another tip, nows the time to plant that clover! (I use pre-inacculated, white clover mixed with equal amounts of crimson) Do it during or after a snow and the melting action will work the seed into the ground. In the spring, the seed will germinate and out compete some (not all) of the "weeds" Fertilize with 0-10-10 (do not use any nitrogen!!!!), and the boost will really jump the clover!!!
One last hint, put two pales of straw ($3.00 a pop) about a foot apart with your salt hole in the middle. Bucks horns will stick in the bales. If the are ready to drop, you'll be left with a cool prize for your efforts!!
Good luck!!