I partially disagree. I know the basic high level concept of all those. Would I be able to reproduce state of the art results on my own? Obviously not.

But a core part of the engineer or scientist mindset is curiosity for the sake of curiosity. Just the fact that I don't know something is enough reason for me to poke at it or otherwise learn more. Same reason I still take apart broken electronics as an adult and try to find the fault (and sometimes even repair it).

By the way, mining silicon is particularly easy: it's basically sand. The difficult part is purifying it, especially to the levels needed for modern nm scale chips.

A more useful question than making high end silicon would be: could you with reasonable tooling reproduce basic electric components? I'm talking things like light bulbs, resistors, generators, perhaps capacitors even? Just the basics crappy versions, not modern highly optimised surface mount components. And I think the anwer is yes (for me personally) if I had access to metal wire and sheet stock and industrial revolution era tools.