Gold Farming

Today in the class, someone mentioned a very interesting case about how an scientist successfully recovers gold nanoparticles and mercury from agricultural crops. Not only this process is commercially viable, but it also improves the quality of soil that is often left contaminated with toxic chemicals used during mining.
I wonder if it would make sense to use these process over Kolar and other abandoned indian gold fields.
A detailed pdf elaborating the technicals of the process could be found here

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