A mineral lick should be available for the wildlife year round. A 50/50 mixture of loose trace mineral salt and Di-Cal works fine and is cheap. About $17 will make enough for two lick sites. Pick a clay type soil, dig a hole about a little less than a foot deep and 3 or so feet wide, pour your mixture in the hole, add a little dirt and dig it in. Just add about 50 or so pounds per year to the hole. If they use it a lot, add it twice a year. A good lick will eventually be as big as the back end of your pickup.