iodine cobalt blocks and smash them with a sledge hammer......10 or these will cost you about 50 bucks..............spring run off will spread it out a bit and it will remain active for a few years.....if you can get them out before the snow, that's better as the thaw/freeze will slow release the salt into the ground......if youcan dig a 1ft deep trench and place them in that, it will work better. I have a "Whitetail Institute" feed area on my farm and the mineral/salt lick accompanied by some clover makes a great deer area.