That was interesting stuff, I was disappointed with his results until he did the gpt calculations and it showed 6.7 gpt, that's high grade lol.
I bought two catalytic converters last year for the same crappy car lol, so I'd say the best place by far for this insane mining idea would be Ca because the smog laws here make you buy so many catalytic converters to pass the smog. The first one I bought and had installed for $600 failed right off the bat, probably blowing the material all over the freeway:) so there probably more platinum on the freeways out here than other states. Personally this technique isn't for me; too many chemicals, fire, cars to get hit by or other ways I'd get hurt but I enjoyed the video, he's definitely a smart guy when it comes to the science and metallurgy.