S14/E28 Iron question


I know this is way out of date, but seems like a massive error/misstatement in the show.

The guy at the Minnesota mine was talking about the two main ores of Iron...Hematite and Magenetite. And the point he clearly made was that Hematite is 65% iron and Magnetite was 20% iron..and furthermore that the Hematite was used up in WWI...which is why they mine magnetite.

But after doing research, there is plenty of Hematite left on the planet and its the main ore...magnetite has similar iron content but is slightly different in make-up.

So what is true? Was he just talking about a single mine in Minnesota?

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