That is SE-30 mineral salt with Selenium. Talked to a biologist in Idaho a few years ago, they have a program over there where they put it out for the elk. They also used to seed the Clokum herd with it a few years back. We put it out in 6 differnts spots in about a mile radius in July. They stomp it in the ground pretty good and they hit it as soon as the snow melts in the spring.