From Wiki, among other articles on Asteroid mining Some who want to mine Asteroids have said some passing Earth have more Platinum in them, then has been mined in all of the history of Earth. Others have large quantities of Gold. People have told me Gold is the most stable investment as there is only a finite amount on the planet. In 15 years, on good Asteroid could turn that all on it's ear, is anyone heavily invested in Gold worried? Just curious. Billionaires could be mining Asteroids in 10 years Gold and Platinum in Asteroids MIT Simple case study $2.6 billion dollar invest in capturing a 30 meter long 500 ton asteroid which could yield $30-50 billion in return. However their timeline puts it at 2035-2045 before we'd be full time asteroid miners.