I stopped using mineral rocks awhile back because of bears. But not because they were stealing my mineral rocks, but because they would mess with my camera I had in front of the mineral rocks. They are a curious animal, and when they find this cool round shaped toy rock that tastes kinda yummy, they roll around next to it, lay on it, and just hang out by it. That gives them ample time to find new things to mess with that they see, like my cameras, or climb in my deer stand and bend shit. Now I try to avoid stuff that attracts bear, including my choice in what is in my food plots.