it's not so uncommon, really. you can find a lot of copper, nickel and iron rich soils where i live plus there's also bauxite (aluminum) and lots of chromites too and those are usually hard to process in some instruments so this is ideal for them at times
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Ah ok, I was more thinking about precious metals.
well when it's precious metals, there are already effective methods for those, otherwise this method is for common and industrial metals
Thanks for clarifying 👍🏻