Our Green Desert Calcium Bentonite comes out of a deposit in the Mojave Desert, just outside Death Valley National Park. It is hand selected from the pure vein, sun dried, and milled to +325 mesh. It is not chemically processed, heat treated, or cleaned in any way, because it does not need to be. It comes out of the ground that clean. We own the deposit and we own the refinery. Every batch traces back to a specific place in the desert, and when you ask us a question about it, you are talking to the people who took it out of the ground.