I will once again be odd man out here. I have Crystalyx Mineralyx barrels out year around.  Worth every penny in a cow/calf operation imho. I also put out cheap white salt blocks in trays near the waterers.

Right now I can show you some pics of some popular local mineral I put out in the blue feeders with flap as an ongoing experiment. Untouched rocks. Cheap mineral is not cheap if it is not consumed.