At the diotamacious earth pits up on the hill east of vantage. In the tons, and ton of opal most of which was junk, you could find a very nice seam of agate. The seam in the earth would go from opal to agate (if you were lucky) to diatamacious earth (love that fluffy white crap) It was a little more difficult to find , but when I did I collected about a ton of the stuff, they buried where I was collecting....what a bummer!! The new pit futher west doesn't have jack!!!