Setonian, it's iron oxide, not the metal (like gold). It's like rust stains you get in sinks from high iron in water. So it needs to be dissolved, maybe with a chelant (EDTA) in water and "washed" out with fresh water. Then you have to worry about disposal of the effluent, the whole process just adds cost to the final clay product. Far cry from the CEO loading up his pickup and making a delivery.
the iron in the clay is most likely if a feric or ferrous oxide form which means it does not have a sufficient weight differential to be separated from clay by a purely mechanical means such as the kds. the types of precious metals that the kds was geared towards were found in particulate form which allowed them to gather at the bottom of the device while lighter materials were blown away.
the tactic of bringing up a 5 yr old failed project and trying to tie it to a currently successful one by mirepresenting the comparison is weak.....but typical of someone trying to divert the discussion with red herrings.
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