From their listing: At Redmond Agriculture, we understand that when your animals feel good, you feel good. That's why we offer our Goat Mineral Mix-a premium sea salt with naturally occurring essential trace minerals. This mix is also fortified with selenium (30 ppm), manganese, cobalt, copper, iodine, zinc and vitamins A, D and E. The salt in our Goat Mineral Mix is free of chemical processing, preferred by livestock, and helps animals maintain a normal function. It is stocked in 5 lb and 25 lb bags.
Redmond Goat Mineral Mix's granules are the perfect size for mixing or feeding free choice.
Why wouldn't this be a mineral?
I don't use it but I do have one of their rocks and that's definitely a salt.
It also says Wal-mart carries it (?)