I used to be able to find turquoise at the copper queen mine in bizbee arizona. The tailing piles there had all kinds of different minerals in them. Probably toxins as well.
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I'm not surprised, the southwest has a lot of turquoise in it's mineral formations.
There are a couple of copper mines up here that contain arsenic in the tailings piles. I don't remember the mineral it comes from, but it's not found in any quantity in most of the tailings piles, just a few of the mines.