What can we do with a captured asteroid?

There's gold in them — literally 

Asteroids have more than enough gold, plus other metals, to provide a few lifetimes' worth of fortunes. But there are plenty of other reasons asteroids are valuable. So how do we get these metals from these faraway asteroids? Perhaps the best way is to bring the space rocks to Earth. Most of the metals we use in our everyday lives are buried deep within Earth. And I mean deep: When our planet was still molten, almost all of the heavy metals sank to the core, which is pretty hard to get to. The accessible veins of gold, zinc, platinum and other valuable metals instead came from later asteroid impacts on Earth's surface. Those asteroids are the fragmented remains of almost-planets, but they contain all of the same mixtures of elements as their larger planetary cousins. And you don't have to dig down into their cores to get it: The asteroid 16 Psyche, for example, contains roughly 22 billion billion pounds (10 billion billion kilograms) of nickel and iron, which are used in everything from reinforced concrete to mobile phones. If we maintained our current consumption of nickel and iron, 16 Psyche alone could supply our industrial needs for several million years. Read more...

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