Cost of the Apollo pgm in today's dollars $110 billion Total weight brought back 861 lb Now that's from the moon our CLOSEST neighbor but it still cost $127,758,420/pound returned. Now multiply that by 1600 distance ratio asteroid to moon and you get $204,413,472,706 per pound transportation cost. Something the space kadets gloss over.
That’s government doing it. Planetary Resources and DSI are private companies.
You are also thinking in terms of 60’s technology. My iPhone has more computing power than all of the computers used in Apollo combined...
And then there is this...
https://en.m.wikipedia.org/wiki/RF_resonant_cavity_thruster
Game changer...