2 ms·

This 1976 SciAm article has a lot of info including photos of the mine: https://www.jstor.org/stable/24950391?seq=1 https://www.jstor.org/stable/24950391?seq=1

• fransje26 2y ago
  Would there be a way to share the article for those without access to jstor?
  • krunck 2y ago
    Not that I know of. Sorry. I forgot my uni gives my IP free access.