From: Bill Lucy 

Out of darkness, Geo. says...

> > not that, maybe some of the chemical composition of some of those
> materials.
>
> I've never worked in the industry but I know when they drill oil wells
> around here they don't seem to be concerned about getting covered from head
> to toe in whatever comes out of the hole.

Neither did coal miners for a long time.

I can imagine that arsenic and hydrogen sulfide would be two naturally occurring
substances in that muck.

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