(August 6, 2011 at 10:02 pm)wbegg Wrote: 5000 metres? (meters for us US kids) ??
Might as well spend that money to extract a bit of H3 from the Moon!
Rare Earth minerals are not "rare". Otherwise, we'd be recycling speakers and magnets.
It's still much easier to siphon up mud from 5000m underwater than going into earth orbit. Technology to do this was not only possible but implemented in the 1970s, when there was interest in recovering magnesium concretion nodules from the abyssal plains