Shire Silver Solutions

Is anyone here into silver recovery? Silver can be extracted from industrial byproducts using machines like this:

http://www.rotexsilver.com/ultra.htm

It's not clear whether the amount of silver recovered would be enough to cover the health costs of handling the nasty chemicals.

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"No state shall...make anything but gold and silver coin a tender in payment of debts". US Constitution, Article I, Section 10, Clause 1.